A lock detection circuit and display device
A circuit and counting circuit technology, applied in the direction of electrical components, automatic power control, etc., can solve the problem of inflexible adjustment of the detection accuracy of the lock detection circuit, and achieve the effect of improving the detection accuracy
Active Publication Date: 2022-08-02
青岛信芯微电子科技股份有限公司
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[0004] The present invention provides a lock detection circuit and a display device to solve the problem of inflexible adjustment of the detection accuracy of the lock detection circuit in the prior art
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[0061] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.
[0062] like figure 1 As shown, it is a schematic diagram of the structure of the phase-locked loop system. The phase locked loop system mainly includes a phase frequency detector (PFD), a charge pump (CP), a loop filter (LPF), a voltage controlled oscillator (VCO), a frequency divider (DIV) and a lock detection circuit.
[0063] When the system is working, various jitters of the system can cause the phase-locked loop to ...
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The invention discloses a lock detection circuit and a display device, which are used to solve the problem of inflexible adjustment of detection accuracy of the lock detection circuit. The circuit includes a signal comparison module and a programmable counting module; the first input terminal of the signal comparison module is input with the reference clock signal of the phase-locked loop, the second input terminal is input with the feedback clock signal of the phase-locked loop, and the third input terminal is input for determining The margin window selection signal of the margin window, the output terminal is connected to the first input terminal of the programmable counting module, and is used to output the count according to the reference clock signal, the feedback clock signal and the margin window determined by the margin window selection signal The enable signal, the second input terminal of the programmable counting module is connected with the reference clock signal, and is used for outputting a lock flag signal representing the state of the phase-locked loop according to the count enable signal and the reference clock signal. Since the margin window is determined by the margin window selection signal, compared with the fixed margin window in the prior art, the detection accuracy can be flexibly adjusted.
Description
technical field [0001] The present invention relates to the technical field of wireless communication, in particular to a lock detection circuit and a display device. Background technique [0002] A phase locked loop is a feedback system that compares the output phase to the input phase. Phase-locked loops have become ubiquitous in communication systems, multimedia and other fields because of their excellent diversity. Phase-locked loops can be used for frequency modulation and demodulation, used in frequency synthesizers, clock recovery circuits, and audio decoders. In the phase-locked loop (PLL) circuit, the lock detection function is indispensable. After the phase-locked loop is locked, the lock detection circuit needs to provide a state transition flag for the digital circuit, which requires a stable and accurate execution. The circuit for lock detection operation, and this circuit should also meet different accuracy requirements to adapt to different application scena...
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IPC IPC(8): H03L7/18
CPCH03L7/18
Inventor 曲维淼傅懿斌
Owner 青岛信芯微电子科技股份有限公司