Patent ID: 11949423
Assignee: FARADAY TECHNOLOGY CORPORATION
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 18:
19. An operation method of a clock and data recovery device, wherein the clock and data recovery device comprises a first phase detector, a pulse filter, a charge pump and a voltage-controlled oscillator, the operation method comprising:
receiving, by the first phase detector, a data signal and a first output signal;
generating, by the first phase detector, a first phase state signal according to the data signal and the first output signal;
adjusting, by the pulse filter, a pulse width of the first phase state signal according to a capacitance of a loop capacitor to generate a filtered signal, wherein the pulse width of the pulse of the first phase state signal is positively proportional to the capacitance of the loop capacitor;
generating, by the charge pump, a pumping signal according to the filtered signal;
generating, by the loop filter, a control signal according to the pumping signal; and
generating, by the voltage-controlled oscillator, a second output signal and adjusting a frequency of the second output signal according to the control signal, wherein the first output signal is generated according to the second output signal.