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
Faculty:	Electrical Engineering, Mathematics and Computer Science (EEMCS)
Research Group:	Integrated Circuit Design (ICD)
Link to this item:	http://purl.utwente.nl/publications/14438
Official URL:	http://dx.doi.org/10.1109/4.597289
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