A low-voltage programmable-gain current-mode amplifier

Author

De Lima, Jader A.

Author_Institution

VSLI Design & Instrum. Group, Univ. Estadual Paulista, Sao Paulo, Brazil

Volume

1

fYear

2002

fDate

2002

Firstpage

33

Abstract

A CMOS low-voltage, wide-band continuous-time current amplifier is presented. Based on an open-loop topology, the circuit is composed by transresistance and transconductance stages built around triode-operating transistors. In addition to an extended dynamic range, the amplifier gain can be programmed within good accuracy by the rapport between the aspect-ratio of such transistors and tuning biases V_X and V_Y. A balanced current-amplifier according to a single 1.1 V-supply and a 0.35 μm fabrication process is designed. Simulated results from PSPICE and Bsim3v3 models indicate a programmable gain within the range 20-34 dB and a minimum break-frequency of 1 MHz @C_L=1 pF. For a 200 μA_pp-level, THD is 0.8% and 0.9% at 1 kHz and 100 kHz, respectively. Input noise is 405pA√(Hz) @20 dB-gain, which gives an SNR of 66 dB @1 MHz-bandwidth. Maximum quiescent power consumption is 56 μW.

Keywords

CMOS analogue integrated circuits; SPICE; circuit tuning; continuous time systems; current-mode circuits; differential amplifiers; harmonic distortion; integrated circuit noise; low-power electronics; 0.35 micron; 1 MHz; 1 to 100 kHz; 1.1 V; 20 to 34 dB; 56 muW; Bsim3v3; CMOS; PSPICE; SNR; THD; aspect-ratio; balanced current-amplifier; extended dynamic range; input noise; minimum break-frequency; open-loop topology; programmable-gain current-mode amplifier; quiescent power consumption; transconductance stages; transresistance; triode-operating transistors; tuning biases; wide-band continuous-time current amplifier; Broadband amplifiers; Circuit optimization; Circuit topology; Dynamic range; Energy consumption; Fabrication; Process design; SPICE; Signal to noise ratio; Transconductance;

fLanguage

English

Publisher

ieee

Conference_Titel

Electronics, Circuits and Systems, 2002. 9th International Conference on

Print_ISBN

0-7803-7596-3

Type

conf

DOI

10.1109/ICECS.2002.1045326

Filename

1045326