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Linearization Technique for Source-Degenerated CMOS Differential Transconductors

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4 Author(s)
Monsurro, P. ; Univ. di Roma La Sapienza, Rome ; Pennisi, S. ; Scotti, G. ; Trifiletti, A.

A supplementary linearization technique for CMOS differential pairs with resistive source degeneration is proposed. The approach exploits an auxiliary (degenerated) differential pair to drive the bulk terminals of the main pair. Transistor-level simulations on a design using a 0.25-mum process and powered with 2.5 V and 1 mA, show that total harmonic distortion (THD) in the voltage-to-current conversion is decreased by 10 dB (for an input differential signal with a peak amplitude of 0.5 V and for frequencies up to 100 MHz) compared to the traditional source-degenerated transconductor. This THD improvement is achieved with a negligible increase in power consumption.

Published in:

Circuits and Systems II: Express Briefs, IEEE Transactions on  (Volume:54 ,  Issue: 10 )

Date of Publication:

Oct. 2007

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