A high-accuracy CMOS oversampling switched-current sample/hold (S/H) circuit using feedforward approach

This brief presents a CMOS oversampling current sample/hold (S/H) circuit using feedforward approach. The circuit adopts an integrating feedback structure which reduces the possible errors of the current copier used to sample the input current, due to clock feedthrough, channel-length modulation and...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. 2, Analog and digital signal processing Analog and digital signal processing, 1998-03, Vol.45 (3), p.395-399
Main Authors: Huang, Renyuan, Wey, Chin-Long
Format: Article
Language:English
Subjects:
Analog circuits
Applied sciences
Bandwidth
Circuit properties
Circuit stability
Clocks
Electric, optical and optoelectronic circuits
Electronic circuits
Electronics
Exact sciences and technology
Feedback circuits
Linearity
Negative feedback
Signal processing
Switching circuits
Video signal processing
Voltage
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Summary:This brief presents a CMOS oversampling current sample/hold (S/H) circuit using feedforward approach. The circuit adopts an integrating feedback structure which reduces the possible errors of the current copier used to sample the input current, due to clock feedthrough, channel-length modulation and capacitive feedback. The feedforward significantly reduces the output swing of the integrator and thus improves the stability and accuracy of the circuit. As a result, high accuracy is obtained with only first-order integration and a low oversampling ratio, and the useful bandwidth is enlarged. Simulation results show a 90-dB signal-to-distortion ratio, which is more than 20-dB improvement over a simple current copier, where the SCDN20 2-/spl mu/m CMOS process and 3.3-V supply voltage are assumed.
ISSN:1057-7130
1558-125X
DOI:10.1109/82.664248