Low dropout voltage regulator with programmable on-chip...

Details Low dropout voltage regulator with programmable on-chip... Low dropout voltage regulator with programmable on-chip...

2008-09-26

2009-11-17

Riley, Shawn (Department: 2838)

Electricity: power supply or regulation systems

Including an impedance

Thermistor or resistor

C323S297000

Reexamination Certificate

active

07619402

ABSTRACT:
A programmable voltage generator has software-programmable registers that may be decoded to generate control bits that turn on select transistors that control a variable resistor network. An external power voltage is input to a regulator transistor, which has a channel resistance controlled by a gate voltage. The channel resistance of the regulator transistor produces a regulated voltage as an output. An op amp compares a reference voltage to a feedback voltage to generate the gate voltage. The feedback voltage is taken from a tap within the variable resistor network. The variable resistor network has select transistors that select one resistor between the regulated voltage and an upper node, and that select one resistor between a lower node and ground. Switches select a tap within a series of resistors between the upper and lower nodes. Y (fine) control bits select the tap while X (coarse) control bits enable select transistors.

REFERENCES:
patent: 3612220 (1971-10-01), Hall et al.
patent: 6005374 (1999-12-01), Tasdighi
patent: 6949971 (2005-09-01), Jang
patent: 7205827 (2007-04-01), Leung et al.

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