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Floating-gate-based tunable CMOS low-voltage linear transconductor and its application to HF gm-C filter design

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5 Author(s)
Munoz, F. ; Dept. de Electron. Eng., Seville Univ., Spain ; Torralba, A. ; Carvajal, R.G. ; Tombs, J.
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This paper presents a new CMOS low-voltage linear transconductor for very high frequency. It uses multiple-input floating-gate transistors in each inverter of the differential structure transconductor presented by Nauta [1992]. The proposed transconductor operates under a constant low-voltage supply as low as 1.2 V, and its transconductance and output resistance are independently tunable, as shown by experimental measurements. This architecture is suitable for use in high-frequency continuous-time filters with programmable center frequency and quality factor. Simulation results of a 10.7-MHz and Q=40 gm-C filter operating with a voltage supply of 1.4 V and with rail-to rail input swing are presented

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:48 ,  Issue: 1 )