Small integrated microwave local oscillator signal generator

Abstract

A miniature integrated microwave local oscillator signal generator belongs to the technical field of communication. The miniature integrated microwave local oscillator signal generator comprises a crystal oscillator, an LC band pass filter, a first amplifier, a phase-locked loop chip integrated with a voltage controlled oscillator, a loop filter, a second amplifier, and a low temperature co-fired ceramic filter. The crystal oscillator is connected to the input end of the LC band pass filter. The output end of the LC band pass filter is connected to the input end of the first amplifier. The output end of the first amplifier is connected to the input end of the phase-locked loop chip. The output end of the phase-locked loop chip is connected to the input end of the second amplifier. The output end of the second amplifier is connected to the input end of the low temperature co-fired ceramic filter. The output end of the low temperature co-fired ceramic filter outwardly outputs local oscillator signals. The loop filter is in bidirectional connection with the phase-locked loop chip. The advantages are that phase noise is well inhibited, the dimension of a printed circuit board is reduced, the system reliability is improved, and consistency is improved.

Description

Technical field [0001] The invention belongs to the field of communication technology, and specifically relates to a small-scale integrated microwave local oscillator signal generator. Background technique [0002] In the communication system, the local oscillator signal has the basic function of changing the frequency, which can be said to be one of the indispensable key links in the communication system. The local oscillator signal is generated by the local oscillator circuit, and a phase-locked loop circuit is added to the local oscillator circuit to ensure extremely high stability. The stability of the local oscillator frequency is very important, otherwise it will cause the local oscillator frequency to drift and cause the consequences of not being able to watch. The phase-locked loop circuit is a feedback control circuit whose purpose is to eliminate the frequency error, referred to as the phase-locked loop. Its controlled quantity is the phase and the controlled object is...

AI Technical Summary

Problems solved by technology

At present, most of the common local oscillator signal generators use a structure that combines a phase-locked loop chip, a loop filter, and a voltage-controlled oscillator. The phase-locked loop chip, loop filter, and voltage-controlled oscillator need to be Independent power supply occupies a large volume of the printed circuit board (PCB), and the corresponding debugging process and debugging steps are also relatively complicated

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