Analysis and Compensation of Log-Domain Biquadratic Filter Response Deviations due to Transistor Nonidealities

Authors: Leung V.W.¹; Roberts G.W.²

Source: Analog Integrated Circuits and Signal Processing, Volume 22, Numbers 2-3, March 2000 , pp. 147-162(16)

Publisher: Springer

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Abstract:

A translinear log-domain integrator, the powerhouse of log-domain filtering techniques, is analyzed to determine its deviations due to major time-invariant bipolar transistor imperfections, such as parasitic emitter and base resistances, finite beta, Early effect, and area mismatches. The results are used to predict the transfer function deviations of biquad filters, for both lowpass and bandpass filter responses. It will be shown that the errors can be understood and categorized into integrator scalar and negative feedback errors, and how they can be electronically compensated. SPICE simulations, both large and small-signal analysis, are performed to verify the results.

Keywords: analog integrated circuits; companding; continuous-time filters; log-domain; translinear; bipolar transistors; nonideality analysis

Language: English

Document Type: Regular paper

Affiliations: 1: Analog Devices, NJ Design Center, 285 Davidson Avenue, Suite 402, Somerset, New Jersey 08873, USA vincent.leung@analog.com 2: Microelectronics and Computer Systems Laboratory, Department of Electrical Engineering, McGill University, 3480 University St. Montreal, Quebec, Canada H3A 2A7 roberts@macs.ee.mcgill.ca

Publication date: 2000-03-01