A CMOS Soft-Switched Transconductor and its application in filters

Clemens H.J. Mensink

A CMOS Soft-Switched Transconductor and its application in filters

Clemens H.J. Mensink

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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 sub-micron 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 new device in which the degeneration resistors and 'soft-switches’ are merged is discussed. Besides, a third-order 5.5 MHz low-pass filter has been realized in a 0.5 pm 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 THD is -48 dB for an input voltage of 1 Vpp.

Original language	English
Pages (from-to)	5-13
Number of pages	9
Journal	Tijdschrift van het Nederlands Elektronica- en Radiogenootschap
Volume	63
Issue number	1
Publication status	Published - 1998

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title = "A CMOS Soft-Switched Transconductor and its application in filters",

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{\textquoteright}s sub-micron processes. The transconductor relies on a differential pair with variable degeneration resistance, while the degeneration resistors are 'soft-switched{\textquoteright} by means of MOS transistors. The transconductance is continuously tunable. A new device in which the degeneration resistors and 'soft-switches{\textquoteright} are merged is discussed. Besides, a third-order 5.5 MHz low-pass filter has been realized in a 0.5 pm CMOS process using the 'soft-switched{\textquoteright} transconductor. At a 3.3 V supply voltage the filter dissipates 12 mW and the dynamic range equals 62 dB where the THD is -48 dB for an input voltage of 1 Vpp.",

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AU - Mensink, Clemens H.J.

PY - 1998

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N2 - 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 sub-micron 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 new device in which the degeneration resistors and 'soft-switches’ are merged is discussed. Besides, a third-order 5.5 MHz low-pass filter has been realized in a 0.5 pm 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 THD is -48 dB for an input voltage of 1 Vpp.

AB - 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 sub-micron 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 new device in which the degeneration resistors and 'soft-switches’ are merged is discussed. Besides, a third-order 5.5 MHz low-pass filter has been realized in a 0.5 pm 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 THD is -48 dB for an input voltage of 1 Vpp.

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