Patent ID: 6066976
Filing Date: 2000-05-23
Classification: G01R,G06G,H03G

Abstract:
An apparatus comprising:a logarithmic amplifier constructed and arranged so as to generate at an output of the logarithmic amplifier an output voltage at a value logarithmically related to a reference current value received at an input of the logarithmic amplifier;an integrator amplifier constructed and arranged so as to generate a set of calibration references signals to the input of the logarithmic amplifier as a function of the temperature of the logarithmic amplifier, the integrator amplifier including a ramp generator that generates a ramp voltage at an output of the integrator amplifier, the ramp voltage having a rate of change that varies in accordance with an input current received at an input of the integrator amplifier; anda converting capacitor coupled in series between the output of the integrator amplifier and the input of the logarithmic amplifier for converting the ramp voltage to the reference current.