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A New Implementation of Constant-g, OpAmp Input Stage for CMOS Low
Voltage Applications
In this paper we propose a new implementation method for the
design of OpAmp input stage with rail-to-rail constant-g,. The
new implementation is based on processing signal currents rather
than handling DC tail currents. As a result, it is universal in that
the constant-g, can be obtained independent of input transistortypes
(MOS or Bipolar) and their operating regions (weak or
strong inversion for MOS and active for Bipolar).
To demonstrate the idea, a new MOS-type input stage has been
designed with 2-pm CMOS process and simulation results of input
stage transconductance are provided. The common mode
input voltage can even exceed the positive and the negative rails
by 300mV. |
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