Wide-band high-speed frequency hopping frequency synthesizer and working method thereof

Abstract

The invention belongs to the wireless communication equipment field and discloses a wide-band high-speed frequency hopping frequency synthesizer and a working method thereof. The output end of a first oscillator is connected with the reference frequency input end of a phase-locked loop circuit, the input end of a first DDS and the input end of a second DDS; the output end of the phase-locked loop circuit is connected with the input end of an active loop filter; the output end of the active loop filter is connected with the input end of a voltage-controlled oscillator; the output end of the voltage-controlled oscillator is connected with the local frequency input end of an IQ modulator; the output end of the first DDS is connected with the input end of a first filter; the output end of the first filter is connected with the I-path signal input end of the IQ modulator; the output end of the second DDS is connected with the input end of a second filter; the output end of the second filter is connected with the Q-path signal input end of the IQ modulator; and the output end of the IQ modulator is connected with the radio frequency input end of the phase locked loop circuit.

Description

technical field [0001] The invention relates to the technical field of radio communication equipment, in particular to a broadband high-speed frequency hopping frequency synthesizer and a working method thereof. Background technique [0002] The output frequency of the broadband high-speed frequency hopping frequency synthesizer can generally reach hundreds of MHz to several GHz, and the frequency conversion time is within 100μs. [0003] In order to achieve 100μs frequency conversion time, the phase detection frequency should reach several MHz or dozens of MHz, but the output frequency interval is generally 25kHz. The technical methods include single-ring fractional frequency division, DDS (Direct Digital Synthesizer, DirectDigitalSynthesizer) driving a single phase-locked loop or DDS interpolation phase-locked loop, and the earlier method of multi-ring mixing chain. [0004] The single-loop fractional frequency division circuit is simple, and there are many phase-locked l...

AI Technical Summary

Problems solved by technology

The multi-loop mixing chain method also requires fractional frequency division. To achieve a frequency conversion time of 100 μs, in principle, each loop must achieve a frequency conversion time of 100 μs. At the same time, due to the complexity of the circuit, there are few applications

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