An amplitude adjustment circuit for multi-channel applications

Abstract

The utility model discloses an amplitude adjustment circuit applied to multiple channels, belonging to the technical field of multi-channel radio frequency circuits, which includes a power supply circuit, a control circuit and a radio frequency circuit; the power supply circuit is respectively connected to the radio frequency circuit and the control circuit; the control circuit is connected to the radio frequency circuit, and the control circuit controls the radio frequency circuit through a signal. The amplitude adjustment circuit is arranged in different channels, and the input end of the amplitude adjustment circuit is connected to a bandpass filter, and the output end of the amplitude adjustment circuit is connected to the input end of an amplifier. The amplitude modulation unit of the utility model is used to negatively and positively adjust the amplitude of an input radio frequency signal; the radio frequency switch is used to connect or disconnect each amplitude modulation unit, so as to realize the corresponding amplitude adjustment of the input radio frequency signal, which can effectively solve the application problems such as insufficient amplitude consistency of multiple radio frequency channels.

Description

Technical Field

[0001] The utility model belongs to the technical field of multi-channel radio frequency circuits, and in particular relates to an amplitude adjustment circuit applied to multiple channels. Background Art

[0002] Multi-channel amplitude consistency technology is an important technology to ensure the consistency of amplitude response between channels in a multi-channel signal processing system. In a signal processing system, when multiple channels receive or process signals at the same time, due to various factors, such as hardware differences and different signal processing algorithms, the amplitude response between channels may be inconsistent, thus affecting the accuracy and reliability of signal processing.

[0003] Multi-channel amplitude consistency technology aims to solve this problem. It compensates the amplitude of each channel through a series of technical means so that the output amplitude difference of each channel can be minimized under the same input signal.

[0004] It is widely used in wireless communications, audio processing, image processing and other fields. It helps to improve the accuracy and reliability of signal processing and is of great significance to multi-channel signal processing systems. Utility Model Content

[0005] The purpose of the utility model is to provide an amplitude adjustment circuit for multi-channels to address the above-mentioned deficiencies in the prior art, so as to solve the problem of inconsistent amplitude responses between channels due to hardware differences, different signal processing algorithms, etc.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] An amplitude adjustment circuit applied to multiple channels, comprising a power supply circuit, a control circuit and a radio frequency circuit;

[0008] The power circuit is connected to the radio frequency circuit and the control circuit respectively; the control circuit is connected to the radio frequency circuit, and the control circuit controls the radio frequency circuit through signals.

[0009] Furthermore, the amplitude adjustment circuit is arranged in different channels, and the input end of the amplitude adjustment circuit is connected to the bandpass filter, and the output end of the amplitude adjustment circuit is connected to the input end of the amplifier.

[0010] Furthermore, the radio frequency circuit includes a plurality of radio frequency switches and a plurality of amplitude modulation units; the amplitude modulation unit is an amplitude unit, the radio frequency switch is connected to the amplitude unit, and different amplitude units are selected by controlling the radio frequency switch to switch.

[0011] Further, the radio frequency switch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch;

[0012] The input end of the first switch is connected to the output end of the bandpass filter, one output end of the first switch is connected to the input end of the -0.5dB amplitude unit, the output end of the -0.5dB amplitude unit and the other output end of the first switch are respectively connected to the two input ends of the second switch, and the output end of the second switch is connected to the input end of the third switch;

[0013] One output end of the third switch is connected to the input end of the -1dB amplitude unit, the output end of the -1dB amplitude unit and the other output end of the third switch are respectively connected to two input ends of the fourth switch, and the output end of the fourth switch is connected to the input end of the fifth switch;

[0014] One output end of the fifth switch is connected to the input end of the -2dB amplitude unit, the output end of the -2dB amplitude unit and the other output end of the fifth switch are respectively connected to the two input ends of the sixth switch, and the output end of the sixth switch is connected to the input end of the seventh switch;

[0015] One output end of the seventh switch is connected to the input end of the -0.5dB amplitude unit, the output end of the -0.5dB amplitude unit and the other output end of the seventh switch are respectively connected to the two input ends of the eighth switch, and the output end of the eighth switch is connected to the input end of the ninth switch;

[0016] One output end of the ninth switch is connected to the input end of the -1dB amplitude unit, the output end of the -1dB amplitude unit and the other output end of the ninth switch are respectively connected to the two input ends of the tenth switch, and the output end of the tenth switch is connected to the input end of the eleventh switch;

[0017] An output end of the eleventh switch is connected to the input end of the -2dB amplitude unit, the output end of the -2dB amplitude unit and the other output end of the eleventh switch are respectively connected to two input ends of the twelfth switch, and the output end of the twelfth switch is connected to the input end of the amplifier.

[0018] Furthermore, the power supply circuit includes a voltage stabilizer, and the voltage stabilizer supplies power to the control circuit and the radio frequency circuit respectively.

[0019] Furthermore, the control circuit includes a displacement buffer; the displacement buffer is connected to the radio frequency switch to convert the serial input control signal into six parallel signal outputs to control the switching of the radio frequency switch.

[0020] Furthermore, the amplitude modulation unit is a π-type attenuator.

[0021] Further, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch are all single-pole double-throw switches.

[0022] The amplitude adjustment circuit applied to multiple channels provided by the utility model has the following beneficial effects:

[0023] The amplitude modulation unit of the utility model is used to negatively and positively adjust the amplitude of the input radio frequency signal; the radio frequency switch is used to connect or disconnect each amplitude modulation unit, so as to achieve corresponding amplitude adjustment of the input radio frequency signal, which can effectively solve the application problem of insufficient amplitude consistency of multiple radio frequency channels. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The utility model is a principle block diagram of an amplitude adjustment circuit applied to multiple channels.

[0025] Figure 2 The utility model is a circuit principle block diagram of the amplitude adjustment circuit applied to multiple channels. DETAILED DESCRIPTION

[0026] The specific implementation methods of the utility model are described below to facilitate technical personnel in this technical field to understand the utility model, but it should be clear that the utility model is not limited to the scope of the specific implementation methods. For ordinary technical personnel in this technical field, as long as various changes are within the spirit and scope of the utility model defined and determined by the attached claims, these changes are obvious, and all utility model creations using the concept of the utility model are protected.

[0027] Example 1

[0028] This embodiment provides an amplitude adjustment circuit for multiple channels, which is used to solve the problem that the amplitude response of each channel may be inconsistent due to hardware differences, signal processing algorithms, etc. in the prior art. Figure 1 , this embodiment specifically includes:

[0029] Power circuit, control circuit and radio frequency circuit;

[0030] The power circuit is connected to the radio frequency circuit and the control circuit respectively; the control circuit is connected to the radio frequency circuit, and the control circuit controls the radio frequency circuit through signals.

[0031] Specifically, as a preferred embodiment of the present embodiment, the power supply circuit mainly includes a voltage regulator, preferably an LT1764 voltage regulator, which is used to provide the required power supply voltage to the control circuit and the radio frequency circuit.

[0032] The control circuit includes a serial input to parallel output displacement buffer, preferably a 74HC595 displacement buffer, which converts the serial input control signal into six parallel signal outputs, which are then respectively connected to the RF switches in the RF circuit to achieve switching of the RF switches.

[0033] The RF circuit includes several RF switches and several amplitude modulation units; the amplitude modulation unit is an amplitude unit, the RF switch is connected to the amplitude unit, and different amplitude units are selected by controlling the RF switch to switch; the amplitude modulation unit corresponds to Figure 1 -0.5dB amplitude unit, -1dB amplitude unit, -2dB amplitude unit.

[0034] Among them, the radio frequency switch is used to switch and select different amplitude units;

[0035] Amplitude modulation unit, a single amplitude modulation unit is a π-type attenuator composed of three resistors, and the corresponding amplitude modulation unit is formed according to the corresponding resistance value. When the RF switch is switched to the corresponding amplitude modulation unit, the amplitude modulation unit realizes the corresponding amplitude adjustment of the input RF signal.

[0036] As a preferred embodiment of this embodiment, the radio frequency switch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch;

[0037] The input end of the first switch is connected to the output end of the bandpass filter, one output end of the first switch is connected to the input end of the -0.5dB amplitude unit, the output end of the -0.5dB amplitude unit and the other output end of the first switch are respectively connected to the two input ends of the second switch, and the output end of the second switch is connected to the input end of the third switch;

[0038] One output end of the third switch is connected to the input end of the -1dB amplitude unit, the output end of the -1dB amplitude unit and the other output end of the third switch are respectively connected to two input ends of the fourth switch, and the output end of the fourth switch is connected to the input end of the fifth switch;

[0039] One output end of the fifth switch is connected to the input end of the -2dB amplitude unit, the output end of the -2dB amplitude unit and the other output end of the fifth switch are respectively connected to the two input ends of the sixth switch, and the output end of the sixth switch is connected to the input end of the seventh switch;

[0040] One output end of the seventh switch is connected to the input end of the -0.5dB amplitude unit, the output end of the -0.5dB amplitude unit and the other output end of the seventh switch are respectively connected to the two input ends of the eighth switch, and the output end of the eighth switch is connected to the input end of the ninth switch;

[0041] One output end of the ninth switch is connected to the input end of the -1dB amplitude unit, the output end of the -1dB amplitude unit and the other output end of the ninth switch are respectively connected to the two input ends of the tenth switch, and the output end of the tenth switch is connected to the input end of the eleventh switch;

[0042] An output end of the eleventh switch is connected to the input end of the -2dB amplitude unit, the output end of the -2dB amplitude unit and the other output end of the eleventh switch are respectively connected to two input ends of the twelfth switch, and the output end of the twelfth switch is connected to the input end of the amplifier.

[0043] The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch of this embodiment correspond to Figure 1 Switch 1, switch 2, switch 3, switch 4, switch 5, switch 6, switch 7, switch 8, switch 9, switch 10, switch 11, and switch 12.

[0044] According to a preferred embodiment of the present invention, the first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch are all single-pole double-throw switches.

[0045] Among them, the first switch, the third switch, the fifth switch, the seventh switch, the ninth switch, and the eleventh switch are Yaguang VD7515 single-pole double-throw switches; the second switch, the fourth switch, the sixth switch, the eighth switch, the tenth switch, and the twelfth switch are all Yaguang VD7516 single-pole double-throw switches.

[0046] When performing RF signal amplitude modulation operations:

[0047] The external serial control signal in the control circuit is converted into a six-bit parallel control signal by 74HC595. The first control signal simultaneously controls the switching of the first switch and the second switch, ..., and the sixth control signal simultaneously controls the switching of the eleventh switch and the twelfth switch.

[0048] For example, when the first control signal is at a high level, the RFC port of the first switch is connected to the RF2 port, and the RF1 port of the second switch is connected to the RFC port. When the first control signal is at a low level, the RFC port of the first switch is connected to the RF1 port, and the RF2 port of the second switch is connected to the RFC port. The third switch, the fourth switch combination, ..., the eleventh switch, the twelfth switch combination are similar, that is, in order, two adjacent switches are used as a subunit, and one control signal controls one subunit.

[0049] In the initial state, the first switch to the sixth switch are switched to the through end, and the seventh switch to the twelfth switch are switched to the amplitude unit.

[0050] When the third to sixth switches are switched to the through-end and the seventh to twelfth switches are switched to the amplitude unit, the first and second switches are switched from the through-end to the -0.5dB unit, which realizes -0.5dB negative amplitude modulation for the RF signal. ……. When the first to sixth switches are switched to the through-end and the ninth to twelfth switches are switched to the amplitude unit, the seventh and eighth switches are switched from the -0.5dB amplitude modulation unit to the through-end, which realizes +0.5dB positive amplitude modulation for the RF signal. ……. It is also possible to switch the combination of the six switches to finally realize an amplitude modulation range of -3.5dB to +3.5dB for the input RF signal.

[0051] Example 2

[0052] This embodiment applies the amplitude adjustment circuit to a multi-channel RF circuit and cooperates with other RF devices to build an RF signal amplitude test and analysis system. The RF signal test and analysis system includes existing technologies such as a DC power supply and a vector network signal analyzer. Figure 2 , which specifically includes the following:

[0053] The amplitude adjustment circuit is arranged in different channels, and the input end of the amplitude adjustment circuit is connected to the bandpass filter, and the output end of the amplitude adjustment circuit is connected to the input end of the amplifier.

[0054] First, switch all the RF switches in the amplitude modulation circuit to the initial state, use a vector network analyzer to measure the amplitude of each channel 1 to channel 4, and select the channel with the middle amplitude as the reference channel.

[0055] If the channel amplitude is smaller than the reference channel, the amplitude modulation circuit is set to an appropriate positive amplitude modulation value through digital control according to the amplitude difference value. The difference between the channel amplitude and the reference channel amplitude is minimized as much as possible. If the channel amplitude is larger than the reference channel, the amplitude modulation circuit is set to an appropriate negative amplitude modulation value through digital control according to the amplitude difference value. The difference between the channel amplitude and the reference channel amplitude is minimized as much as possible. Finally, the consistency of multi-channel amplitude is achieved.

[0056] Although the specific implementation of the utility model is described in detail in conjunction with the drawings, it should not be understood as limiting the scope of protection of this patent. Within the scope described in the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

Claims

1. An amplitude adjustment circuit applied to multiple channels, characterized in that: Including power circuit, control circuit and radio frequency circuit; The power supply circuit is connected to the radio frequency circuit and the control circuit respectively; the control circuit is connected to the radio frequency circuit, and the control circuit controls the radio frequency circuit through signals; The amplitude adjustment circuit is arranged in different channels, and the input end of the amplitude adjustment circuit is connected to the bandpass filter, and the output end of the amplitude adjustment circuit is connected to the input end of the amplifier; The radio frequency circuit includes a plurality of radio frequency switches and a plurality of amplitude modulation units; the amplitude modulation unit is an amplitude unit, the radio frequency switch is connected to the amplitude unit, and different amplitude units are selected by controlling the radio frequency switch to switch; The control circuit includes a displacement buffer; the displacement buffer is connected to the radio frequency switch and converts a serial input control signal into six parallel signal outputs to control the switching of the radio frequency switch.

2. The amplitude adjustment circuit applied to multiple channels according to claim 1, characterized in that: The radio frequency switch includes a first switch, a second switch, a third switch, a fourth switch, a fifth switch, a sixth switch, a seventh switch, an eighth switch, a ninth switch, a tenth switch, an eleventh switch and a twelfth switch; The input end of the first switch is connected to the output end of the bandpass filter, one output end of the first switch is connected to the input end of the -0.5dB amplitude unit, the output end of the -0.5dB amplitude unit and the other output end of the first switch are respectively connected to the two input ends of the second switch, and the output end of the second switch is connected to the input end of the third switch; One output end of the third switch is connected to the input end of the -1dB amplitude unit, the output end of the -1dB amplitude unit and the other output end of the third switch are respectively connected to two input ends of the fourth switch, and the output end of the fourth switch is connected to the input end of the fifth switch; One output end of the fifth switch is connected to the input end of the -2dB amplitude unit, the output end of the -2dB amplitude unit and the other output end of the fifth switch are respectively connected to two input ends of the sixth switch, and the output end of the sixth switch is connected to the input end of the seventh switch; One output end of the seventh switch is connected to the input end of the -0.5dB amplitude unit, the output end of the -0.5dB amplitude unit and the other output end of the seventh switch are respectively connected to the two input ends of the eighth switch, and the output end of the eighth switch is connected to the input end of the ninth switch; One output end of the ninth switch is connected to the input end of the -1dB amplitude unit, the output end of the -1dB amplitude unit and the other output end of the ninth switch are respectively connected to two input ends of the tenth switch, and the output end of the tenth switch is connected to the input end of the eleventh switch; One output end of the eleventh switch is connected to the input end of the -2dB amplitude unit, the output end of the -2dB amplitude unit and the other output end of the eleventh switch are respectively connected to two input ends of the twelfth switch, and the output end of the twelfth switch is connected to the input end of the amplifier.

3. The amplitude adjustment circuit applied to multiple channels according to claim 1, characterized in that: The power supply circuit includes a voltage stabilizer, and the voltage stabilizer supplies power to the control circuit and the radio frequency circuit respectively.

4. The amplitude adjustment circuit applied to multiple channels according to claim 1, characterized in that: The amplitude modulation unit is a π-type attenuator.

5. The amplitude adjustment circuit applied to multiple channels according to claim 2, characterized in that: The first switch, the second switch, the third switch, the fourth switch, the fifth switch, the sixth switch, the seventh switch, the eighth switch, the ninth switch, the tenth switch, the eleventh switch and the twelfth switch are all single-pole double-throw switches.

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