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특허 검색
구분 출원국
출원년도 ~ 키워드


등록 펄스 생성기 및 연속시간 시그마-델타 변조기

펄스 생성기 및 연속시간 시그마-델타 변조기
이미지 확대
김이경, 권종기, 조민형
12509152 (2009.07.24)
20100156686 (2010.06.24)
7961128 (2011.06.14)
Provided is a clock generator employed in a continuous-time sigma-delta modulator. The clock generator includes an oscillator configured to generate pulses in response to an enable signal, a counter configured to count the number of pulses generated by the oscillator and output the total pulse count, and an output circuit configured to output an inactivated output signal if the pulse count of the counter is equal to a pulse-width control bit. The oscillator includes an astable multi-vibrator. Since the astable multi-vibrator capable of generating a low-jitter pulse from a jittered clock is used as the oscillator, a signal-to-noise ratio is improved. A simple configuration using only digital circuits makes it easier to design a circuit and adjust pulse width. Moreover, according to the structure of the astable multi-vibrator, it is possible to design a circuit to optimally modulate pulse width in connection with process variations of resistors and capacitors used in the continuous-time sigma-delta modulator.
KSP 제안 키워드
Continuous-Time, Multi-vibrator, Pulse Generator, Sigma-Delta, Signal noise ratio(SNR), Signal-to-Noise, clock generator, delta modulator, digital circuit, low jitter, process variation(PV), pulse width, sigma-delta modulator