Lock detection circuit and display equipment
A lock detection and circuit technology, applied in the direction of electrical components, power automatic control, etc., can solve the problem of inflexible adjustment of detection accuracy of lock detection circuit, and achieve the effect of improving detection accuracy
Active Publication Date: 2021-01-01
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 object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments . Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.
[0062] Such as figure 1 Shown is a schematic diagram of the structure of the phase-locked loop system. The PLL 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 lose lock. The lock detection circui...
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The invention discloses a locking detection circuit and display equipment, which are used for solving the problem that the detection precision of the locking detection circuit is inflexible to adjust.The circuit comprises a signal comparison module and a programmable counting module. A reference clock signal of a phase-locked loop is input into the first input end of the signal comparison module,a feedback clock signal of the phase-locked loop is input into the second input end inputs of the signal comparison module, a margin window selection signal for determining a margin window is input into the third input end of the signal comparison module, and the output end of the signal comparison module is connected with the first input end of the programmable counting module and used for outputting a counting enable signal according to the reference clock signal, the feedback clock signal and the margin window determined by the margin window selection signal. The second input end of the programmable counting module is connected with the reference clock signal and used for outputting a locking flag signal representing the state of the phase-locked loop according to the counting enable signal and the reference clock signal. As the margin window is determined through the margin window selection signal, compared with a fixed margin window in the prior art, the detection precision can be flexibly adjusted.
Description
technical field [0001] The invention relates to the technical field of wireless communication, in particular to a locking 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. Because of its excellent diversity, phase-locked loops have become ubiquitous in communication systems, multimedia and other fields. Phase-locked loops can be used for frequency modulation and demodulation for frequency synthesizers, clock recovery circuits, and audio decoders. In a phase-locked loop (PLL) circuit, the lock detection function is indispensable. After the PLL is locked, the lock detection circuit must provide a state transition flag for the digital circuit, which requires a stable and accurate execution A circuit for locking detection operations, and this circuit should also meet different accuracy requirements to adapt to different application scenarios. [0003] However, the d...
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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