Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – With specific source of supply or bias voltage
Patent
1998-12-30
2000-09-19
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
With specific source of supply or bias voltage
327543, 323313, G05F 110
Patent
active
061218243
ABSTRACT:
A subcircuit including three bipolar transistors is substituted in place of a single bipolar transistor to achieve extrinsic base and emitter series resistance compensation in translinear circuits. The subcircuit substitution is applied to a Brokaw-type bandgap cell. The subcircuit substitution is applied to a current multiplier circuit, and the resulting circuit is rearranged for external control circuit efficiency. A low-voltage bandgap circuit uses an operational amplifier feedback circuit with bipolar transistors having differing emitter areas and a voltage divider to generate base voltages for a Brokaw-type bandgap cell. A proportional-to-absolute-temperature sensor circuit uses parallel two stacked bipolar transistor paths in which the bipolar transistors' emitter areas are selected to adhere to a relationship so as to provide extrinsic series base and emitter resistance compensation. A proportional-to-absolute-temperature sensor circuit and a bandgap reference circuit use parallel three stacked bipolar transistor paths in which the bipolar transistors' emitter areas are selected to adhere to a relationship so as to provide extrinsic series base and emitter resistance compensation and higher output voltage swings. A bandgap reference circuit has its output referenced to the positive supply voltage, and has stacked current branches in which all transistors have zero base-collector voltages, and are selected to adhere to a relationship so as to provide extrinsic series base and emitter resistance compensation.
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Callahan Timothy P.
Nguyen Hai L.
Opris Ion E.
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