Amplifier circuit

Abstract

The utility model discloses an amplifier circuit which comprises an amplifier tube, a negative feedback circuit and a temperature control gain adjusting module, the amplifier tube amplifies input power based on preset gain by setting the gain of the amplifier tube, and the negative feedback circuit generates a negative feedback signal based on output power of the amplifier tube. And a temperature control gain adjusting module is added, so that the feedback voltage of the control end of the amplifier tube can be adjusted based on the current environment temperature and the negative feedback signal, and the gain of the amplifier tube is the preset gain. By adding the temperature control gain adjustment module, not only is negative feedback adjustment performed on the gain of the amplifier tube through the output power of the amplifier tube, but also the influence of the temperature on the gain of the amplifier tube is considered, namely, the feedback voltage of the control end of the amplifier tube is adjusted based on the output power of the amplifier tube and the current environment temperature at the same time; the gain adjustment of the amplifier tube is realized, the gain of the amplifier tube at different environment temperatures is ensured to be the preset gain, and the stability of the output power of the amplifier tube is ensured.

Description

Technical Field

[0001] This utility model relates to the field of power electronics technology, and in particular to an amplifier circuit. Background Technology

[0002] An RF amplifier typically includes an amplifying transistor and a negative feedback circuit. The control terminal of the amplifying transistor is the power input terminal, the first terminal is the output terminal, and the second terminal is grounded. The negative feedback circuit is connected between the control terminal and the output terminal of the amplifying transistor. By setting the gain of the amplifying transistor, it amplifies the input power and outputs it. The negative feedback circuit generates a negative feedback signal based on the output power of the amplifying transistor and sends it to the control terminal of the amplifying transistor to ensure the stability of the output power of the amplifying transistor.

[0003] However, due to the influence of temperature, the gain of the amplifier tube will deviate. For example, when the temperature is higher than the maximum temperature threshold for normal operation of the amplifier tube, the gain of the amplifier tube will be smaller, and when the temperature is lower than the minimum temperature threshold for normal operation of the amplifier tube, the gain of the amplifier tube will be larger. This will cause the output power of the amplifier tube to be unstable and not meet the requirements. Utility Model Content

[0004] The purpose of this invention is to provide an amplifier circuit that, by adding a temperature-controlled gain adjustment module, not only adjusts the gain of the amplifier tube through negative feedback based on the output power of the amplifier tube, but also considers the influence of temperature on the gain of the amplifier tube. That is, based on the output power of the amplifier tube and the current ambient temperature, the feedback voltage of the control terminal of the amplifier tube is adjusted to achieve the adjustment of the gain of the amplifier tube, ensuring that the gain of the amplifier tube is the preset gain under different ambient temperatures, and ensuring the stability of the output power of the amplifier tube.

[0005] To solve the above-mentioned technical problems, this utility model provides an amplifier circuit, including:

[0006] The amplifier tube has a control terminal as the power input terminal, a first terminal connected to the power supply voltage and serving as the power output terminal, and a second terminal grounded. It is used to amplify the input power based on a preset gain.

[0007] The negative feedback circuit has a first terminal connected to the output terminal of the amplifier tube and a second terminal connected to the first terminal of the temperature control gain adjustment module. It is used to generate a negative feedback signal based on the output power of the amplifier tube. The negative feedback signal is positively correlated with the output power.

[0008] The temperature control gain adjustment module has its second terminal connected to the control terminal of the amplifier tube, and is used to adjust the feedback voltage of the control terminal of the amplifier tube based on the current ambient temperature and the negative feedback signal, so that the gain of the amplifier tube is the preset gain.

[0009] The feedback voltage is negatively correlated with the current ambient temperature and positively correlated with the negative feedback signal. The gain of the amplifier tube is negatively correlated with the feedback voltage.

[0010] Preferably, the temperature control gain adjustment module includes:

[0011] A temperature control bias module is connected to the control terminal of the gain adjustment module and is used to adjust the first voltage input to the control terminal of the gain adjustment module based on the current ambient temperature. The first voltage is negatively correlated with the current ambient temperature.

[0012] The gain adjustment module has a first terminal connected to the second terminal of the negative feedback circuit and a second terminal connected to the control terminal of the amplifier tube. It is used to adjust its own first impedance based on the first voltage, so as to adjust the feedback voltage of the control terminal of the amplifier tube based on the negative feedback signal, so that the gain of the amplifier tube is the preset gain.

[0013] The first impedance is negatively correlated with the first voltage; the feedback voltage is negatively correlated with the first impedance.

[0014] Preferably, the gain adjustment module includes:

[0015] The first terminal is connected to the second terminal of the negative feedback circuit, and the second terminal is connected to the first terminal of the gain adjustment switch. The first isolation capacitor is used to isolate the voltage of the first terminal of the gain adjustment switch.

[0016] The first terminal is connected to the second terminal of the gain adjustment switch, and the second terminal is connected to the control terminal of the amplifier tube. The second isolation capacitor is used to isolate the voltage of the second terminal of the gain adjustment switch.

[0017] The gain adjustment switch tube, which is connected to the temperature control bias module at the control terminal, is used to adjust its own first impedance based on the first voltage, so as to adjust the feedback voltage of the control terminal of the amplifier tube based on the negative feedback signal, so that the gain of the amplifier tube is the preset gain.

[0018] Preferably, the temperature control bias module includes:

[0019] The first terminal is connected to the power supply voltage, and the second terminal is connected to the control terminal of the gain adjustment module, which is a first voltage divider resistor.

[0020] The temperature control switch circuit, with its first terminal connected to the control terminal of the gain adjustment module and its second terminal grounded, is used to adjust its second impedance based on the current ambient temperature to adjust the first voltage input to the control terminal of the gain adjustment module. The second impedance is negatively correlated with the current ambient temperature, and the first voltage is positively correlated with the second impedance.

[0021] Preferably, the temperature control switch circuit includes:

[0022] The first diode whose input terminal is connected to the control terminal of the gain adjustment module;

[0023] A second diode whose input terminal is connected to the output terminal of the first diode and whose output terminal is grounded;

[0024] The impedances of the first diode and the second diode are negatively correlated with the current ambient temperature.

[0025] Preferably, the temperature control switch circuit further includes:

[0026] The first terminal is connected to the second terminal of the temperature control switch circuit, and the second terminal is grounded by the second voltage divider resistor.

[0027] Preferably, the temperature control switch circuit further includes:

[0028] The first terminal is connected to the first terminal of the temperature control switch circuit, and the second terminal is connected to the control terminal of the gain adjustment module via a third voltage divider resistor.

[0029] Preferably, the negative feedback circuit includes:

[0030] The first terminal is connected to the first terminal of the temperature control gain adjustment module, and the second terminal is connected to the current limiting resistor of the first terminal of the filter inductor.

[0031] The filter inductor whose second end is connected to the first end of the amplifier tube.

[0032] Preferably, it further includes:

[0033] The input terminal is an RF input terminal, and the output terminal is connected to the control terminal of the amplifier tube. The input matching circuit is used to perform input impedance matching between the RF input terminal and the control terminal of the amplifier tube.

[0034] The input terminal is connected to the first end of the amplifier tube, and the output terminal is the output matching circuit for radio frequency output, which is used to perform output impedance matching between the radio frequency output terminal and the first end of the amplifier tube.

[0035] Preferably, the voltage input terminal of the input matching circuit is connected to a bias voltage to provide the bias voltage for the amplifier tube, and the gain of the amplifier tube is negatively correlated with the bias voltage.

[0036] This application provides an amplifier circuit, including an amplifying transistor, a negative feedback circuit, and a temperature-controlled gain adjustment module. By setting the gain of the amplifying transistor, it amplifies the input power based on a preset gain. The negative feedback circuit generates a negative feedback signal based on the output power of the amplifying transistor. The added temperature-controlled gain adjustment module adjusts the feedback voltage at the control terminal of the amplifying transistor based on the current ambient temperature and the negative feedback signal, ensuring the amplifying transistor's gain is the preset gain. By adding the temperature-controlled gain adjustment module, not only is the amplifying transistor's gain adjusted via negative feedback based on its output power, but the influence of temperature on the amplifying transistor's gain is also considered. That is, the feedback voltage at the control terminal of the amplifying transistor is adjusted simultaneously based on both the output power and the current ambient temperature, thereby achieving gain adjustment and ensuring that the amplifying transistor's gain remains the preset gain under different ambient temperatures, thus guaranteeing stable output power. Attached Figure Description

[0037] To more clearly illustrate the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A schematic diagram of an amplifier circuit provided by this utility model;

[0039] Figure 2 This is a schematic diagram of the specific structure of an amplifier circuit provided by this utility model. Detailed Implementation

[0040] The core of this invention is to provide an amplifier circuit that, by adding a temperature-controlled gain adjustment module, not only adjusts the gain of the amplifier tube through negative feedback based on the output power of the amplifier tube, but also considers the influence of temperature on the gain of the amplifier tube. That is, based on the output power of the amplifier tube and the current ambient temperature, the feedback voltage of the control terminal of the amplifier tube is adjusted to achieve the adjustment of the gain of the amplifier tube, ensuring that the gain of the amplifier tube is the preset gain under different ambient temperatures, and ensuring the stability of the output power of the amplifier tube.

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0042] Please refer to Figure 1 , Figure 1 This utility model provides a schematic diagram of an amplifier circuit, which includes:

[0043] Amplifier tube 1 has a control terminal as the power input terminal, a first terminal connected to the power supply voltage VDD and serving as the power output terminal, and a second terminal grounded. It is used to amplify the input power based on a preset gain.

[0044] The negative feedback circuit 2 has a first end connected to the output end of the amplifier tube 1 and a second end connected to the first end of the temperature control gain adjustment module 3. It is used to generate a negative feedback signal based on the output power of the amplifier tube 1. The negative feedback signal is positively correlated with the output power.

[0045] Temperature control gain adjustment module 3, the second end of which is connected to the control end of amplifier tube 1, is used to adjust the feedback voltage of the control end of amplifier tube 1 based on the current ambient temperature and negative feedback signal so that the gain of amplifier tube 1 is the preset gain.

[0046] The feedback voltage is negatively correlated with the current ambient temperature and positively correlated with the negative feedback signal. The gain of amplifier tube 1 is negatively correlated with the feedback voltage.

[0047] An amplifier circuit typically includes an amplifier transistor 1 (ATM1), whose control terminal is the power input terminal. The power to be amplified is input from the control terminal of ATM1. ATM1 amplifies the input power based on a preset gain. A negative feedback circuit 2 feeds back the output power of ATM1 to its control terminal. ATM1 adjusts its impedance based on the input power applied to its control terminal and the negative feedback signal, thereby adjusting its gain to amplify the input power. However, the gain of ATM1 is affected by ambient temperature. If the ambient temperature is too high, exceeding the maximum operating temperature threshold of ATM1, the actual gain of ATM1 will be lower than the preset gain, resulting in lower output power. Conversely, if the ambient temperature is too low, below the minimum operating temperature threshold of ATM1, the actual gain of ATM1 will be higher than the preset gain, resulting in higher output power. However, the existing negative feedback circuit 2 cannot adjust the negative feedback signal applied to the control terminal of ATM1 according to the ambient temperature. Therefore, it cannot adjust the gain of ATM1 based on the ambient temperature, leading to deviations in the output power of ATM1 and failing to guarantee the desired power output.

[0048] To address the aforementioned technical issues, this application incorporates a temperature-controlled gain adjustment module 3 between the negative feedback circuit 2 and the control terminal of the amplifier tube 1. This module adjusts the feedback voltage at the control terminal of the amplifier tube 1 based on the current ambient temperature and the negative feedback signal. Specifically, the higher the ambient temperature, the lower the feedback voltage, resulting in a lower voltage at the control terminal of the amplifier tube 1, lower impedance, higher gain, and higher output power. Conversely, the lower the ambient temperature, the higher the feedback voltage, resulting in a higher voltage at the control terminal of the amplifier tube 1, higher impedance, lower gain, and lower output power. This adjusts the gain of the amplifier tube 1 to a preset gain, ensuring that the output power of the amplifier tube 1 meets actual requirements regardless of the ambient temperature.

[0049] Of course, the higher the output power of amplifier tube 1, the larger the negative feedback signal and the smaller the feedback voltage. The smaller the feedback voltage, the greater the gain of amplifier tube 1 and the greater the output power. Conversely, the lower the output power of amplifier tube 1, the smaller the negative feedback signal and the larger the feedback voltage. The larger the feedback voltage, the smaller the gain of amplifier tube 1 and the smaller the output power. This achieves negative feedback regulation of the output power of amplifier tube 1.

[0050] It should be noted that the amplifier transistor 1 in this application can be, but is not limited to, an NMOS (N-Metal-Oxide-Semiconductor). The gate of an NMOS is the control terminal, the drain is the first terminal, and the source is the second terminal. The higher the gate voltage, the lower the impedance and the greater the gain of the NMOS. Using an NMOS not only reduces cost but also provides faster operation and easier control.

[0051] The gain adjustment module in this application can be integrated with the negative feedback circuit into a single circuit, which occupies a smaller area and has a lower cost.

[0052] In summary, by adding a temperature control gain adjustment module 3, this application not only adjusts the gain of amplifier tube 1 through negative feedback based on the output power of amplifier tube 1, but also considers the influence of temperature on the gain of amplifier tube 1. That is, based on the output power of amplifier tube 1 and the current ambient temperature, the feedback voltage of the control terminal of amplifier tube 1 is adjusted to achieve the adjustment of the gain of amplifier tube 1, ensuring that the gain of amplifier tube 1 is the preset gain under different ambient temperatures, and ensuring the stability of the output power of amplifier tube 1.

[0053] Based on the above embodiments:

[0054] Please refer to Figure 2 , Figure 2 This is a schematic diagram of the specific structure of an amplifier circuit provided by this utility model.

[0055] In a preferred embodiment, the temperature control gain adjustment module 3 includes:

[0056] The temperature control bias module is connected to the control terminal of the gain adjustment module and is used to adjust the first voltage input to the control terminal of the gain adjustment module based on the current ambient temperature. The first voltage is negatively correlated with the current ambient temperature.

[0057] The gain adjustment module has its first end connected to the second end of the negative feedback circuit 2 and its second end connected to the control end of the amplifier tube 1. It is used to adjust its own first impedance based on the first voltage, so as to adjust the feedback voltage of the control end of the amplifier tube 1 based on the negative feedback signal, so that the gain of the amplifier tube 1 is the preset gain.

[0058] The first impedance is negatively correlated with the first voltage; the feedback voltage is negatively correlated with the first impedance.

[0059] In this embodiment, the gain adjustment module specifically includes a temperature control bias module and a gain adjustment module. The temperature control adjustment module can adjust the first voltage input to the control terminal of the gain adjustment module according to the current environmental conditions, thereby adjusting the first impedance of the gain adjustment module and thus adjusting the feedback voltage. Specifically, the higher the current ambient temperature, the lower the first voltage, the higher the first impedance of the gain adjustment module, the lower the feedback voltage, the greater the gain of amplifier tube 1, and the higher the output power; conversely, the lower the current ambient temperature, the higher the first voltage, the lower the first impedance of the gain adjustment module, the higher the feedback voltage, the smaller the gain of amplifier tube 1, and the lower the output power. This achieves negative feedback adjustment of amplifier tube 1 based on the current ambient temperature, ensuring that the output power of amplifier tube 1 meets the required power.

[0060] By setting up a temperature control bias module, the system can respond to the current ambient temperature more quickly, thereby enabling timely negative feedback adjustment of the gain of amplifier tube 1.

[0061] It should be noted that, Figure 2 The amplifier tube T in the middle is Figure 1 Amplifying tube 1 in the middle.

[0062] In a preferred embodiment, the gain adjustment module includes:

[0063] The first terminal is connected to the second terminal of the negative feedback circuit 2, and the second terminal is connected to the first terminal of the gain adjustment switch SW. The first isolation capacitor C1 is used to isolate the voltage of the first terminal of the gain adjustment switch SW.

[0064] The first terminal is connected to the second terminal of the gain adjustment switch SW, and the second terminal is connected to the control terminal of the amplifier tube 1. The second isolation capacitor C2 is used to isolate the voltage of the second terminal of the gain adjustment switch SW.

[0065] The gain adjustment switch SW, which is connected to the temperature control bias module, is used to adjust its own first impedance based on the first voltage, so as to adjust the feedback voltage of the control terminal of the amplifier tube 1 based on the negative feedback signal, so that the gain of the amplifier tube 1 is the preset gain.

[0066] The gain adjustment module in this embodiment specifically includes a gain adjustment switch SW. The first impedance of the gain adjustment switch SW changes with the voltage at its control terminal. The higher the voltage at the control terminal, the lower the first impedance, and the larger the negative feedback signal through itself, that is, the larger the feedback voltage. The lower the voltage at the control terminal, the lower the first impedance, and the smaller the negative feedback signal through itself, that is, the larger the feedback voltage.

[0067] Furthermore, isolation capacitors are respectively provided at the first and second terminals of the gain adjustment switch SW. These isolation capacitors store charge, thus providing current when the voltage at either terminal of the gain adjustment switch SW changes, effectively separating the signals from each component and preventing interference. This isolation function enables the gain adjustment switch SW to possess isolation and coupling capabilities in high-frequency circuits, ensuring circuit stability and anti-interference ability, and also protecting the gain adjustment switch SW from factors such as overvoltage and overcurrent.

[0068] Among them, the gain adjustment switch SW can be, but is not limited to, being implemented by an NMOS. The gate of the NMOS is the control terminal, the drain is the first terminal, and the source is the second terminal.

[0069] In a preferred embodiment, the temperature control bias module includes:

[0070] The first terminal is connected to the power supply voltage VDD, and the second terminal is connected to the first voltage divider resistor R1, which is connected to the control terminal of the gain adjustment module.

[0071] The temperature control switch circuit, with its first terminal connected to the control terminal of the gain adjustment module and its second terminal grounded, is used to adjust its second impedance based on the current ambient temperature in order to adjust the first voltage input to the control terminal of the gain adjustment module. The second impedance is negatively correlated with the current ambient temperature, and the first voltage is positively correlated with the second impedance.

[0072] The temperature control bias module in this embodiment specifically includes a first voltage divider resistor R1 and a temperature control switch circuit. The temperature control switch circuit can adjust its second impedance according to the current ambient temperature, and then, through the voltage division function of the first voltage divider resistor R1, adjust the first voltage input to the control terminal of the gain adjustment module. Specifically, the higher the current ambient temperature, the lower the second impedance of the temperature control switch circuit, the smaller the voltage division of the temperature control switch circuit, the smaller the first voltage input to the control terminal of the gain adjustment module, the larger the first impedance of the gain adjustment module, the smaller the feedback voltage, and the larger the gain of amplifier tube 1. Conversely, the higher the current ambient temperature, the larger the second impedance of the temperature control switch circuit, the larger the voltage division of the temperature control switch circuit, the larger the first voltage input to the control terminal of the gain adjustment module, the smaller the first impedance of the gain adjustment module, the larger the feedback voltage, and the smaller the gain of amplifier tube 1.

[0073] Based on this, the gain of amplifier tube 1 can be adjusted quickly using negative feedback according to the current ambient temperature, so that amplifier tube 1 meets the preset gain.

[0074] In a preferred embodiment, the temperature control switch circuit includes:

[0075] The first diode D1 is connected to the input terminal of the gain adjustment module.

[0076] The input terminal of the second diode D2 is connected to the output terminal of the first diode D1, and the output terminal of the second diode is grounded.

[0077] The impedances of the first diode D1 and the second diode D2 are negatively correlated with the current ambient temperature.

[0078] In this embodiment, the temperature control switch circuit may specifically include a first diode D1 and a second diode D2, which are connected in series. Since the on-resistance of the diode is negatively correlated with the ambient temperature, when the ambient temperature is high, the impedance is low, resulting in a small voltage division, which reduces the first voltage input to the control terminal of the gain adjustment module, thereby increasing the first impedance of the gain adjustment module, reducing the feedback voltage, and increasing the gain of amplifier tube 1. When the ambient temperature is low, the impedance is high, resulting in a large voltage division, which increases the first voltage input to the control terminal of the gain adjustment module, thereby reducing the first impedance of the gain adjustment module, increasing the feedback voltage, and reducing the gain of amplifier tube 1.

[0079] In this embodiment, a diode is used to implement the temperature control switching circuit, which is not only sensitive to changes in ambient temperature, but also has a lower cost.

[0080] Of course, the temperature control switch circuit is not limited to being implemented only by a diode; any bias circuit with temperature characteristics can be used, and this application does not limit it in this regard.

[0081] In a preferred embodiment, the temperature control switch circuit further includes:

[0082] The first terminal is connected to the second terminal of the temperature control switch circuit, and the second terminal is grounded by the second voltage divider resistor R2.

[0083] In this embodiment, by setting a second voltage divider resistor R2 at the second end of the temperature control switch tube circuit, voltage division can be performed when the impedance of the temperature control switch tube circuit is low, thus avoiding overcurrent faults in the circuit.

[0084] In a preferred embodiment, the temperature control switch circuit further includes:

[0085] The first terminal is connected to the first terminal of the temperature control switch circuit, and the second terminal is connected to the third voltage divider resistor R4, which is connected to the control terminal of the gain adjustment module.

[0086] In this embodiment, a third voltage divider resistor R4 is also provided at the first end of the temperature control switch tube circuit and the control end of the gain adjustment module, which can limit the current at the control end of the gain adjustment module and prevent the gain adjustment module from being damaged by overcurrent.

[0087] In a preferred embodiment, the negative feedback circuit 2 includes:

[0088] The first terminal is connected to the first terminal of the temperature control gain adjustment module, and the second terminal is connected to the current limiting resistor R3 connected to the first terminal of the filter inductor L2.

[0089] The second end is connected to the first end of the amplifier tube 1 via the filter inductor L2.

[0090] The negative feedback circuit 2 in this embodiment specifically includes a current-limiting resistor R3 and a filter inductor L2, which can collect the output power of the amplifier tube 1 and generate a negative feedback signal to feed back to the control terminal of the amplifier tube 1, thereby realizing the negative feedback adjustment of the amplifier tube 1.

[0091] Specifically, the current-limiting resistor R3 can also protect the control terminal of amplifier tube 1 to avoid overcurrent damage, and the filter inductor L2 can filter out interference voltage to protect the circuit.

[0092] As a preferred embodiment, it also includes:

[0093] The input terminal is the radio frequency input terminal RFIN, and the output terminal is connected to the control terminal of amplifier tube 1 via the input matching circuit IMN, which is used to perform input impedance matching between the radio frequency input terminal and the control terminal of amplifier tube 1.

[0094] The input terminal is connected to the first end of amplifier tube 1, and the output terminal is the output matching circuit OMN for RF output RFOUT, which is used to perform output impedance matching between the RF output terminal and the first end of amplifier tube 1.

[0095] In this embodiment, the control terminal of amplifier tube 1 is equipped with an input matching circuit IMN, and the first terminal is equipped with an output matching circuit OMN. Through input-output matching, it can be ensured that the high-frequency microwave signal can be smoothly transmitted to amplifier tube 1, reducing signal reflection and improving energy efficiency. Matching circuits typically involve adjusting impedance matching to ensure that the high-frequency microwave signal can be smoothly transmitted to the load point, reducing signal reflection and improving energy efficiency. Impedance matching typically involves adjusting the internal resistance of the signal source and the load impedance to achieve optimal matching. Furthermore, its main purpose is to achieve maximum power transmission of amplifier tube 1. Through the design of the matching circuit, it can be ensured that amplifier tube 1 transmits maximum power under optimal operating conditions, improving system efficiency. An inductor L1 can also be included in the output matching circuit OMN to suppress harmonics.

[0096] In a preferred embodiment, the voltage input terminal of the input matching circuit IMN is connected to a bias voltage Vg to provide a bias voltage Vg for the amplifier transistor 1. The gain of the amplifier transistor 1 is negatively correlated with the bias voltage Vg.

[0097] In this embodiment, a bias voltage Vg is applied to the voltage input terminal of the input matching circuit IMN. This bias voltage Vg can adjust the gain of amplifier transistor 1. Specifically, the bias voltage Vg must be no less than the turn-on voltage of amplifier transistor 1 so that amplifier transistor 1 can perform power amplification when it is in the turn-on state. Furthermore, by increasing the bias voltage Vg, the impedance of amplifier transistor 1 decreases, and its gain increases; by decreasing the bias voltage Vg, the impedance of amplifier transistor 1 increases, and its gain decreases.

[0098] By setting the bias voltage Vg, a stable reference level can be provided, enabling the circuit to operate normally under different environmental conditions. This ensures that amplifier transistor 1 is in an appropriate operating state, allowing it to amplify or process input signals correctly. By setting a suitable bias voltage Vg, amplifier transistor 1 can operate in the linear region, avoiding problems such as nonlinear distortion and output offset.

[0099] It should also be noted that, in this specification, 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 description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. An amplifier circuit, characterized in that, include: The amplifier tube has a control terminal as the power input terminal, a first terminal connected to the power supply voltage and serving as the power output terminal, and a second terminal grounded. It is used to amplify the input power based on a preset gain. The negative feedback circuit has a first terminal connected to the output terminal of the amplifier tube and a second terminal connected to the first terminal of the temperature control gain adjustment module. It is used to generate a negative feedback signal based on the output power of the amplifier tube. The negative feedback signal is positively correlated with the output power. The temperature control gain adjustment module has its second terminal connected to the control terminal of the amplifier tube, and is used to adjust the feedback voltage of the control terminal of the amplifier tube based on the current ambient temperature and the negative feedback signal, so that the gain of the amplifier tube is the preset gain. The feedback voltage is negatively correlated with the current ambient temperature and positively correlated with the negative feedback signal. The gain of the amplifier tube is negatively correlated with the feedback voltage.

2. The amplifier circuit as described in claim 1, characterized in that, The temperature control gain adjustment module includes: A temperature control bias module is connected to the control terminal of the gain adjustment module and is used to adjust the first voltage input to the control terminal of the gain adjustment module based on the current ambient temperature. The first voltage is negatively correlated with the current ambient temperature. The gain adjustment module has a first terminal connected to the second terminal of the negative feedback circuit and a second terminal connected to the control terminal of the amplifier tube. It is used to adjust its own first impedance based on the first voltage, so as to adjust the feedback voltage of the control terminal of the amplifier tube based on the negative feedback signal, so that the gain of the amplifier tube is the preset gain. The first impedance is negatively correlated with the first voltage; the feedback voltage is negatively correlated with the first impedance.

3. The amplifier circuit as described in claim 2, characterized in that, The gain adjustment module includes: The first terminal is connected to the second terminal of the negative feedback circuit, and the second terminal is connected to the first terminal of the gain adjustment switch. The first isolation capacitor is used to isolate the voltage of the first terminal of the gain adjustment switch. The first terminal is connected to the second terminal of the gain adjustment switch, and the second terminal is connected to the control terminal of the amplifier tube. The second isolation capacitor is used to isolate the voltage of the second terminal of the gain adjustment switch. The gain adjustment switch tube, which is connected to the temperature control bias module at the control terminal, is used to adjust its own first impedance based on the first voltage, so as to adjust the feedback voltage of the control terminal of the amplifier tube based on the negative feedback signal, so that the gain of the amplifier tube is the preset gain.

4. The amplifier circuit as described in claim 2, characterized in that, The temperature control bias module includes: The first terminal is connected to the power supply voltage, and the second terminal is connected to the control terminal of the gain adjustment module, which is a first voltage divider resistor. The temperature control switch circuit, with its first terminal connected to the control terminal of the gain adjustment module and its second terminal grounded, is used to adjust its second impedance based on the current ambient temperature to adjust the first voltage input to the control terminal of the gain adjustment module. The second impedance is negatively correlated with the current ambient temperature, and the first voltage is positively correlated with the second impedance.

5. The amplifier circuit as described in claim 4, characterized in that, The temperature control switch circuit includes: The first diode whose input terminal is connected to the control terminal of the gain adjustment module; A second diode whose input terminal is connected to the output terminal of the first diode and whose output terminal is grounded; The impedances of the first diode and the second diode are negatively correlated with the current ambient temperature.

6. The amplifier circuit as described in claim 4, characterized in that, The temperature control switch circuit also includes: The first terminal is connected to the second terminal of the temperature control switch circuit, and the second terminal is grounded by the second voltage divider resistor.

7. The amplifier circuit as described in claim 4, characterized in that, The temperature control switch circuit also includes: The first terminal is connected to the first terminal of the temperature control switch circuit, and the second terminal is connected to the control terminal of the gain adjustment module via a third voltage divider resistor.

8. The amplifier circuit as described in claim 1, characterized in that, The negative feedback circuit includes: The first terminal is connected to the first terminal of the temperature control gain adjustment module, and the second terminal is connected to the current limiting resistor of the first terminal of the filter inductor. The filter inductor whose second end is connected to the first end of the amplifier tube.

9. The amplifier circuit according to any one of claims 1-8, characterized in that, Also includes: The input terminal is an RF input terminal, and the output terminal is connected to the control terminal of the amplifier tube. The input matching circuit is used to perform input impedance matching between the RF input terminal and the control terminal of the amplifier tube. The input terminal is connected to the first end of the amplifier tube, and the output terminal is the output matching circuit for radio frequency output, which is used to perform output impedance matching between the radio frequency output terminal and the first end of the amplifier tube.

10. The amplifier circuit as described in claim 9, characterized in that, The input matching circuit is connected to a bias voltage to provide the bias voltage for the amplifier tube, and the gain of the amplifier tube is negatively correlated with the bias voltage.

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