A CMOS 'Soft-Switched' transconductor and its application in gain control and filters


Mensink, Clemens H.J. and Nauta, Bram and Wallinga, Hans (1997) A CMOS 'Soft-Switched' transconductor and its application in gain control and filters. IEEE journal of solid-state circuits, 32 (7). pp. 989-997. ISSN 0018-9200

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Abstract:This paper presents a transconductor suitable for implementation in submicron CMOS technology. The transconductor is nearly insensitive for the second-order effects of the MOS transistors, which become more and more prevalent in today's submicron processes. The transconductor relies on a differential pair with variable degeneration resistance, while the degeneration resistors are “soft-switched” by means of MOS transistors. The transconductance is continuously tunable. A transconductor, using a device in which the degeneration resistors and “soft switches” are merged, is optimized for a maximum tuning range and can be used in variable gain stages like in an automatic gain control (AGC) circuit. Besides, a third-order 5.5 MHz low-pass filter has been realized in a 0.5-μm CMOS process using the “soft-switched” transconductor. At a 3.3 V supply voltage the filter dissipates 12 mW and the dynamic range equals 62 dB where the total harmonic distortion (THD) is -48 dB for an input voltage of 1 Vpp.
Item Type:Article
Copyright:© 1997 IEEE
Electrical Engineering, Mathematics and Computer Science (EEMCS)
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Link to this item:http://purl.utwente.nl/publications/14438
Official URL:https://doi.org/10.1109/4.597289
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