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High-Order Temporal Moving Average Filter Using Actively-Weighted Charge Sampling  

Shin, Soo-Hwan (Department of Electrical Engineering, KAIST)
Cho, Yong-Ho (Department of Electrical Engineering, KAIST)
Jo, Sung-Hun (Department of Electrical Engineering, KAIST)
Yoo, Hyung-Joun (Department of Electrical Engineering, KAIST)
Publication Information
Journal of the Institute of Electronics Engineers of Korea SD / v.49, no.2, 2012 , pp. 47-55 More about this Journal
Abstract
A discrete-time(DT) filter with high-order temporal moving average(TMA) using actively-weighted charge sampling is proposed in this paper. To obtain different weight of sampled charge, the variable transconductance OTA is used prior to charge sampler, and the ratio of charge can be effectively weighted by switching the control transistors in the OTA. As a result, high-order TMA operation can be possible by actively-weighted charge sampling. In addition, the transconductance generated by the OTA is relatively accurate and stable by using the size ratio of the control transistors. The high-order TMA filter has small size, increased voltage gain, and low parasitic effects due to the small amount of switches and sampling capacitors. It is implemented in the TSMC $0.18-{\mu}m$ CMOS process by TMA-$2^2$. The simulated voltage gain is about 16.7 dB, and P1dB and IIP3 are -32.5 dBm and -23.7 dBm, respectively. DC current consumption is about 9.7 mA.
Keywords
DT filter; TMA; weight ratio; actively-weighted charge sampling; transconductance; control transistor;
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