Rapid frequency switching microsystem based on integrated phase-locked loop chip

Abstract

The invention discloses a rapid frequency switching microsystem based on an integrated phase-locked loop chip. The rapid frequency switching microsystem comprises a Flash chip and an integrated phase-locked loop frequency synthesizer chip with a built-in VCO. The integrated phase-locked loop frequency synthesizer chip with the built-in VCO comprises a frequency multiplier / frequency divider, a phase frequency detector, a charge pump, a loop filter, a summing circuit, a broadband voltage-controlled oscillator, a digital to analog converter and a multimode frequency divider. The integrated phase-locked loop chip and the Flash chip form the rapid frequency switching microsystem based on the integrated phase-locked loop chip in a SiP mode. According to the microsystem, a high performance radiofrequency source signal is provided through utilization of the integrated phase-locked loop frequency synthesizer chip with the built-in VCO and a control signal stored in the Flash chip is read, so aphase-locked loop output frequency is rapidly switched. The microsystem provided by the invention is high in integration degree, the radio frequency source signal is output, a loop bandwidth is not influenced, and moreover, the locking time is greatly reduced.

Description

technical field [0001] The invention relates to a microsystem, in particular to a fast frequency switching microsystem based on an integrated phase-locked loop chip. Background technique [0002] The existing frequency source system is limited by the reference frequency, loop bandwidth, switching between multiple sub-bands, etc., usually the frequency switching time is more than 5us. For the system application of fast frequency switching, the frequency switching time may usually be as low as 1us or less. To meet this requirement, the usual solution is to use multiple phase-locked loops to select frequencies between the loops. Since the switching time of this solution is mainly determined by the switching speed, it can achieve a frequency switching time of hundreds of ns, but its disadvantages are also very obvious: one is that the complexity of the system design is greatly increased; the other is that the frequency switching needs to be known in advance The frequency point ...

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a fast frequency switching microsystem based on an integrated phase-locked loop chip, which solves the problem of long switching time of the traditional phase-locked loop frequency source system, complex fast-hopping frequency source system with fast frequency switching, limited application occasions, and difficult design However, the NVM-based frequency preset phase-locked loop data writing method is complex and difficult for practical application

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