Harmonic distortion in switched-current audio memory cells

Author

Martins, Jorge M. ; Dias, Victor F.

Author_Institution

Inst. Superior Tecnico, Tech. Univ. Lisbon, Portugal

Volume

46

Issue

3

fYear

1999

fDate

3/1/1999 12:00:00 AM

Firstpage

326

Lastpage

334

Abstract

Harmonic distortion in switched-current memory cells is investigated, and closed-form equations are presented concerning the effects of threshold voltage mismatch, signal dependent output conductance, and clock injection. We show that output conductance can be the main source of distortion in basic cells, but clock injection is dominant in regulated cascode (RgC), grounded-gate regulated cascode, and Shah-Toumazou cells. Concerning the V-I converter, we show that if this is simply a resistor at the input of either a GGRgC or an RgC Shah-Toumazou cell, the resulting distortion is very low. Our results have been confirmed by SPICE simulations and by measurements made on two 1.2 μm CMOS prototype chips

Keywords

CMOS analogue integrated circuits; analogue processing circuits; analogue storage; harmonic distortion; network analysis; switched current circuits; timing; 1.2 micron; CMOS prototype chips; SI audio memory cells; Shah-Toumazou cells; V-I converter; clock injection; closed-form equations; grounded-gate regulated cascode; harmonic distortion; regulated cascode; signal dependent output conductance; switched-current audio memory cells; threshold voltage mismatch; Associate members; CMOS technology; Circuit simulation; Clocks; Equations; Harmonic distortion; Resistors; Switches; Switching circuits; Threshold voltage;

fLanguage

English

Journal_Title

Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on

Publisher

ieee

ISSN

1057-7130

Type

jour

DOI

10.1109/82.754865

Filename

754865