H - Electricity – 03 – G
Patent
H - Electricity
03
G
H03G 3/20 (2006.01) H03F 1/32 (2006.01) H03F 3/45 (2006.01)
Patent
CA 2079017
The operational transconductance amplifier includes a differential amplifier with a differential pair connected to a common current source, and a control circuit for obtaining a linear input voltage versus output current characteristic by maintaining the transconductance independent of the differential and of the common mode input voltages. The control circuit includes a negative feedback circuit with a comparator or operational amplifier whose inputs are connected to the above connection point and to a reference terminal whose voltage follows that of the differential inputs, the output of the comparator controlling the current source. The slope of the linear characteristic can also be modified by changing the voltage at the reference terminal via an external input voltage terminal. An additional current mirror circuit, also controlled by the control circuit, is provided for suppressing the common mode output current in the differential pair, this current being generated by the action of the control circuit on the current source.
Sevenhans Joannes Mathilda Josephus
Van Paemel Mark Gerrit Steven Jozef
Alcatel N.v.
Robic
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