Patent ID: 9584133
Date: 2017-02-28
CPC Classifications: G05F,H01L,H02M,H03K,H03L

Claim:
1. An apparatus comprising: a regulator circuit coupled to receive a first voltage and to supply a second voltage as a regulated voltage; an oscillator circuit coupled to receive the second voltage and supply an oscillator output signal; a charge pump circuit coupled to receive the second voltage and supply a third voltage larger than the second voltage to the regulator circuit, wherein the regulator circuit has a plurality of stages and wherein a first stage of the plurality of stages includes a first transistor coupled at a first current carrying terminal to an earlier one of the plurality of stages and the first transistor is coupled at a second current carrying terminal to supply the second voltage, the first stage further including a first stage operational amplifier coupled to receive the third voltage as a supply voltage and the first stage operational amplifier is coupled to receive as inputs a reference signal and the second voltage, and an output of the first stage operational amplifier is coupled to a gate of the first transistor; and a reference generator circuit coupled to supply as the reference signal a temperature sensitive reference signal to the regulator circuit, the reference signal corresponding to a voltage value of the second voltage.