77GHz power monitoring circuit based on detector

Abstract

The invention discloses a 77GHz power monitoring circuit based on a detector. The 77GHz power monitoring circuit comprises a W-band standard waveguide, a waveguide microstrip fin line transition structure, a 50-ohm microstrip line, a parallel coupler, an MMIC attenuator chip, a 50-ohm thin-film resistor, a detector circuit and an operational amplifier circuit. The P1 port and the P2 port of the parallel coupler can be respectively used as input and output or output and input, so that a signal transmission channel during normal work is provided; and the other small part of signals are simultaneously transmitted to a P3 port of the parallel coupler and are sent to a detector circuit to realize power monitoring. The circuit can be cascaded at the input end of a receiver to form a receiver real-time protection circuit and can also be cascaded at the output end of a transmitter to form a transmitter power real-time monitoring circuit, normal work of a transceiving front end is not affected, and performance deterioration of the receiver and the transmitter is avoided.

Description

technical field [0001] The invention specifically relates to a detector-based 77GHz power monitoring circuit, which belongs to the technical field of W-band broadband detectors. Background technique [0002] The 77GHz frequency band is located in the low-end frequency of the W-band (75-110GHz). Its advantages of short wavelength, less interference, and small circuit size make this frequency band a popular spectrum resource for applications such as foreign object detection and automotive anti-collision radar. In the radar application system, the receiver and the transmitter are two important components of the radar transceiver front end. One of the important bases for judging the practicability of the transceiver front-end project is whether it can realize the real-time self-protection of the receiver in the environment of large signal and strong interference, and whether it can realize the real-time monitoring of the transmission output power in the working state to determin...

AI Technical Summary

Problems solved by technology

The problem is that the real-time performance of power monitoring is difficult to guarantee, that is, how to obtain the detection voltage in real time through the detector circuit while the front-end of the transceiver is working normally

At present, there is no public report of relevant research, which effectively combines the detection and protection of the detector circuit with the front-end monitoring and protection of the transceiver

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