Low power circuit for amplifying a voltage without using resistors

摘要

A resistor-less amplifying circuit includes a plurality of resistor-less cells. Each cell includes a plurality of MOS transistors. Each cell generates a differential output equal to ΔVGS of two MOS transistors with a magnitude of the differential output controlled by a control voltage generated by a differential amplifier coupled to a feedback loop around a cell. In one embodiment, the resistor-less amplifying circuit is a part of a bandgap voltage reference circuit. In another embodiment, the resistor-less amplifying circuit is part of a temperature sensor circuit.

主权项

1. A resistor-less amplifying circuit configured to receive an input voltage, comprising:
a plurality of resistor-less cells comprising MOS transistors; and a closed loop around at least one cell, wherein
a value of a control voltage is adjusted, by feedback through the closed loop,each cell generates an output signal of the cell equal to a difference between gate-to-source voltages (ΔVGS) of two MOS transistors,a magnitude of ΔVGS is controlled by the control voltage, andthe magnitude of ΔVGS is made equal to the input voltage.