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Low-voltage op amp design and differential difference amplifier design using linear transconductor with resistor input

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1 Author(s)
Lee, E.K.F. ; Dept. of Electr. Eng. & Comput. Eng., Iowa State Univ., Ames, IA, USA

This paper describes a 1-V wide-input range and high linearity transconductance input stage that uses poly resistor and input-impedance boosting technique. Using the proposed transconductor, an op amp and a differential difference amplifier (DDA) were implemented in a 1.2-μm CMOS process. The transconductor has a total harmonic distortion (THD) of less than -60 dB for an input swing of 400 mV at 10 kHz. The op amp and the DDA show a peak-to-peak output swing of 800 mV and a THD of less than -70 dB for an output swing of 600 mV at 10 kHz

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Circuits and Systems II: Analog and Digital Signal Processing, IEEE Transactions on  (Volume:47 ,  Issue: 8 )