A 0.5V Bulk-Input Operational Transconductance Amplifier with Improved Common-Mode Feedback

Trakimas, Michael; Sonkusale, Sameer

doi:10.1109/iscas.2007.378724

Cited by 15 publications

(1 citation statement)

References 8 publications

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“…The common mode feedback circuit [11] for the auxiliary sub-threshold amplifier discussed above is shown in Fig. 4 The expected common mode output voltage, which is equal to the input common mode voltage, is applied to Mc3 and Mc4 generating a corresponding current I o,cm .…”

Section: Common Mode Feedback Circuitmentioning

confidence: 99%

Ultra low power PVT independent sub-threshold gm-C filters for low frequency biomedical applications

Agarwal

Sonkusale

2010

Analog Integr Circ Sig Process

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An ultra low power gm-C filter for low cut-off frequency bio-medical implantable applications is presented in this paper. The design is based on a novel trans-conductance stage operating in the sub-threshold region with a PVT independent fixed replica gm biasing circuit. The significant variation in gm with respect to temperature due to channel length modulation is corrected using a parallel combination of two gm blocks of different value. The circuit performance remains nearly constant for a supply voltage range of 1.1-1.7 V. A general biquad filter has been implemented and simulations show about 1% variation in the 3-dB bandwidth (in the range of few hertz) for a temperature range of -30 to 110°C. The circuit has been implemented using 0.5 lm CMOS technology with a nominal supply voltage of 1.2 V and power consumption for each gm block is 55.3 nW.

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Section: Common Mode Feedback Circuitmentioning

confidence: 99%