Series resistance compensation in translinear circuits

摘要

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.