A low-voltage programmable-gain current-mode amplifier
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Institute of Electrical and Electronics Engineers (IEEE)
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Resumo
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 Vxand Vy. A balanced current-amplifier according to a single I. IV-supply and a 0.35μm fabrication process is designed. Simulated results from PSPiCE and Bsm3v3 models indicate a programmable gain within the range 20-34dB and a minimum break-frequency of IMHz @CL=IpF. For a 200 μApp-level, THD is 0.8% and 0.9% at IKHz and 100KHz, respectively. Input noise is 405pA√Hz @20dB-gain, which gives a SNR of 66dB @1MHz-bandwidth. Maximum quiescent power consumption is 56μ W. © 2002 IEEE.
Descrição
Palavras-chave
Amplifier gain , Continuous time , Current amplifier , Extended dynamics , Fabrication process , Gain current , Input noise , Low-voltage , Open loops , Power Consumption , Programmable gain , Simulated results , Transconductance stage , Transresistance , Wide-band , Aspect ratio , Computer simulation , Broadband amplifiers
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Inglês
Citação
Proceedings of the IEEE International Conference on Electronics, Circuits, and Systems, v. 1, p. 33-36.
