An opamp time-multiplexed topology of a third- order SigmaDelta modulator is presented in this paper. This topology implements a third-order noise transfer-function using only two opamps by sharing one opamp between second and the third integrators of the modulator. The simulated results are comparable to a low-power modulator with three separate opamps. The proposed SigmaDelta modulator is designed for a silicon microphone front-end. In the audio-band (20-20 kHz), it features a dynamic range above 80 dB, consuming 90 muWatts with a supply voltage of 1.8 V.
Jawed, S., Gottardi, M., Baschirotto, A. (2007). A low-power high dynamic-range Sigma-Delta modulator for a capacitive microphone sensor. In Research in Microelectronics and Electronics Conference, 2007. PRIME 2007. Ph.D. (pp.129-132). IEEE [10.1109/RME.2007.4401828].
A low-power high dynamic-range Sigma-Delta modulator for a capacitive microphone sensor
BASCHIROTTO, ANDREA
2007
Abstract
An opamp time-multiplexed topology of a third- order SigmaDelta modulator is presented in this paper. This topology implements a third-order noise transfer-function using only two opamps by sharing one opamp between second and the third integrators of the modulator. The simulated results are comparable to a low-power modulator with three separate opamps. The proposed SigmaDelta modulator is designed for a silicon microphone front-end. In the audio-band (20-20 kHz), it features a dynamic range above 80 dB, consuming 90 muWatts with a supply voltage of 1.8 V.
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
