Agere Systems Inc.

Agere Systems Guardian Corp.

Peicheng Ju

Christopher John Abel

Joseph Anidjar

A bandgap reference circuit that uses reduced substrate area while requiring relatively low voltage. The circuit may include a bipolar transistor with a resistor electrically connected across the emitter-base of the bipolar transistor. The resistor sums a first current with a second current and also generates a fractional V . The bandgap reference circuit may have a first current proportional to V , and a second current proportional to a PTAT current. An impedance booster may be incorporated into the circuit. Also disclosed is a method of regulating a voltage level using embodiments of the bandgap reference circuit.

Low voltage bandgap reference circuit

The performance of a single-bit cell in a DAC is improved by decoupling the voltage swing across the load resistors from the output of the current steering device. This can be achieved by providing for a single-bit cell having a first load resistor R and a second load resistor R a current steering circuit, and a decoupling circuit operably coupled between the current steering circuit and the resistors R R The current steering circuit steers at least part of a current I through a circuit path towards either the first resistor R or the second resistor R The decoupling circuit decouples voltage swings across the load resistors R R from the current steering circuit.

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Berkeley Heights, NJ, United States of America

Peicheng Ju