CN107994871A - A kind of amplitude modulation and phase modulation circuit for fuse - Google Patents

Abstract

The invention discloses an amplitude modulation and phase modulation circuit used for a fuze, comprising: a modulation switch (2), and further comprising: a microstrip DC blocking circuit A (1), a 0π phase shifter (3) and a microstrip DC blocking circuit B (4). The microstrip DC blocking circuit A (1) plays the role of blocking DC and AC, and the microstrip DC blocking circuit B (4) also plays the role of blocking DC and passing AC, which is transmitted to the other through the microstrip DC blocking circuit B (4). The RF input port controls the phase shift of the 0π phase shifter (3); after the RF input signal passes through the microstrip DC blocking circuit A (1), it is controlled by the modulation switch (2), and then the 0π phase shifter (3) ) to control the amount of phase shift, and then output through the microstrip DC blocking circuit B (4). The 0π phase shift accuracy of the AM/PM circuit is guaranteed by the 0π phase shifter (3), which has nothing to do with the modulation switch (2), the microstrip DC blocking circuit A (1), and the microstrip DC blocking circuit B (4). After assembly No debugging is required, and a high 0π phase-shift accuracy is guaranteed.

Description

A phase modulation circuit for fuze

technical field

The invention relates to an amplitude modulation and phase modulation circuit, in particular to an amplitude modulation and phase modulation circuit used for a fuze.

Background technique

The amplitude modulation and phase modulation circuit is an important part of the fuze, and its main function is to perform amplitude modulation and 0π phase modulation on the input radio frequency signal. At present, the amplitude modulation and phase modulation circuits are mostly composed of a phase difference circuit, a synthesis circuit and two identical modulation switches. The two modulation switches are used to modulate the amplitude of the radio frequency signal. Under the control of the two modulation switches being turned on and off alternately, the differential The two 0π branches of the phase circuit and the synthesis circuit are strobed, so as to complete the 0π phase modulation of the radio frequency signal. Since the two modulation switches are respectively located on the two branches of 0π, the existence of additional phase shift inside the switch will make the phase shift accuracy of the entire circuit difficult to control, difficult to debug, and poor in consistency. The circuit is improved to meet the requirement of 0π phase shift precision for fuze 0π phase modulation.

Contents of the invention

The object of the present invention is to provide an amplitude modulation and phase modulation circuit used for a fuze, which solves the problems of low 0π phase shift precision and high debugging difficulty of the traditional phase difference type amplitude modulation and phase modulation circuit.

An amplitude modulation and phase modulation circuit for a fuze, comprising: a modulation switch, and a microstrip DC blocking circuit A, a 0π phase shifter and a microstrip DC blocking circuit B.

Both the modulating switch and the 0π phase shifter are two-port devices; both the microstrip DC blocking circuit A and the microstrip DC blocking circuit B have three ports, which are radio frequency input port, control pulse input port and radio frequency output port. The RF output terminal of the microstrip DC blocking circuit A is connected to the input terminal of the modulation switch, the output terminal of the modulation switch is connected to the input terminal of the 0π phase shifter, and the output terminal of the 0π phase shifter is connected to the input terminal of the microstrip DC blocking circuit B connect.

When working, the microstrip DC blocking circuit A plays the role of blocking DC and AC. The amplitude modulation control pulse signal is input from the control pulse input port of the microstrip DC blocking circuit A, and is transmitted to the RF output port through the microstrip DC blocking circuit A to control The on-off of the modulation switch; the microstrip DC blocking circuit B also plays the role of blocking DC and AC, the phase modulation control pulse signal is input from the control pulse input port of the microstrip DC blocking circuit B, and transmitted to the Its RF input port controls the phase shift amount of the 0π phase shifter; after the RF input signal passes through the microstrip DC blocking circuit A, it is controlled by the modulation switch, and then the 0π phase shifter controls the phase shift amount, and then passes through the microstrip blocking circuit A. Direct circuit B output. When the modulation switch is assembled, it is in close contact with the shell and the cover plate to prevent the leakage of radio frequency signals through the space and ensure the modulation depth. The 0π phase shift accuracy of the AM/PM circuit is guaranteed by the 0π phase shifter, which has nothing to do with the modulation switch, the microstrip DC blocking circuit A, and the microstrip DC blocking circuit B. No debugging is required after assembly, and the 0π phase shifting accuracy is guaranteed.

In the amplitude modulation and phase modulation circuit of the present invention, the insertion loss of the microstrip DC blocking circuit A and the microstrip DC blocking circuit B is 0.5dB, the insertion loss when the modulation switch is turned on is not more than 2dB, and the insertion loss of the phase shifter is 1.5dB. The total insertion loss of the circuit is not greater than 4.5dB, the modulation depth is greater than 90dB when the switch is turned off, and the 0π phase shift accuracy is less than ±5°, which can well meet the requirements of the fuze. Compared with the traditional phase difference amplitude modulation and phase modulation circuit, the phase shifting precision is higher, and the consistency is good, no debugging is required, and it is beneficial to mass production.

Description of drawings

Fig. 1 is a schematic structural diagram of an amplitude modulation and phase modulation circuit used for a fuze.

1. Microstrip DC blocking circuit A 2. Modulation switch 3.0π phase shifter 4. Microstrip DC blocking circuit B.

Detailed ways

An amplitude modulation and phase modulation circuit for a fuze, including: a modulation switch 2, and also includes: a microstrip DC blocking circuit A1, a 0π phase shifter 3 and a microstrip DC blocking circuit B4.

Both the modulation switch 2 and the 0π phase shifter 3 are two-port devices; the microstrip DC blocking circuit A1 and the microstrip DC blocking circuit B4 both have three ports, which are RF input port, control pulse input port and RF output port. The RF output terminal of the microstrip DC blocking circuit A1 is connected to the input terminal of the modulation switch 2, the output terminal of the modulation switch 2 is connected to the input terminal of the 0π phase shifter 3, and the output terminal of the 0π phase shifter 3 is connected to the microstrip DC blocking circuit The input terminal of B4 is connected.

When working, the microstrip DC blocking circuit A1 plays the role of blocking DC and AC. The amplitude modulation control pulse signal is input from the control pulse input port of the microstrip DC blocking circuit A1, and is transmitted to the RF output port through the microstrip DC blocking circuit A1 to control The on-off of the modulation switch 2; the microstrip DC blocking circuit B4 also plays the role of blocking DC and AC, and the phase modulation control pulse signal is input from the control pulse input port of the microstrip DC blocking circuit B4, and transmitted through the microstrip DC blocking circuit B4 to its radio frequency input port to control the phase shift amount of 0π phase shifter 3; after the radio frequency input signal passes through the microstrip DC blocking circuit A1, the on-off is controlled by the modulation switch 2, and then the phase shift amount is controlled by the 0π phase shifter 3, and then Output through the microstrip DC blocking circuit B4. When the modulation switch 2 is assembled, it is in close contact with the shell and the cover plate to prevent the radio frequency signal from leaking through the space and ensure the modulation depth. The 0π phase shift accuracy of the AM/PM circuit is guaranteed by the 0π phase shifter 3, which has nothing to do with the modulation switch 2, the microstrip DC blocking circuit A1, and the microstrip DC blocking circuit B4. No debugging is required after assembly, and the 0π phase shifting accuracy is guaranteed.

Claims (1)

1. a kind of amplitude modulation and phase modulation circuit for fuse, including：Modulation switch（2）, it is characterised in that further include：Micro-strip blocking electricity Road A（1）, 0 π phase shifters（3）With micro-strip block isolating circuit B（4）；

Modulation switch（2）With 0 π phase shifters（3）It is two end device；Micro-strip block isolating circuit A（1）With micro-strip block isolating circuit B（4） There are three ports, be respectively rf inputs mouth, control pulse input port and radio frequency output port；Micro-strip block isolating circuit A （1）RF output end and modulation switch（2）Input terminal connection, modulation switch（2）Output terminal and 0 π phase shifters（3）It is defeated Enter end connection, 0 π phase shifters（3）Output terminal and micro-strip block isolating circuit B（4）Input terminal connection；

During work, micro-strip block isolating circuit A（1）Play the role of blocking circulation exchange, amplitude adjustment control pulse signal is by micro-strip blocking Circuit A（1）Control pulse input port input, through micro-strip block isolating circuit A（1）It is transferred to radio frequency output port, control modulation Switch（2）Break-make；Micro-strip block isolating circuit B（4）Equally play the role of blocking circulation exchange, phase modulation control wave is by micro- Band block isolating circuit B（4）Control pulse input port input, through micro-strip block isolating circuit B（4）Its rf inputs mouth is transferred to, Control 0 π phase shifters（3）Phase-shift phase；Radio-frequency input signals passes through micro-strip block isolating circuit A（1）Afterwards, by modulation switch（2）Control Break-make, then by 0 π phase shifters（3）Phase-shift phase is controlled, then passes through micro-strip block isolating circuit B（4）Output；Modulation switch（2）During assembling It is in close contact with housing and cover board, prevents radiofrequency signal from, by spatial leaks, ensure that modulation depth；0 π of amplitude modulation and phase modulation circuit Phase shifting accuracy is by 0 π phase shifters（3）Ensure, with modulation switch（2）, micro-strip block isolating circuit A（1）, micro-strip block isolating circuit B（4）Equal nothing Close, without debugging after assembling, ensure that 0 π phase shifting accuracies.