Stable voltage regulator having first-order and second-order out

Details Stable voltage regulator having first-order and second-order out Stable voltage regulator having first-order and second-order out

1998-10-16

2000-05-09

Wong, Peter S.

Electricity: power supply or regulation systems

Output level responsive

Using a three or more terminal semiconductive device as the...

323273, 323281, G05F 140

Patent

active

060608714

ABSTRACT:
A stable voltage regulator circuit of simple circuit configuration 174,222 includes a differential amplifier (M2, M3) which is powered from a supply line (1) at a nominal voltage level (Vin), by being coupled between the supply line and a return line (2). A reference device (M1) is coupled to a first input (4) of the differential amplifier (M2, M3) for defining a desired output voltage (Vca) on an output line (3) coupled to an output (6) of the differential amplifier (M2, M3). The differential amplifier (M2, M3) is coupled to the return line (2) by a varying current source (M4) which feeds a varying bias current to the differential amplifier (M2, M3) and which is controlled from the supply line (1) in accordance with variations in the nominal voltage level (Vin) on the supply line (1). The varying bias current to the differential amplifier (M2, M3) provides a first-order compensation of the output voltage (Vca) for these voltage variations on the supply line (1). A second-order compensation is provided by a feedback coupling (R7, R8) from the output line (3) to the second input (5) of the differential amplifier (M2, M3).

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