Multi-mode radio frequency link wide temperature gain compensation apparatus and method
Patent Information
- Application Number
- CN202310228410.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- Filing Date
- 2023-03-06
- Publication Date
- 2026-10-30
- Estimated Expiration
- 2043-03-06
AI Technical Summary
[0006]针对现有技术的不足，本发明提供了一种多模式射频链路宽温增益补偿装置及方法，解决了现有技术无法在不额外增加基于移相器的射频链路的硬件和核心电路尺寸的情况下通过多种模式实现射频链路宽温增益补偿的问题
[0034]本发明提供了一种多模式射频链路宽温增益补偿装置及方法。与现有技术相比，具备以下有益效果：
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Figure CN116404999B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to the fields of radio frequency integrated circuit technology and gain compensation technology, specifically to a multi-mode radio frequency link wide-temperature gain compensation device and method. Background Technology
[0002] In radio frequency systems such as radar and wireless communication, due to the physical characteristics of transistors, the gain of amplifiers in radio frequency integrated circuits decreases as temperature increases over a wide temperature range. Since transceiver links typically contain multiple circuit stages, the phenomenon of gain decreasing with temperature is particularly significant in transceiver links. Therefore, in order to ensure transceiver performance, necessary measures need to be taken to compensate for the high and low temperature fluctuations in link gain.
[0003] Currently, conventional link gain compensation methods mainly include the following two categories: The first category is to adjust the gain of the amplifier, that is, to change the gain by adjusting the equivalent transconductance of the circuit, thereby achieving gain control of the amplifier; the second category is to add an additional temperature-compensated attenuator, that is, to achieve gain control by connecting an attenuator in series in the link that changes with temperature.
[0004] However, the first method, which involves adjusting the amplifier gain, has limited effect on gain when the transistor is operating in the saturation region, as the adjustable range of the analog bias voltage is limited. Especially when the bias voltage reaches a certain value, further increases not only fail to increase gain but also lead to increased power consumption. The second method, by adding a temperature-compensated attenuator, increases the circuit size and thus manufacturing costs. Furthermore, existing methods cannot achieve and control wide-temperature gain compensation through multiple modes. Therefore, current technology cannot achieve wide-temperature gain compensation in RF links through multiple modes without increasing the size of the core circuitry based on phase shifters. Summary of the Invention
[0005] (a) Technical problems to be solved
[0006] To address the shortcomings of existing technologies, this invention provides a multi-mode RF link wide-temperature gain compensation device and method, which solves the problem that existing technologies cannot achieve RF link wide-temperature gain compensation through multiple modes without increasing the hardware and core circuit size of the phase shifter-based RF link.
[0007] (II) Technical Solution
[0008] To achieve the above objectives, the present invention provides the following technical solution:
[0009] In a first aspect, the present invention proposes a multi-mode radio frequency link wide-temperature gain compensation device, the device comprising:
[0010] Bandgap reference, temperature decoder, and phase shifter;
[0011] The bandgap reference is used to output N sets of reference voltages; wherein each set of reference voltages contains two voltages with different values;
[0012] The temperature decoder is used to select any one set of reference voltages from the N sets of reference voltages based on a preset multiple reference voltage gating method and input it into the phase shifter;
[0013] The phase shifter controls the RF link to achieve gain based on the selected reference voltage.
[0014] Preferably, the temperature decoder includes N temperature sensors, a decoding circuit, and a single-pole double-throw switch group.
[0015] Preferably, the phase shifter is a 180-degree phase shifter, specifically comprising: a first transistor, a second transistor, a third transistor, and a fourth transistor;
[0016] In this configuration, the gates of the first transistor and the fourth transistor are connected, and the gates of the second transistor and the third transistor are connected; one path of the input differential signal of the multi-mode RF link wide-temperature gain compensation device is connected to the source stages of the first transistor and the second transistor, and the other path of the input differential signal is connected to the source stages of the third transistor and the fourth transistor; the drains of the first transistor and the third transistor are connected as one output of the output differential signal, and the drains of the second transistor and the fourth transistor are connected as the other output of the output differential signal.
[0017] Preferably, the preset multiple reference voltage selection methods include: using multiple code value generation modes to control the temperature decoder to output different code values to turn on corresponding switch groups, so as to control the selection of multiple different reference voltages.
[0018] Preferably, the multiple code value generation modes include:
[0019] Mode 1: The code value output by the temperature decoder is automatically generated as the ambient temperature collected by the temperature sensor changes.
[0020] Mode 2: The code value output by the temperature decoder is input externally according to user requirements.
[0021] Preferably, the switching between mode one and mode two is achieved by using the temperature decoder control bit Mode.
[0022] Secondly, the present invention also proposes a method for wide-temperature gain compensation of a multi-mode radio frequency link, wherein the method utilizes the aforementioned apparatus to achieve wide-temperature gain compensation of the multi-mode radio frequency link, and the method includes:
[0023] The bandgap reference outputs N sets of reference voltages; each set of reference voltages contains two voltages with different values.
[0024] The temperature decoder selects any one set of reference voltages from N sets of reference voltages based on a preset multiple reference voltage selection method;
[0025] The phase shifter controls the RF link to achieve gain based on a selected set of reference voltages.
[0026] Preferably, the preset multiple reference voltage selection method includes: using multiple code value generation modes to control the temperature decoder to output different code values to turn on corresponding switch groups, so as to control multiple different reference voltage selection.
[0027] Preferably, the multiple code value generation modes include:
[0028] Mode 1: The code value output by the temperature decoder is automatically generated as the ambient temperature collected by the temperature sensor changes.
[0029] Mode 2: The code value output by the temperature decoder is input externally according to user requirements;
[0030] Furthermore, the temperature decoder control bit Mode is used to switch between Mode 1 and Mode 2.
[0031] Preferably, the phase shifter is a 180-degree phase shifter, specifically including a first transistor, a second transistor, a third transistor, and a fourth transistor;
[0032] In this configuration, the gates of the first transistor and the fourth transistor are connected, and the gates of the second transistor and the third transistor are connected; one path of the input differential signal of the multi-mode RF link wide-temperature gain compensation device is connected to the source stages of the first transistor and the second transistor, and the other path of the input differential signal is connected to the source stages of the third transistor and the fourth transistor; the drains of the first transistor and the third transistor are connected as one output of the output differential signal, and the drains of the second transistor and the fourth transistor are connected as the other output of the output differential signal.
[0033] (III) Beneficial Effects
[0034] This invention provides a multi-mode radio frequency link wide-temperature gain compensation device and method. Compared with the prior art, it has the following advantages:
[0035] 1. The multi-mode RF link wide-temperature gain compensation device of the present invention includes a bandgap reference, a temperature decoder, and a phase shifter. The bandgap reference outputs N sets of reference voltages, each containing two different values. The temperature decoder then selects any one of these N sets of reference voltages based on preset multiple reference voltage gating methods and inputs it into the phase shifter. Finally, the phase shifter controls the RF link to achieve gain based on the selected reference voltage. This invention reuses the original phase shifter and its related circuitry in the RF link. Compared to existing technologies, without increasing hardware or circuit size, it achieves wide-temperature gain compensation of the RF link through multiple modes. This not only results in more significant gain compensation and lower power consumption, but also allows for flexible switching between multiple modes according to actual needs, making the control method more flexible.
[0036] 2. This invention sets the output code value of the temperature decoder to multiple modes, thereby controlling the switching group to conduct and output the reference voltage to control the phase shifter gain. Temperature compensation can be achieved by the temperature sensor automatically controlling the code value, or the code value can be controlled by an external control power supply according to actual needs. The wide-temperature gain compensation method of the RF link is more flexible.
[0037] 3. Compared with the compensation method based on adjusting amplifier gain with temperature changes, the present invention has a more obvious gain compensation effect and lower power consumption; compared with the power control method based on attenuators, the present invention does not increase the size of the core circuit, and the other components except the phase shifter can be placed in the blank space of the layout without increasing the length of the RF channel, thus reducing the cost. Attached Figure Description
[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0039] Figure 1 This is a block diagram of the overall architecture of a multi-mode radio frequency link wide-temperature gain compensation device according to the present invention.
[0040] Figure 2 This is a diagram of the temperature decoder architecture in an embodiment of the present invention;
[0041] Figure 3 This is a circuit architecture diagram of the switch group in an embodiment of the present invention;
[0042] Figure 4 This is a schematic diagram of the phase shifter unit circuit in an embodiment of the present invention;
[0043] Figure 5This is a flowchart illustrating a multi-mode RF link wide-temperature gain compensation method in an embodiment of the present invention;
[0044] Figure 6 This is a comparison diagram showing the temperature compensation effect before and after using the method of the present invention. Detailed Implementation
[0045] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are described clearly and completely. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.
[0046] This application provides a multi-mode RF link wide-temperature gain compensation device and method, which solves the problem that the prior art cannot achieve RF link wide-temperature gain compensation through multiple modes without increasing the hardware and core circuit size of the phase shifter-based RF link, and achieves the purpose of flexibly compensating RF link wide-temperature gain through multiple methods.
[0047] The technical solution in this application is to solve the above-mentioned technical problems, and the general idea is as follows:
[0048] To flexibly achieve wide-temperature gain compensation for RF links without increasing the size of the core circuitry, this application's technical solution employs a set of reference voltages generated by a bandgap reference, whose differential value increases with temperature, inputting them to the gate of a 180-degree phase shifter. This provides bias voltages for the two differential signals of the 180-degree phase shifter, changing the gain of both signals, and then combining the two outputs, thereby achieving automatic gain increase with temperature. This technical solution can be used to compensate for gain fluctuations within a wide operating temperature range of the RF transceiver link. Furthermore, the phase shifter gate input can be controlled automatically by a temperature sensor or by an external input, achieving gain increase with temperature. Simultaneously, this technical solution overcomes the limitations of amplifier-based gain compensation methods.
[0049] To better understand the above technical solutions, the following will provide a detailed explanation of the technical solutions in conjunction with the accompanying drawings and specific implementation methods.
[0050] Example 1:
[0051] Firstly, this invention proposes a multi-mode RF link wide-temperature gain compensation device, see [link to relevant documentation]. Figure 1 The device includes:
[0052] Bandgap reference, temperature decoder, and phase shifter;
[0053] The bandgap reference is used to output N sets of reference voltages; wherein each set of reference voltages contains two voltages with different values;
[0054] The temperature decoder is used to select any one set of reference voltages from the N sets of reference voltages based on a preset multiple reference voltage gating method and input it into the phase shifter;
[0055] The phase shifter controls the RF link to achieve gain based on the selected reference voltage.
[0056] As can be seen, the multi-mode RF link wide-temperature gain compensation device in this embodiment includes a bandgap reference, a temperature decoder, and a phase shifter. The bandgap reference outputs N sets of reference voltages, each containing two different values. The temperature decoder then selects any one of these N sets of reference voltages based on preset multiple reference voltage gating methods and inputs it into the phase shifter. Finally, the phase shifter controls the RF link to achieve gain based on the selected reference voltage. This embodiment reuses the original phase shifter and its related circuitry in the RF link, achieving wide-temperature gain compensation of the RF link through multiple modes without increasing hardware or circuit size.
[0057] The following is in conjunction with the appendix Figure 1-4 The following section provides a detailed explanation of the implementation process of an embodiment of the present invention, along with an explanation of the specific hardware structure.
[0058] See Figure 1 This embodiment proposes a multi-mode RF link wide-temperature gain compensation device, which includes: a bandgap reference, a temperature decoder, and a phase shifter.
[0059] The bandgap reference outputs N sets of reference voltages (N is a positive integer and not less than 2), each set containing two voltages of different values. The temperature decoder selects any one of these N sets of reference voltages from a range of preset reference voltage selection methods and inputs it to the phase shifter. The phase shifter controls the RF link to achieve a specific gain based on the selected reference voltage. Specifically:
[0060] The bandgap reference generates and outputs N sets of reference voltages, and each set of reference voltages contains two voltages with different values. In this embodiment, the bandgap reference outputs a total of 2N reference voltages, which are divided into N sets, and each set outputs two voltages with different values.
[0061] The temperature decoder is used to select any one set of reference voltages from N sets of reference voltages generated and output by a bandgap reference, based on preset gating methods, and input it into the phase shifter. For example... Figure 2-3As shown, the temperature decoder includes N temperature sensors, a decoding circuit, and a single-pole double-throw switch group. The decoding circuit converts fewer inputs (code values generated with temperature or externally input code values) into more outputs (output code values), aiming to reduce the number of input ports. When the 2N channels and N sets of reference voltages from the bandgap reference are input to the switch group, the switch group outputs one of the N sets of reference voltages selected by the temperature decoder. Furthermore, each temperature sensor has a threshold temperature, and the threshold temperatures of the N temperature sensors are all different. When the ambient temperature exceeds the threshold temperature of a certain temperature sensor, the corresponding temperature sensor outputs a high level, which controls the corresponding switch group to conduct. In this embodiment, the N temperature sensors have N+1 output code values. Taking N=4 as an example, as the temperature increases, the temperature decoder output states are 0000, 0001, 0011, 0111, and 1111.
[0062] Furthermore, in order to achieve flexible control of temperature compensation using multiple modes, and thus to select the reference voltage using multiple methods, in this embodiment, we set the temperature decoder output code value to two modes:
[0063] Mode 1: The code value output by the temperature decoder is automatically generated as the ambient temperature collected by the temperature sensor changes. That is, the generation of the code value is directly controlled by the ambient temperature value collected by the temperature sensor, and there is only one code value at a certain specific temperature.
[0064] Mode 2: The code value output by the temperature decoder is input externally according to user needs and is independent of the output of the temperature sensor.
[0065] Since the switch group has only one set of conduction and output, the switching between mode one and mode two can be achieved by controlling the Mode bit of the temperature decoder. When switching to mode two, ti_0 to ti_n are external control signal inputs. Furthermore, the voltage values of any two reference voltages output by the switch group are different, so the two output voltage values of the switch group have exactly two states: state one: Vctrl1 is greater than Vctrl2; state two: Vctrl1 is less than Vctrl2. The selection between these two states can be controlled by the external control signal PS_ctrl.
[0066] The phase shifter controls the RF link to achieve a specific gain based on the selected reference voltage. In this embodiment, the phase shifter is a 180-degree phase shifter, with a differential signal as both input and output. For details, see [link to documentation]. Figure 4The phase shifter includes a first transistor, a second transistor, a third transistor, and a fourth transistor. The gates of the first and fourth transistors are connected, as are the gates of the second and third transistors. One path of the differential input signal is connected to the source terminals of the first and second transistors, and the other path is connected to the source terminals of the third and fourth transistors. The drains of the first and third transistors are connected as one output of the differential signal, and the drains of the second and fourth transistors are connected as the other output of the differential signal.
[0067] State 1: When the two output voltages Vctrl1 > Vctrl2 of the switching group, Vctrl1 is applied to the gates of the first and fourth transistors, and its gain increases with temperature. Conversely, Vctrl2 is applied to the gates of the second and third transistors, and its gain decreases with temperature. If the first transistor outputs VOUT1 and the third transistor outputs VOUT3, since Vctrl1 > Vctrl2, the first transistor has a greater gain than the third transistor at any temperature, resulting in VOUT1 > VOUT3. Because the phase difference between the output signals of the first and third transistors is 180 degrees, the combined output of the first and third transistors is VOUT1 - VOUT3. Since the gain of the first transistor increases with increasing temperature and the gain of the third transistor decreases with increasing temperature, the combined signal amplitude OUT_P (i.e., VOUT1-VOUT3) increases with increasing temperature. Similarly, if the output signal of the second transistor is VOUT2 and the output signal of the fourth transistor is VOUT4, since Vctrl1 > Vctrl2, the gain of the fourth transistor is greater than that of the second transistor at any temperature, thus VOUT4 > VOUT2. Since the phase difference between the output signals of the second and fourth transistors is 180 degrees, the combined output of the second and fourth transistors is VOUT4 - VOUT2. Since the gain of the fourth transistor increases with increasing temperature and the gain of the second transistor decreases with increasing temperature, the combined signal amplitude OUT_N (i.e., VOUT4-VOUT2) increases with increasing temperature. Therefore, the output differential signals OUT_P and OUT_N increase with increasing temperature.
[0068] State 2: When the two voltages Vctrl1 and Vctrl2 of the switch group output are less than Vctrl2, the differential signals OUT_P and OUT_N can be increased with the temperature. The difference from State 1 is that when VOUT1 < VOUT3, the output of OUT_P is VOUT3-VOUT1, and when VOUT4 < VOUT2, the output of OUT_P is VOUT2-VOUT4. That is, the amplitude of the differential output signal remains unchanged, but the phase is flipped by 180 degrees.
[0069] Since the reference voltage selected by the phase shifter is any one of the N sets of reference voltages generated and output by the bandgap reference, in principle, the phase shifter can control the RF link based on the selected reference voltage to achieve a specific value of gain, and the voltage difference between the two outputs of any set is different.
[0070] Example 2:
[0071] Secondly, the present invention also provides a method for wide-temperature gain compensation of a multi-mode RF link. This method utilizes the aforementioned multi-mode RF link wide-temperature gain compensation device to achieve wide-temperature gain compensation of the multi-mode RF link. See [link to relevant documentation]. Figure 5 The method includes:
[0072] S1. The bandgap reference outputs N sets of reference voltages; wherein each set of reference voltages contains two voltages with different values;
[0073] S2. The temperature decoder selects any one set of reference voltages from N sets of reference voltages based on a preset multiple reference voltage selection method;
[0074] S3, the phase shifter controls the RF link to achieve gain based on a selected set of reference voltages.
[0075] The following is in conjunction with the appendix Figure 1-5 The following details the implementation process of an embodiment of the present invention, including explanations of the specific steps S1-S3.
[0076] S1. Bandgap reference outputs N sets of reference voltages; wherein each set of reference voltages contains two voltages with different values.
[0077] The bandgap reference generates and outputs N sets of reference voltages, and each of these N sets of reference voltages contains two voltages with different values.
[0078] S2. The temperature decoder selects any one set of reference voltages from N sets of reference voltages based on a preset multiple reference voltage selection method.
[0079] The temperature decoder selects any one set of reference voltages from the N sets of reference voltages generated and output by the bandgap reference based on a preset multiple reference voltage gating method and inputs it into the phase shifter.
[0080] Among them, the preset multiple reference voltage gating methods include: setting the temperature decoder output code value to two modes:
[0081] Mode 1: The code value output by the temperature decoder is automatically generated as the ambient temperature collected by the temperature sensor changes. That is, the generation of the code value is directly controlled by the ambient temperature value collected by the temperature sensor, and there is only one code value at a certain specific temperature.
[0082] Mode 2: The code value output by the temperature decoder is input externally according to user needs and is independent of the output of the temperature sensor.
[0083] The multi-mode RF link wide-temperature gain compensation method proposed in this embodiment utilizes two modes, Mode 1 and Mode 2, to flexibly control temperature compensation, thereby enabling the selection of the reference voltage in multiple ways.
[0084] In this embodiment, such as Figure 2-3 As shown, the temperature decoder includes N temperature sensors, a decoding circuit, and a single-pole double-throw switch group. Each temperature sensor has a threshold temperature, and the threshold voltages of the N temperature sensors are all different. When the ambient temperature at which the circuit operates exceeds the threshold temperature set by the temperature sensor, the temperature sensor outputs a high level, which controls the corresponding switch group to conduct. In this embodiment, the N temperature sensors have N+1 output code values. Taking N=4 as an example, as the temperature increases, the temperature decoder outputs 0000, 0001, 0011, 0111, and 1111. When the 2N channels and N sets of reference voltages from the bandgap reference are input to the switch group, the switch group selects one of the N sets of reference voltages and outputs it.
[0085] Since the switch group has only one set of conduction and output, the switching between Mode 1 and Mode 2 can be achieved through the Mode control bit of the temperature decoder. When switching to Mode 2, ti_0 to ti_n are external control signal inputs. Furthermore, the voltage values of any two reference voltages output by the switch group are different, so the two output voltage values of the switch group have two states: State 1: Vctrl1 is greater than Vctrl2; State 2: Vctrl1 is less than Vctrl2. The selection between these two states can be controlled by the external control signal PS_ctrl.
[0086] S3, the phase shifter controls the RF link to achieve gain based on a selected set of reference voltages.
[0087] A phase shifter selects one set of reference voltages to achieve a specific gain value, and the voltage difference between the two outputs of any set is different. In this embodiment, the phase shifter is a 180-degree phase shifter, with differential signals as both input and output. For details, see [link to documentation]. Figure 4 The phase shifter includes a first transistor, a second transistor, a third transistor, and a fourth transistor. The gates of the first and fourth transistors are connected, as are the gates of the second and third transistors. One path of the differential input signal is connected to the source terminals of the first and second transistors, and the other path is connected to the source terminals of the third and fourth transistors. The drains of the first and third transistors are connected as one output of the differential signal, and the drains of the second and fourth transistors are connected as the other output of the differential signal.
[0088] State 1: When the two output voltages Vctrl1 > Vctrl2 of the switching group, Vctrl1 is applied to the gates of the first and fourth transistors, and its gain increases with temperature. Conversely, Vctrl2 is applied to the gates of the second and third transistors, and its gain decreases with temperature. If the first transistor outputs VOUT1 and the third transistor outputs VOUT3, since Vctrl1 > Vctrl2, the first transistor has a greater gain than the third transistor at any temperature, resulting in VOUT1 > VOUT3. Because the phase difference between the output signals of the first and third transistors is 180 degrees, the combined output of the first and third transistors is VOUT1 - VOUT3. Since the gain of the first transistor increases with increasing temperature and the gain of the third transistor decreases with increasing temperature, the combined signal amplitude OUT_P (i.e., VOUT1-VOUT3) increases with increasing temperature. Similarly, if the output signal of the second transistor is VOUT2 and the output signal of the fourth transistor is VOUT4, since Vctrl1 > Vctrl2, the gain of the fourth transistor is greater than that of the second transistor at any temperature, thus VOUT4 > VOUT2. Since the phase difference between the output signals of the second and fourth transistors is 180 degrees, the combined output of the second and fourth transistors is VOUT4 - VOUT2. Since the gain of the fourth transistor increases with increasing temperature and the gain of the second transistor decreases with increasing temperature, the combined signal amplitude OUT_N (i.e., VOUT4-VOUT2) increases with increasing temperature. Therefore, the output differential signals OUT_P and OUT_N increase with increasing temperature.
[0089] State 2: When the two voltages Vctrl1 and Vctrl2 of the switch group output are less than Vctrl2, the differential signals OUT_P and OUT_N can be increased with the temperature. The difference from State 1 is that when VOUT1 < VOUT3, the output of OUT_P is VOUT3-VOUT1, and when VOUT4 < VOUT2, the output of OUT_P is VOUT2-VOUT4. That is, the amplitude of the differential output signal remains unchanged, but the phase is flipped by 180 degrees.
[0090] Since the reference voltage selected by the phase shifter is any one of the N sets of reference voltages generated and output by the bandgap reference, in principle, the phase shifter can control the RF link based on the selected reference voltage to achieve a specific value of gain, and the voltage difference between the two outputs of any set is different.
[0091] This completes the entire process of a multi-mode RF link wide-temperature gain compensation method in this embodiment.
[0092] To verify the effectiveness of the multi-mode RF link wide-temperature gain compensation method (which also corresponds to the multi-mode RF link wide-temperature gain compensation device in Embodiment 1) in performing RF link wide-temperature gain compensation, we conducted the following experiments.
[0093] See Figure 6 The curves shown in the figure compare the insertion loss (negative gain is generally referred to as insertion loss) of the circuit before and after adopting the method of this embodiment. As can be seen from the figure, in the range of -55 to 125℃, before the temperature compensation scheme was adopted, the gain of the circuit decreased with the increase of temperature, and the gain decreased by 1dB at 125℃ compared with -55℃. After adopting the temperature compensation scheme proposed in this embodiment, the gain of the circuit increased with the increase of temperature, and the gain increased by more than 4.5dB at 125℃ compared with -55℃. When this circuit is applied to the RF link, it can compensate for the negative impact of the decrease in gain of other circuit modules with the increase of temperature on the wide-temperature operating characteristics of the RF link, so that the gain fluctuation of the RF circuit is significantly reduced in a wide temperature range.
[0094] It is understood that the multi-mode RF link wide-temperature gain compensation method provided in this embodiment of the invention corresponds to the above-mentioned multi-mode RF link wide-temperature gain compensation device. The explanation, examples, and beneficial effects of the relevant content can be referred to the corresponding content in the multi-mode RF link wide-temperature gain compensation device, and will not be repeated here.
[0095] In summary, compared with existing technologies, it has the following beneficial effects:
[0096] 1. The multi-mode RF link wide-temperature gain compensation device of the present invention includes a bandgap reference, a temperature decoder, and a phase shifter. The bandgap reference outputs N sets of reference voltages, each containing two different values. The temperature decoder then selects any one of these N sets of reference voltages based on preset multiple reference voltage gating methods and inputs it into the phase shifter. Finally, the phase shifter controls the RF link to achieve gain based on the selected reference voltage. This invention reuses the original phase shifter and its related circuitry in the RF link. Compared to existing technologies, without increasing hardware or circuit size, it achieves wide-temperature gain compensation of the RF link through multiple modes. This not only results in more significant gain compensation and lower power consumption, but also allows for flexible switching between multiple modes according to actual needs, making the control method more flexible.
[0097] 2. This invention sets the output code value of the temperature decoder to multiple modes, thereby controlling the switching group to conduct and output the reference voltage to control the phase shifter gain. Temperature compensation can be achieved by the temperature sensor automatically controlling the code value, or the code value can be controlled by an external control power supply according to actual needs. The wide-temperature gain compensation method of the RF link is more flexible.
[0098] 3. Compared with the compensation method based on adjusting amplifier gain with temperature changes, the present invention has a more obvious gain compensation effect and lower power consumption; compared with the power control method based on attenuators, the present invention does not increase the size of the core circuit, and the other components except the phase shifter can be placed in the blank space of the layout without increasing the length of the RF channel, thus reducing the cost.
[0099] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0100] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims
1. A multi-mode radio frequency link wide-temperature gain compensation device, characterized in that, The device includes: Bandgap reference, temperature decoder, and phase shifter; The bandgap reference is used to output N sets of reference voltages; wherein each set of reference voltages contains two voltages with different values; The temperature decoder is used to select any one set of reference voltages from the N sets of reference voltages based on a preset multiple reference voltage gating method and input it into the phase shifter; The phase shifter controls the RF link to achieve gain based on the selected reference voltage; the phase shifter is a 180-degree phase shifter, which includes a first transistor, a second transistor, a third transistor, and a fourth transistor; the gates of the first transistor and the fourth transistor are connected, and the gates of the second transistor and the third transistor are connected; one path of the input differential signal of the multi-mode RF link wide-temperature gain compensation device is connected to the source of the first transistor and the second transistor, and the other path of the input differential signal is connected to the source of the third transistor and the fourth transistor; the drains of the first transistor and the third transistor are connected as one output of the output differential signal, and the drains of the second transistor and the fourth transistor are connected as the other output of the output differential signal; The selected reference voltage includes two voltages with different values; the first voltage is applied to the gates of the first transistor and the fourth transistor, and the second voltage is applied to the gates of the second transistor and the third transistor; the gain of the first transistor and the fourth transistor increases as the first voltage increases, and the gain of the second transistor and the third transistor decreases as the second voltage decreases. The difference between the drains of the first transistor and the third transistor is used as the first output differential signal after their drains are connected. The difference between the drains of the second transistor and the fourth transistor is used as the second output differential signal after their drains are connected. The amplitude of the first output differential signal is determined by the gain difference between the first transistor and the third transistor, and the second output differential signal is determined by the gain difference between the second transistor and the fourth transistor.
2. The apparatus as claimed in claim 1, characterized in that, The temperature decoder includes N temperature sensors, a decoding circuit, and a single-pole double-throw switch group.
3. The apparatus as described in claim 1, characterized in that, The preset multiple reference voltage selection methods include: using multiple code value generation modes to control the temperature decoder to output different code values to turn on corresponding switch groups, so as to control the selection of multiple different reference voltages.
4. The apparatus as described in claim 3, characterized in that, The various code value generation modes include: Mode 1: The code value output by the temperature decoder is automatically generated as the ambient temperature collected by the temperature sensor changes. Mode 2: The code value output by the temperature decoder is input externally according to user requirements.
5. The apparatus as described in claim 4, characterized in that, The temperature decoder control bit Mode is used to switch between Mode 1 and Mode 2.
6. A method for wide-temperature gain compensation in a multi-mode radio frequency link, characterized in that, The method utilizes the apparatus described in any one of claims 1-5 to achieve wide-temperature gain compensation for multi-mode radio frequency links, and the method includes: The bandgap reference outputs N sets of reference voltages; each set of reference voltages contains two voltages with different values. The temperature decoder selects any one set of reference voltages from N sets of reference voltages based on a preset multiple reference voltage selection method; The phase shifter controls the RF link to achieve gain based on a selected set of reference voltages.
7. The method as described in claim 6, characterized in that, The preset multiple reference voltage selection methods include: using multiple code value generation modes to control the temperature decoder to output different code values to turn on corresponding switch groups, so as to control the selection of multiple different reference voltages.
8. The method as described in claim 7, characterized in that, The various code value generation modes include: Mode 1: The code value output by the temperature decoder is automatically generated as the ambient temperature collected by the temperature sensor changes. Mode 2: The code value output by the temperature decoder is input externally according to user requirements; Furthermore, the temperature decoder control bit Mode is used to switch between Mode 1 and Mode 2.
9. The method as described in claim 6, characterized in that, The phase shifter is a 180-degree phase shifter, specifically including a first transistor, a second transistor, a third transistor, and a fourth transistor; In this configuration, the gates of the first transistor and the fourth transistor are connected, and the gates of the second transistor and the third transistor are connected; one path of the input differential signal of the multi-mode RF link wide-temperature gain compensation device is connected to the source stages of the first transistor and the second transistor, and the other path of the input differential signal is connected to the source stages of the third transistor and the fourth transistor; the drains of the first transistor and the third transistor are connected as one output of the output differential signal, and the drains of the second transistor and the fourth transistor are connected as the other output of the output differential signal.
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