A low-voltage programmable-gain CMOS amplifier with very-low temperature-drift
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Data
2001-01-01
Autores
De Lima, J. A. [UNESP]
Dualibe, C. [UNESP]
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Resumo
A new topology for a LVLP variable-gain CMOS amplifier is presented. Input- and load-stage are built around triode-transconductors so that voltage-gain is fully defined by a linear relationship involving only device-geometries and biases. Excellent gain-accuracy, temperature-insensitivity; and wide range of programmability, are thus achieved. Moreover, adaptative biasing improves the common-mode voltage stability upon gain-adjusting. As an example, a 0-40dB programmablegain audio-amplifier is designed. Its performance is supported by a range of simulations. For VDD=1.8V and 20dB-nominal gain, one has Av=19.97dB, f3db=770KHz and quiescent dissipation of 378μW. Over temperatures from -25°C to 125°C, the 0. ldB-bandwidth is 52KHz. Dynamic-range is optimized to 57.2dB and 42.6dB for gains of 20dB and 40dB, respectively. THD figures correspond to -60.6dB@Vout= 1Vpp and -79.7dB@Vout= 0.5 Vpp. A nearly constant bandwidth for different gains is also attained.
Descrição
Palavras-chave
Aspect ratio, Bandwidth, CMOS integrated circuits, Computer simulation, Electric potential, Gain control, Complementary metal oxide semiconductor (CMOS) amplifiers, Low-voltage low-power circuits (LVLP) circuits, Amplifiers (electronic)
Como citar
Proceedings - IEEE International Symposium on Circuits and Systems, v. 1, p. 627-630.