Adjusting circuit for gain flatness of transmitting link

Abstract

The utility model relates to the technical field of integrated circuits, and discloses a transmitting link gain flatness adjusting circuit which comprises a signal filtering unit, and the input end of the signal filtering unit is connected with an external intermediate frequency signal; the buffer unit is in signal connection with the output end of the signal filtering unit and buffers the intermediate frequency signal; the radio frequency output unit is configured to be in signal connection with the output end of the buffer unit; the power signal generation unit is configured to be in signal connection with the output end of the radio frequency output unit and output a power regulation signal; and the gain compensation adjustment unit is configured to be connected between the output end of the buffer unit and the input end of the radio frequency output unit, is in signal connection with the power signal generation unit, generates a gain compensation signal after receiving the power adjustment signal, and outputs the gain compensation signal to the radio frequency output unit. The method and the device have the effect of improving the overall gain flatness of the transmitting link.

Description

Technical Field

[0001] This application relates to the field of integrated circuits, and particularly to an adjustment circuit for the gain flatness of a transmission link. Background Art

[0002] In a wireless communication transmission link, the total equivalent capacitance at the input port of the power amplifier gradually decreases as the frequency increases, and the equivalent impedance at the input port of the power amplifier gradually decreases, resulting in poor gain flatness of the RF module. At the same time, the impedance equivalent to the output port of the buffer becomes smaller, causing the gain of the intermediate frequency link to decrease, and the overall gain flatness of the transmission link becomes worse, and there is room for improvement. Summary of the Invention

[0003] In order to improve the overall gain flatness of the transmission link, this application provides an adjustment circuit for the gain flatness of the transmission link.

[0004] This application provides an adjustment circuit for the gain flatness of the transmission link, and adopts the following technical solutions:

[0005] An adjustment circuit for the gain flatness of a transmission link, comprising:

[0006] A signal filtering unit, the input end of the signal unit is connected to an external intermediate frequency signal;

[0007] A buffer unit, which is signal-connected to the output end of the signal filtering unit and buffers the intermediate frequency signal;

[0008] An RF output unit, configured to be signal-connected to the output end of the buffer unit;

[0009] A power signal generation unit, configured to be signal-connected to the output end of the RF output unit and output a power adjustment signal;

[0010] A gain compensation adjustment unit, configured to be connected between the output end of the buffer unit and the input end of the RF output unit, signal-connected to the power signal generation unit and generate a gain compensation signal to be output to the RF output unit after receiving the power adjustment signal.

[0011] Optionally, the signal filtering unit includes a low-pass filter.

[0012] Optionally, the buffer unit includes a buffer.

[0013] Optionally, the RF output unit includes a mixer and a power amplifier connected electrically, and the output end of the power amplifier outputs an RF signal RF.

[0014] Optionally, the power signal generation unit includes a power detector, the input end of which is electrically connected to the output end of the power amplifier and outputs the power adjustment signal.

[0015] Optionally, the gain compensation adjustment unit includes a digital control module and a variable electronic component;

[0016] The input end of the digital control module is signal-connected to the output end of the power detector, and the output end of the digital control module is signal-connected to the control port of the variable electronic component, receiving the power adjustment signal and adjusting the parameter value of the variable electronic component.

[0017] Optionally, the variable electronic component includes a variable resistor R1 and a variable capacitor C1. One end of the variable resistor R1 is electrically connected to the output end of the buffer, the other end of the variable resistor R1 is electrically connected to one end of the variable capacitor C1, and the other end of the variable capacitor C1 is grounded;

[0018] The digital control module is signal-connected to the variable resistor R1 and the variable capacitor C1, receiving the power adjustment signal and outputting a first control signal to adjust the resistance value of the variable resistor R1 and a second control signal to adjust the capacitance of the variable capacitor C1.

[0019] Optionally, one input end of the mixer is signal-connected between the variable resistor R1 and the variable capacitor C1, and the other input end of the mixer accesses the local oscillator signal.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: After receiving the power adjustment signal output by the power signal generation unit, the gain compensation adjustment unit generates a gain compensation signal and outputs it to the RF output unit, so that the gain flatness in different frequency bands can be flexibly adjusted. Compared with the general digital domain adjustment method, the adjustment module of the gain flatness is integrated in the analog domain, and the link gain flatness can be directly adjusted, and the gain flatness adjustment effect is good. Description of the Drawings

[0021] Figure 1 is a circuit module block diagram of the adjustment circuit mainly reflecting the gain flatness of the transmission link in the embodiment of the present application.

[0022] Figure 2 is a circuit connection schematic diagram of the adjustment circuit mainly reflecting the gain flatness of the transmission link in the embodiment of the present application.

[0023] Reference numerals: 1, signal filtering unit; 2, buffer unit; 3, RF output unit; 31, mixer; 32, power amplifier; 4, power signal generation unit; 5, gain compensation adjustment unit; 51, digital control module; 52, variable electronic component. Detailed implementation manners

[0024] The following details the implementation manners of the present application, and examples of the implementation manners are shown in the appended Figure 1-2 drawings.

[0025] In the description of this specification, the description with reference to the terms "certain implementation manners", "one implementation manner", "some implementation manners", "schematic implementation manners", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in connection with the implementation manner or example are included in at least one implementation manner or example of the present application. In this specification, the schematic expressions of the above terms do not necessarily refer to the same implementation manner or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more implementation manners or examples.

[0026] An embodiment of the present application discloses an adjustment circuit for the gain flatness of a transmission link. Referring to Figure 1 , it includes a signal filtering unit 1, a buffer unit 2, an RF output unit 3, a power signal generation unit 4, and a gain compensation adjustment unit 5. The output end of the signal filtering unit 1 is signal-connected to the input end of the buffer unit 2. The gain compensation adjustment unit 5 is connected between the output end of the buffer unit 2 and the input end of the RF output unit 3. The power signal generation unit 4 is signal-connected to the output end of the RF output unit 3 and outputs a power adjustment signal. The gain compensation adjustment unit 5 is signal-connected to the power signal generation unit 4, and after receiving the power adjustment signal, generates a gain compensation signal and outputs it to the RF output unit 3.

[0027] Referring to Figure 2 , in the embodiment of the present application, the signal filtering unit 1 includes a low-pass filter. The input end of the low-pass filter is connected to an external intermediate-frequency signal. The low-pass filter filters out the high-frequency signal components in the external intermediate-frequency signal, filters out possible interference, clutter, and high-frequency noise, thereby effectively improving the signal quality. The buffer unit 2 includes a buffer. The input end of the buffer is signal-connected to the output end of the low-pass filter. The buffer provides a certain isolation between the input and output to reduce interference and loss during signal transmission.

[0028] The RF output unit 3 includes a mixer 31 and a power amplifier 32 connected electrically. The output end of the power amplifier 32 outputs an RF signal RF. The power signal generation unit 4 includes a power detector. The input end of the power detector is electrically connected to the output end of the power amplifier 32 and outputs a power adjustment signal.

[0029] The gain compensation adjustment unit 5 includes a digital control module 51 and a variable electronic component 52. The input end of the digital control module 51 is signal-connected to the output end of the power detector. The output end of the digital control module 51 is signal-connected to the control port of the variable electronic component 52, receives the power adjustment signal and adjusts the parameter value of the variable electronic component 52, so as to generate a gain compensation signal and output it to the input end of the mixer 31.

[0030] Specifically, the variable electronic component 52 includes a variable resistor R1 and a variable capacitor C1. One end of the variable resistor R1 is electrically connected to the output end of the buffer, the other end of the variable resistor R1 is electrically connected to one end of the variable capacitor C1, and the other end of the variable capacitor C1 is grounded. The digital control module 51 is signal-connected to the variable resistor R1 and the variable capacitor C1, receives the power adjustment signal and outputs a first control signal to adjust the resistance value of the variable resistor R1 and a second control signal to adjust the capacitance of the variable capacitor C1. One input end of the mixer 31 is signal-connected between the variable resistor R1 and the variable capacitor C1, and the other input end of the mixer 31 is connected to the local oscillator signal.

[0031] Specifically, referring to Figure 2 , the intermediate frequency signal IF is processed by a low-pass filter to output a signal V1. The signal V1 passes through a buffer and then outputs a signal V2 to be connected to the input of the variable resistor R1. The output signal V3 of the variable resistor R1 is connected to the intermediate frequency input of the mixer 31 and the positive terminal of the variable capacitor C1. LO is the local oscillator signal externally connected to the mixer 31. The output signal V4 of the mixer 31 is connected to the input of the power amplifier 32. The capacitor C2 is the equivalent capacitance of the input port of the power amplifier 32. The output Vout of the power amplifier 32 is the RF signal; the output Vout of the power amplifier 32 is connected to the input of the power detector, and the output signal V5 of the power detector is connected to the input of the digital control module 51.

[0032] The output signal of the transmission link at a certain specific frequency is detected by the power detector. After being calculated by the digital control module 51, a resistance-capacitance array adjustment codeword is generated to adjust the values of the variable resistor R1 and the variable capacitor C1 on the link, and a gain compensation signal for different frequencies is generated. Compared with the common digital domain processing method, this circuit integrates the gain flatness adjustment module in the transmission link, the digital circuit is simple, and the gain flatness effect is good.

[0033] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present application. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. An adjustment circuit for the gain flatness of a transmission link, characterized in that, Comprising: A signal filtering unit (1), the input end of the signal filtering unit (1) is connected to an external intermediate frequency signal; A buffer unit (2), which is signal-connected to the output end of the signal filtering unit (1) and buffers the intermediate frequency signal; A radio frequency output unit (3), configured to be signal-connected to the output end of the buffer unit (2); A power signal generating unit (4), configured to be signal-connected to the output end of the radio frequency output unit (3) and output a power adjustment signal; A gain compensation adjustment unit (5), configured to be connected between the output end of the buffer unit (2) and the input end of the radio frequency output unit (3), signal-connected to the power signal generating unit (4), and generate a gain compensation signal after receiving the power adjustment signal and output it to the radio frequency output unit (3).

2. The adjustment circuit for the emission link gain flatness according to claim 1, wherein The signal filtering unit (1) includes a low-pass filter.

3. The adjustment circuit for the emission link gain flatness according to claim 1, wherein The buffer unit (2) includes a buffer.

4. The adjustment circuit for the transmission link gain flatness according to claim 3, wherein The radio frequency output unit (3) includes a mixer (31) and a power amplifier (32) connected electrically, and the output end of the power amplifier (32) outputs a radio frequency signal RF.

5. The adjustment circuit for the transmission link gain flatness according to claim 4, wherein The power signal generating unit (4) includes a power detector, the input end of the power detector is electrically connected to the output end of the power amplifier (32), and outputs the power adjustment signal.

6. The adjustment circuit for the emission link gain flatness according to claim 5, wherein The gain compensation adjustment unit (5) includes a digital control module (51) and a variable electronic component (52); The input end of the digital control module (51) is signal-connected to the output end of the power detector, the output end of the digital control module (51) is signal-connected to the control port of the variable electronic component (52), receives the power adjustment signal and adjusts the parameter value of the variable electronic component (52).

7. The adjustment circuit for the emission link gain flatness according to claim 6, characterized in that The variable electronic component (52) includes a variable resistor R1 and a variable capacitor C1, one end of the variable resistor R1 is electrically connected to the output end of the buffer, the other end of the variable resistor R1 is electrically connected to one end of the variable capacitor C1, and the other end of the variable capacitor C1 is grounded; The digital control module (51) is signal-connected to the variable resistor R1 and the variable capacitor C1, receives the power adjustment signal and outputs a first control signal to adjust the resistance value of the variable resistor R1 and a second control signal to adjust the capacitance of the variable capacitor C1.

8. The adjustment circuit for the emission link gain flatness according to claim 7, characterized in that, One input end of the mixer (31) is signal-connected between the variable resistor R1 and the variable capacitor C1, and the other input end of the mixer (31) is connected to a local oscillator signal.

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