A fast-locking delay-chain phase-locked loop

Abstract

The invention discloses a fast-locked delay chain phase-locked loop, which includes a voltage-controlled delay chain, an acceleration lock control module, a phase detector, a charge pump, and a loop filter; wherein, the voltage-controlled delay chain is connected to a clock input terminal The acceleration lock control module is connected to the voltage-controlled delay chain; the phase detector is connected to the output end of the voltage-controlled delay chain and the output end of the acceleration lock control module; the charge pump is connected to the phase detector The output terminal of the device and the output terminal of the acceleration locking control module; the loop filter is connected with the output terminal of the charge pump and the input terminal of the voltage-controlled delay chain. The delay chain phase-locked loop provided by the invention can make the system enter the locked state quickly, stably and accurately.

Description

Technical field[0001]The invention belongs to the technical field of laser radar optical signal receiver systems, and particularly relates to a fast-locking delay chain phase-locked loop.Background technique[0002]Lidar is a radar system that emits laser beams to detect the position and speed of the target and other characteristic quantities. With the development of science and technology, the application range of lidar has become more and more extensive, such as navigation and collision avoidance of automobiles or spacecraft, three-dimensional space overview scanning, weather detection, geological detection, and so on. Lidar uses a laser transmitter to emit laser light to irradiate the detected object. The laser echo reflected by the target is received by the avalanche photodiode working in linear mode and converted into a current signal, and then the avalanche photoelectric is converted by the front-end analog receiver The pulse current generated by the diode is linearly converted ...

AI Technical Summary

Problems solved by technology

See figure 1 , figure 1 It is a schematic diagram of the structure of the traditional delay chain phase-locked loop; the locking speed of the traditional delay chain phase-locked loop is relatively slow, and because the delay time of the delay chain is completely determined by the voltage control voltage, the delay time is very sensitive to the change of the voltage control voltage , that is, a very small change in the voltage control voltage will cause a large increase or decrease in the delay time, which makes the traditional delay chain phase-locked loop easy to enter the wrong locking state due to the change in the control voltage

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