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Phase frequency detection circuit, charge pump phase frequency detector and phase-locked loop circuit

A technology of frequency detection circuit and frequency detector, which is applied in the field of circuits and can solve problems such as the performance degradation of detectors

Active Publication Date: 2019-05-10
HEFEI ESWIN IC TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the performance of existing PFDs is strongly affected by process, supply voltage, and temperature (PVT) variations, degrading detector performance

Method used

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  • Phase frequency detection circuit, charge pump phase frequency detector and phase-locked loop circuit
  • Phase frequency detection circuit, charge pump phase frequency detector and phase-locked loop circuit
  • Phase frequency detection circuit, charge pump phase frequency detector and phase-locked loop circuit

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Embodiment Construction

[0025] Reference herein to an "embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the present application. The occurrences of this phrase in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments. It is understood explicitly and implicitly by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0026] refer to figure 1 , figure 1 It is a schematic circuit diagram of the first embodiment of the phase and frequency detection circuit provided in this application. The phase and frequency detection circuit 10 includes a first flip-flop 11 , a second flip-flop 12 , a reset circuit 13 and a delay circuit 14 .

[0027] Wherein, the clock input terminal of the first flip-flop 11 is used to input the f...

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Abstract

The invention discloses a phase frequency detection circuit, a charge pump phase frequency detector and a phase-locked loop circuit. the phase frequency detection circuit comprises: a first trigger, wherein a clock input end of the first trigger is used for inputting a first clock signal, and a signa output end of the first trigger is used for outputting the first signal; a second trigger, whereinThe clock input end of the second trigger is used for inputting a second clock signal, and the signal output end of the second trigger is used for outputting a second signal; a reset circuit, whereinThe input end of the reset circuit is respectively coupled with the signal output end of the first trigger and the signal output end of the second trigger; a PVT insensitive delay circuit, wherein The input end of the PVT insensitive delay circuit is coupled with the output end of the reset circuit, and the output end of the PVT insensitive delay circuit is coupled with the reset input end of thefirst trigger and the reset input end of the second trigger. Through the mode, the influence of the process, the voltage and the temperature can be reduced, and the delay time change caused by PVT change can be reduced.

Description

technical field [0001] The present application relates to the field of circuit technology, in particular to a phase-frequency detection circuit, a charge pump phase-frequency detector and a phase-locked loop circuit. Background technique [0002] The PFD (Phase Frequency Detector) plays a central role in the phase synchronization circuit (PLL / DLL) as a circuit that detects the phase difference between the original CLC (phase) and the restored CLC. The PFD plays a key role in detecting the data recovery BUR because it can detect the phase difference between the data (data) input by the receiving part of the display interface and the recovery phase. [0003] However, the performance of existing PFDs is strongly affected by process, power supply voltage, and temperature (PVT) variations, degrading the performance of the detector. Contents of the invention [0004] The application mainly provides a phase-frequency detection circuit, a charge pump phase-frequency detector and ...

Claims

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Application Information

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IPC IPC(8): H03L7/081H03L7/085H03L7/18
Inventor 李东明白东勋南帐镇
Owner HEFEI ESWIN IC TECH CO LTD