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A fourth-order continuous-time (CT) Delta-Sigma modulator with 1.5-bit quantizer is presented in this paper. This design is targeted for audio applications that demand high resolution, low supply voltage, and low power consumption. The input-feedforward topology, with optimized coefficients, is utilized to reduce internal signal swings as well as the power consumption. A 1.5-bit quantizer with simple...
A power and area efficient continuous-time input-feedforward delta-sigma modulator (DSM) structure is proposed. The coefficients are optimized to increase the input range and reduce the power. The feedforward paths and the summer are embedded into the quantizer, hence the circuit is simplified, and the power consumption and area are reduced. The prototype chip, fabricated in a 0.13-mum CMOS technology,...
This paper presents an ultra low power system architecture for self-powered sub-mW wireless biomedical sensor devices. The proposed architecture optimizes the power consumption by employing event-based mechanism to minimize the circuit activities, adopting reconfigurable circuits to increase the system flexibility, and using asymmetric asynchronous pulse-based transceiver to reduce the power of wireless...
An ultra-low-power, low-noise sensor interface IC dedicated for bio-signal acquisition is presented in this paper. The proposed system architecture is optimized to achieve a better trade-off between power consumption and noise figure. A 0.05 ~ 200 Hz bandpass function is embedded within the front-end amplifier, and a wide bandwidth buffer is inserted between the front-end amplifier and ADC to facilitate...
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