A Low-voltage Programmable-gain Current-mode Amplifier
نویسنده
چکیده
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 VX and VY. A balanced current-amplifier according to a single 1.1Vsupply and a 0.35μm fabrication process is designed. Simulated results from PSPICE and Bsim3v3 models indicate a programmable gain within the range 20-34dB and a minimum break-frequency of 1MHz @CL=1pF. For a 200μApp-level, THD is 0.8% and 0.9% at 1KHz and 100KHz, respectively. Input noise is 405pA√Hz @20dB-gain, which gives a SNR of 66dB @1MHzbandwidth. Maximum quiescent power consumption is 56μW.
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