Patent ID: 7786792
Filing Date: 2010-08-31
Classification: G05F

Abstract:
1. A circuit for generating a reference voltage, the circuit comprising: an amplifier comprising an inverting input, a non-inverting input and a current output; an integrator configured to integrate a charge from an input and to produce an output having a voltage proportional to the integrated charge; a voltage buffer configured to produce one or more outputs in response to the integrated voltage; a diode junction voltage generator configured to produce a first diode junction voltage in response to a first bias current density, and to produce a second diode junction voltage in response to a second bias current density, wherein the first bias current density is higher than the second bias current density; a first composite voltage generator configured to generate a first composite voltage comprising at least a fraction of the first and/or second diode junction voltage; a first capacitor having first terminal and a second terminal, the second terminal coupled to the amplifier inverting input; and a plurality of switches configured to alternate between a first mode of operation and a second mode of operation, wherein: