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Current-feedback source-degenerated CMOS transconductor with very high linearity

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2 Author(s)
Worapishet, A. ; Mahanakorn Microelectron. Res. Centre, Mahanakorn Universiiy of Technol., Bangkok, Thailand ; Naphaphan, C.

A highly linear current-feedback (CF) transconductor with resistive source-degeneration is developed in CMOS technology. It consists of a differential source follower cascaded with a classical source-degenerated transconductor with its drain current fed back to modulate the bias of the source follower for nonlinearity cancellation, yielding an overall linear transfer function in the circuit. Designed using a 0.35 μm CMOS process for a continuous-time delta-sigma application, the CF transconductor achieves a total harmonic distortion better than -80 dB up to 1 MHz for a 0.8 V input differential voltage while the supply voltage is 2.5 V and the power consumption is 3.4 mW.

Published in:

Electronics Letters  (Volume:39 ,  Issue: 1 )

Date of Publication:

9 Jan. 2003

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