CN214380821U

CN214380821U - Phase shift circuit for Ka-band radio frequency chip

Info

Publication number: CN214380821U
Application number: CN202120541096.8U
Authority: CN
Inventors: 王玉军
Original assignee: Chengdu Tiger Microwave Technology Co Ltd
Current assignee: Chengdu Tiger Microwave Technology Co Ltd
Priority date: 2021-03-16
Filing date: 2021-03-16
Publication date: 2021-10-08
Anticipated expiration: 2031-03-16

Abstract

The utility model discloses a phase shift circuit for Ka wave band radio frequency chip, including the coupler, the coupler includes first coupling portion and second coupling portion, the first end of first coupling portion is connected to signal input port through first LC network, the second end of first coupling portion is connected to first load circuit; the first end of the second coupling part is connected to the signal output port, the second end of the second coupling part is connected to the second load circuit, the first load circuit and the second load circuit comprise the same circuit structure, and the circuit structure comprises an inductor L1, an inductor L2, a variable capacitor Cv1, a variable capacitor Cv2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2. The utility model discloses can adjust through the appearance value to variable capacitance, realize LC resonant frequency and with the coupling portion between the regulation of frequency difference, because the frequency difference change can lead to the phase shift to change, so realized the function of shifting the phase.

Description

Phase shift circuit for Ka-band radio frequency chip

Technical Field

The utility model relates to a radio frequency chip of Ka wave band especially relates to a phase shift circuit for Ka wave band radio frequency chip.

Background

The radio frequency chip has very wide application in communication, particularly in Ka band and even higher frequency band, and an integrated chip is often needed for signal receiving and transmitting so as to reduce the volume of equipment;

the phase shift circuit is a component of a radio frequency chip, and the phase shift circuit integrated in the chip has insertion loss fluctuation under different phase settings; and it is difficult to maintain relatively stable input and output impedances under different phase settings, which easily affects other cascaded circuits in the signal chain.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to overcome prior art not enough, provide a phase shift circuit for Ka wave band radio frequency chip, the utility model discloses can adjust through the appearance value to variable capacitance, realize LC resonant frequency and with the coupling portion between the regulation of frequency difference, because the frequency difference change can lead to the phase shift to change, so realized the phase shift function.

The purpose of the utility model is realized through the following technical scheme: a phase shift circuit for a Ka-band radio frequency chip comprises a coupler, wherein the coupler comprises a first coupling part and a second coupling part, the first end of the first coupling part is connected to a signal input port through a first LC network, and the second end of the first coupling part is connected to a first load circuit; the second coupling section has a first end connected to the signal output port and a second end connected to the second load circuit.

Preferably, the first LC network includes an inductor Lm1 and a capacitor Cm1, one end of the inductor Lm1 is connected to the first end of the first coupling unit, the other end of the inductor Lm1 is connected to the signal input port, one end of the capacitor Cm1 is connected between the inductor Lm1 and the signal input port, and the other end of the capacitor Cm1 is grounded.

Preferably, the second LC network includes an inductor Lm2 and a capacitor Cm2, one end of the inductor Lm2 is connected to the first end of the second coupling unit, the other end of the inductor Lm2 is connected to the signal output port, one end of the capacitor Cm2 is connected between the inductor Lm2 and the signal output port, and the other end of the capacitor Cm2 is grounded.

Preferably, the first load circuit and the second load circuit comprise the same circuit structure, and the circuit structure comprises an inductor L1, an inductor L2, a variable capacitor Cv1, a variable capacitor Cv2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2;

one end of the resistor R3 is connected to a Vref port, the other end of the resistor R3 is grounded through an inductor L1, a variable capacitor Cv1 and a capacitor C1 in sequence, one end of the inductor L2 is connected to a common end of the resistor R3 and the inductor L1, and the other end of the inductor L2 is grounded through a variable capacitor Cv2 and a capacitor C2 in sequence; one end of the resistor R1 is connected between the variable capacitor Cv1 and the capacitor C1, and the other end of the resistor R1 is connected with a Vc1 port; one end of the resistor R2 is connected between the variable capacitor Cv2 and the capacitor C2, and the second end of the resistor R2 is connected to the Vc2 port;

for a circuit configuration in the first load circuit, the common terminal of the resistor R3 and the inductor L1 is connected to the second terminal of the first coupling section; for the circuit configuration in the second load circuit, the common terminal of the resistor R3 and the inductor L1 is connected to the second terminal of the second coupling section.

The utility model has the advantages that: the utility model can adjust the capacitance value of the variable capacitor to realize the adjustment of the LC resonance frequency and the frequency difference between the LC resonance frequency and the coupling part, and the phase shift function is realized because the phase shift can be caused by the frequency difference change; simultaneously the utility model discloses can keep relatively stable input and output impedance when realizing shifting the adjustment.

Drawings

Fig. 1 is a schematic view of the present invention.

Detailed Description

The technical solution of the present invention is described in further detail below with reference to the accompanying drawings, but the scope of the present invention is not limited to the following description.

As shown in fig. 1, a phase shift circuit for Ka-band rf chip includes a coupler, where the coupler includes a first coupling portion and a second coupling portion, a first end of the first coupling portion is connected to a signal input port through a first LC network, and a second end of the first coupling portion is connected to a first load circuit; the second coupling section has a first end connected to the signal output port and a second end connected to the second load circuit.

In the embodiment of the present application, the first LC network includes an inductor Lm1 and a capacitor Cm1, one end of the inductor Lm1 is connected to the first end of the first coupling unit, the other end of the inductor Lm1 is connected to the signal input port, one end of the capacitor Cm1 is connected between the inductor Lm1 and the signal input port, and the other end of the capacitor Cm1 is grounded.

In the embodiment of the present application, the second LC network includes an inductor Lm2 and a capacitor Cm2, one end of the inductor Lm2 is connected to the first end of the second coupling portion, the other end of the inductor Lm2 is connected to the signal output port, one end of the capacitor Cm2 is connected between the inductor Lm2 and the signal output port, and the other end of the capacitor Cm2 is grounded.

In the embodiment of the application, the Vc1 port and the Vc2 port are variable-capacitance control ports, and the Vref port is connected with a fixed voltage.

The principle of the utility model is as follows: in the first load circuit, the capacitance value of the variable capacitor Cv1 is controlled by the control voltage input from the Vc1 port, the capacitance value of the variable capacitor Cv2 is controlled by the control voltage input from the Vc2 port, and after the capacitance values of the variable capacitor Cv1 and the variable capacitor Cv2 are changed, the resonant frequency of the LC resonant circuit (the resonant circuit formed by the variable capacitor Cv1 and the inductor L1 and the resonant circuit formed by the variable capacitor Cv2 and the inductor L2) in which the variable capacitor Cv2 and the variable capacitor Cv2 are respectively located is also changed, and the frequency difference between the resonant frequency and the resonant frequency (from the resonant frequency of the first coupling part) input from the outside is changed correspondingly to the phase shift; similarly, in the second load circuit, the frequency difference between the LC resonance circuit resonance frequency and the resonance frequency of the external input (resonance frequency from the second coupling section) changes in accordance with the phase shift; the phase shift value can be adjusted by adjusting the frequency difference in the first load circuit or the second load circuit (or adjusting the frequency difference together); in the first load circuit or the second load circuit, the frequency difference changes depending on the capacitance values of the variable capacitor Cv1 and the variable capacitor Cv2, and the capacitance values are controlled by the voltages of the Vc1 port and the Vc2 port, so that the capacitance changes due to the voltage changes, the frequency difference changes, the phase shift changes due to the frequency difference changes, and the phase shift can be realized. In the application, an LC network consisting of Lm1 and Cm1 and an LC network consisting of Lm2 and Cm2 are applied to the input and output ports, so that impedance conversion of the input and output ports is realized, and further relatively stable input and output impedance is maintained.

It should be noted that various changes and modifications can be made by those skilled in the art without departing from the spirit and essence of the invention, and these changes and modifications should fall within the scope of the appended claims.

Claims

1. A phase shift circuit for a Ka-band radio frequency chip is characterized in that: the coupler comprises a first coupling part and a second coupling part, wherein the first end of the first coupling part is connected to the signal input port through a first LC network, and the second end of the first coupling part is connected to a first load circuit; the second coupling section has a first end connected to the signal output port and a second end connected to the second load circuit.

2. The phase shift circuit for the Ka-band rf chip of claim 1, wherein: the first LC network includes an inductor Lm1 and a capacitor Cm1, one end of the inductor Lm1 is connected to the first end of the first coupling unit, the other end of the inductor Lm1 is connected to the signal input port, one end of the capacitor Cm1 is connected between the inductor Lm1 and the signal input port, and the other end of the capacitor Cm1 is grounded.

3. The phase shift circuit for the Ka-band rf chip of claim 1, wherein: the phase shift circuit further comprises a second LC network, the second LC network comprises an inductor Lm2 and a capacitor Cm2, one end of the inductor Lm2 is connected with the first end of the second coupling part, the other end of the inductor Lm2 is connected with the signal output port, one end of the capacitor Cm2 is connected between the inductor Lm2 and the signal output port, and the other end of the capacitor Cm2 is grounded.

4. The phase shift circuit for the Ka-band rf chip of claim 1, wherein: the first load circuit and the second load circuit comprise the same circuit structure, and the circuit structure comprises an inductor L1, an inductor L2, a variable capacitor Cv1, a variable capacitor Cv2, a resistor R1, a resistor R2, a resistor R3, a capacitor C1 and a capacitor C2;