A CMOS continuous-time Gm-C filter and programmable gain amplifier for WPAN receivers

This paper describes a low-voltage and low-power channel selection analog front end with continuous-time low pass filters and highly linear programmable-gain amplifier (PGA). The filters were realized as balanced Gm-C biquadratic filters to achieve low current consumption. High linearity and constan...

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Bibliographic Details
Main Authors: Yeon Kug Moon, Hae-Moon Seo, Kwang-Ho Won, Yong-Kuk Park, Myung-Hyun Yoon, June-Jae Yoo, Seong-Dong Kim
Format: Conference Proceeding
Language:English
Subjects:
Band pass filters
Bandwidth
Channel selection filters
Circuit optimization
CMOS process
DC offset
Electronics packaging
Linearity
Low pass filters
programmable gain amplifier
Signal to noise ratio
Transconductance
tuning circuit
Voltage
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Summary:This paper describes a low-voltage and low-power channel selection analog front end with continuous-time low pass filters and highly linear programmable-gain amplifier (PGA). The filters were realized as balanced Gm-C biquadratic filters to achieve low current consumption. High linearity and constant wide bandwidth are achieved by using a new transconductance (Gm) cell. The PGA has a voltage gain varying from 0 to 65dB, while maintaining a constant bandwidth. A filter tuning circuit that requires an accurate time base but no external components is presented. With a 1-Vrms differential input and output, the filter achieves -85dB THD and a 78dB signal-to-noise ratio. Both the filter and PGA were implemented in a 0.18mum 1P6M n-well CMOS process. They consume 3.2mW from a 1.8V power supply and occupy an area of 0.19mm 2
ISSN:2162-7541
2162-755X
DOI:10.1109/ICASIC.2005.1611398