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Low-voltage high-gain differential OTA for SC circuits

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5 Author(s)
R. G. Carvajal ; Dept. de Ingenieria Electron., Seville Univ., Spain ; B. Palomo ; A. Torralba ; F. Munoz
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A new differential operational transconductance amplifier (OTA) for SC circuits that operates with a supply voltage of less than two transistor threshold voltages is presented. Its simplicity relies on the use of a low-voltage regulated cascode circuit, which achieves very high output impedance under low-voltage restrictions. The OTA has been designed to operate with a supply voltage of VDD=1.5 V, using a 0.6 μm CMOS technology with transistor threshold voltages of VTN=0.75 V and VTP=-0.85 V. Post-layout simulation results for a load capacitance (CL) of 2 pF show a 75 MHz gain-bandwidth product and 100 dB DC gain with a quiescent power consumption of 750 μW.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 16 )