Bias circuit and differential amplifier having stabilized output

Details Bias circuit and differential amplifier having stabilized output Bias circuit and differential amplifier having stabilized output

1993-11-12

1995-09-19

Heyman, John S.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific identifiable device, circuit, or system

Nonlinear amplifying circuit

327538, 327 53, 327 65, 330253, 330261, H03K 524, H03K 1716

Patent

active

054518989

ABSTRACT:
A differential circuit is provided that generates a differential output voltage .DELTA.V that does not vary when the power supply voltage changes and/or when the field effect transistor conductance changes. The bias circuit connected to the differential amplifier stabilizes the output voltage swing .DELTA.V to be insensitive to change in supply voltage and/or transconductance. A feedback loop is provided to drive the voltage to a predetermined voltage dependent upon the threshold voltage of the transistors used (e.g., the threshold voltage of a PMOS transistor). The voltage stabilizes the current source of the differential amplifier via a current mirror coupled to the feedback loop. Therefore, the resultant differential output voltage .DELTA.V is equal to the transistor threshold voltage. As the transistor threshold voltage is independent of the power supply voltage and device transconductance, the differential amplifier output .DELTA.V is stabilized against variations in power supply voltage and transconductance.

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patent: 5223743 (1993-06-01), Nakagawara
patent: 5298809 (1994-03-01), Yamaguchi
patent: 5362995 (1994-11-01), Kubo

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