Electricity: power supply or regulation systems – Output level responsive – Using a three or more terminal semiconductive device as the...
Patent
1991-10-07
1993-07-13
Voeltz, Emanuel T.
Electricity: power supply or regulation systems
Output level responsive
Using a three or more terminal semiconductive device as the...
323315, G05F 156
Patent
active
052277143
ABSTRACT:
A system for regulating an output voltage to a particular value includes a control transistor which produces an output voltage when energized by an energizing voltage. A voltage divider formed as by a pair of transistors with a particular ratio of transconductances divides the magnitude of this output voltage by a ratio related to the ratio of the transconductances. The transistors in the voltage divider may be respectively CMOS n- and p- transistors. The divided output voltage is introduced to a comparator (formed as from a pair of transistors) for comparison with a fixed reference voltage obtained as from a resistance ladder energized by the energizing voltage. The comparator introduces voltages to a comparator amplifier in accordance with such comparison. The comparator amplifier may include a transistor which produces changes in a current related to changes in the divided output voltage. The comparator amplifier may further include a current mirror which provides changes in a current related to changes in the current through the amplifier transistor. The current changes in the current mirror cause changes to be produced in a voltage (e.g. error voltage) from the current mirror. These error voltage changes are introduced to the control transistor to regulate the output voltage to the particular value.
REFERENCES:
patent: 4641081 (1987-02-01), Sato et al.
patent: 4779037 (1988-10-01), LoCascio
Brooktree Corporation
Roston Ellsworth R.
Schwartz Charles H.
Voeltz Emanuel T.
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