Dutyfactor adjusting method and circuit

A technology for adjusting circuits and adjusting methods, applied in electrical components, generating electric pulses, automatic control of power, etc., can solve the problems of easy interference of signals, narrow duty cycle adjustment range, and comparators affecting judgment accuracy, etc., and achieve stability. The effect of good performance, wide adjustment range and high output precision
CN101645702AInactive Publication Date: 2010-02-10IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
IPGOAL MICROELECTRONICS (SICHUAN) CO LTD
Publication Date
2010-02-10
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention discloses a dutyfactor adjusting method and a circuit. In the invention, two symmetrical delay units with opposite control logic input differential signals INP and INN carry out relativedelay detection on the differential signals, then the delay units are connected with correlation phase detectors, then the correlation phase detectors are connected with a charge pump, the output ofthe charge pump forms a loop with the two relay units, and the dutyfactor is adjusted at last, thereby a signal with the output dutyfactor of an output unit of 1:1 is synthesized. The invention can widen the adjusting scope of the duryfactor, and can theoretically realize the output of random preset dutyfactor; the structure of an implementation circuit is completely symmetrical, and high output precision (namely dutyfactor output signal with high precision) can be realized through favorable matching and process compensation; and an equivalent model of the circuit is a first order pole circuit, and the stability is good.
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Description

technical field

[0001] The invention relates to a duty ratio circuit, in particular to a duty ratio adjustment method and circuit which utilizes a correlation phase detector to detect a duty ratio error, utilizes a charge pump to accumulate errors, and utilizes a controllable delay unit to adjust the duty ratio. Background technique

[0002] Duty cycle adjustment is particularly important for half-rate transmission clocks. The traditional duty cycle adjustment circuit is generally realized by adjusting the flipping threshold of signal transmission. By increasing or reducing the flipping threshold, the pulse width of high and low levels is changed, so as to realize Adjustment of duty cycle. Its adjustment range is limited by the inversion (rising or falling) time. Too long inversion time will make the signal susceptible to interference, and the limited inversion time makes the adjustment range of the duty cycle narrow.

[0003] For the detection of the duty cycle, the tradit...

Claims

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