Bulk-tuned Gm–C filter using current cancellation. Issue 8 (August 2015)

• Record Type: Journal Article
• Authors: Moreno, Ricardo F.L.; Barúqui, Fernando A.P.; Petraglia, Antonio
• Is Part Of: Microelectronics journal. Volume 46:Issue 8(2015)
• Page Start: 777
• Page End: 782
• Publication Date: 2015-08
• Subjects: Microelectronics -- Periodicals; Microélectronique -- Périodiques; Microelectronics; Electronic journals; Journals - contents and abstracts; Periodicals; 621.3805
• DOI: 10.1016/j.mejo.2015.05.010
• Languages: English
• ISSNs: 0959-8324

Abstract

<abstract abstract-type="author" id="ab0005"> <title id="sect0005">Abstract</title> <sec> <p id="sp0080">A new approach for small transconductance (Gm) OTA designs, suitable for relatively low frequency filtering applications in the range of few kHz, is proposed. Small <italic>Gm</italic> values are achieved by a current cancellation technique, and are adjustable by bulk driving the MOS transistors of the input differential amplifier. The OTA design procedure takes into account Pelgrom׳s modeling of mismatch errors. A common-mode feedback control circuit based on floating gate common-mode voltage detector that shares the filter main capacitances is also presented. Experimental results obtained with a low-pass filter with tunable cutoff frequency implemented in a 0.35 μm CMOS process to verify the effectiveness of the design procedure have shown close agreement with the theory.</p> </sec> </abstract>