Differential gain stage for low voltage supply

Details Differential gain stage for low voltage supply Differential gain stage for low voltage supply

2006-09-19

2006-09-19

Pascal, Robert (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including differential amplifier

C330S261000

Reexamination Certificate

active

07109794

ABSTRACT:
A new method and a circuit to improve the low voltage performance of a differential gain stage is achieved. The method comprises a monitoring stage and a differential stage. The monitoring stage comprises a differential transistor pair having first and second differential inputs, an upper current input, and a lower current output. In addition, a current source is connected to the upper current input, and a current load is connected to the lower current output. The differential stage comprises a differential transistor pair having first and second differential inputs, an upper current input, and first and second lower current outputs. In addition, a current source is connected to the upper current input, and first and second current loads are connected to the first and second lower current inputs. A current is forced through the monitoring stage current source. The current through the monitoring stage current source is mirrored in the differential stage current source. Current through the monitoring stage current load is mirrored through the differential transistor stage first and second current loads.

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“Low Voltage Analog Circuit Design,” by Rajput et al., in IEEE Circuits and Systems Magazine, vol. 2, No. 1, 1st Quarter 2002.

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