Frequency-dependent harmonic-distortion analysis of a linearized cross-coupled CMOS OTA and its application to OTA-C filters Academic Article

abstract

• Recent progress of wide-band communication systems demands high-frequency circuits. Conventionally, the linearity of the operational transconductance amplifier and capacitor (OTA-C) has been analyzed using Taylor series expansion. Unfortunately, this approach does not predict the frequency-dependent linearity degradation. Thus, to properly design linearized OTAs, the frequency dependence of these coefficients must be determined. In this paper, we present a frequency-dependent harmonic-distortion analytical method applied to a linear-enhanced OTA. This OTA, which is suitable for high-frequency operation, uses three linearization techniques simultaneously: 1) attenuation through floating-gate MOS transistors; 2) source degeneration; and 3) polynomial cancellation techniques. By using the harmonic-distortion analysis, some properties on the performance of OTA are used to improve the performance of OTA-C based circuits at high frequencies. A 0.5-m CMOS OTA simulation and experimental results are shown to verify the harmonic-distortion analytical method. 2006 IEEE.

authors

• Silva-Martinez, Jose

published proceedings

• IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS I-REGULAR PAPERS

author list (cited authors)

• Chen, J. L., Sanchez-Sinencio, E., & Silva-Martinez, J.

citation count

• 72

complete list of authors

• Chen, JL||Sanchez-Sinencio, E||Silva-Martinez, J

publication date

• March 2006

publisher

• Institute of Electrical and Electronics Engineers (IEEE)  Publisher

keywords

• Cross-coupled Differential Pairs
• Floating-gate Mos (fgmos)
• Frequency-dependent Harmonic Distortion
• Linearized Ota
• Operational Transconductance Amplifier And Capacitor (ota-c) Filter

Digital Object Identifier (DOI)

• 10.1109/TCSI.2005.859575

start page

• 499

end page

• 510

volume

• 53

issue

• 3

URL

• http%3A%2F%2Fdx.doi.org%2F10.1109%2Ftcsi.2005.859575