Patent ID: 8890510
Filing Date: 2014-11-18
Classification: G01R

Abstract:
1. A method to fast detect a low voltage in the range of few μVolts, comprising the following steps: (1) providing a circuit comprising input ports for a voltage to be measured, an output port, a pre-amplifier, a second amplifier, a buffer amplifier, an arrangement of switches used for calibration of the circuit, an integrator stage with reset function, and a voltage source for calibrating the integrator stage; (2) connecting an output of the pre-amplifier to an input of the second amplifier and an output of the second amplifier to an input of the buffer amplifier and an output of the buffer amplifier to an input of the integrator stage, wherein an output of the integrator stage is the output of the circuit, (3) calibrating the pre-amplifier before each measurement of the voltage is performed; (4) start calibration of the integrator stage by providing a voltage stimulus from said voltage source to the integrator stage; (5) storing the integrated output signal of the integrator stage generated from said calibration voltage measurement; (6) setting said switches to perform the voltage measurement; (7) storing the integrated output signal of the integrator stage generated from said voltage measurement; and (8) generating an output signal of the circuit if a difference between the calibration signal and the measurement signal exceeds a defined level, wherein all errors of the circuit are eliminated by said differentially generated signal.