A circuit and method for solving the loss of lock and wrong lock of broadband mixing phase-locked loop

Abstract

The present application discloses a circuit and method for solving the loss-of-lock and wrong-lock of broadband mixing phase-locked loops, and relates to the technical field of microwave frequency synthesis, wherein the circuit includes: a phase detector, a loop filter, a voltage-controlled oscillator, a broadband Mixer, voltage preset circuit, clamping circuit and single-pole single-throw switch; the output end of the phase detector is connected with the input end of the loop filter, and the output end of the loop filter is respectively connected with the The input end of the voltage-controlled oscillator, the output end of the voltage preset circuit, the output end of the clamping circuit are connected to one end of the single-pole single-throw switch, the other end of the single-pole single-throw switch is grounded, and the voltage-controlled oscillator The output terminal of the detector outputs a signal, and after the signal is mixed with the local oscillator input signal through the broadband mixer, a mixed intermediate frequency signal is obtained, and the mixed intermediate frequency signal is input to the other input terminal of the phase detector. The application can quickly pull the initial frequency difference of the phase-locked loop into the locking band of the frequency phase detector, effectively reducing the locking time.

Description

technical field [0001] The present application relates to the technical field of microwave frequency synthesis, and in particular, to a circuit and method for solving the loss-of-lock and mis-lock of a broadband mixing phase-locked loop. Background technique [0002] Phase-locked loop is a negative feedback technology, which controls the frequency generated by the oscillator by comparing the phase of the input signal and the output signal of the voltage-controlled oscillator, and generating a voltage proportional to the phase difference between the two signals as an error voltage. To achieve the purpose of making the output frequency equal to the input signal frequency. Phase-locked frequency synthesis technology (PLL) is to introduce phase-locked technology to realize the addition, subtraction, multiplication and division of frequencies. [0003] The currently widely used PLL frequency synthesizer is mainly composed of phase detector, loop filter, voltage controlled oscill...

AI Technical Summary

Problems solved by technology

[0005] Based on the above technical problems, the present invention proposes a circuit and method for solving the loss of lock and wrong lock of the wideband frequency mixing phase-locked loop, which solves the problems of loss of lock and wrong lock of the wideband frequency mixing phase-locked loop under various circumstances

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