A Low-Voltage Low-Power Operational Transconductance Amplifier for High-Speed Gm-C Filters

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In this paper, a low-voltage low-power transconductor structure is proposed to be used in Gm-C Filters. Specifically, an impedance-enhancement technique has been employed in order to overcome the output-impedance reduction phenomenon in low-voltage deep-sub-micron applications. In order to illustrate the effectiveness of the proposed architecture, a 1-V 3rd–order Butterworth low-pass Gm-C filter has been designed and simulated in a 0.18-μm CMOS process. The filter has a cut-off frequency of 2.2MHz and consumes less than 1.5mW.
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Body-Driven Gain-Boosting; Flipped Voltage Follower; Gm-C Filter; Low-Voltage; Output Impedance; Transconductor

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