Patent ID: 8395418
Filing Date: 2013-03-12
Classification: G01R

Abstract:
1. A voltage sensing circuit comprising: a voltage to current converter having a telescopic cascode circuit with an input for receiving a modulated input voltage signal, the telescopic cascade circuit being configured to track a common mode input level of at least one input device to maintain substantially constant drain to source voltages in the at least one input device and to produce a modulated current; an integrator having an input that is operatively connected to the voltage to current converter to receive the modulated current, the integrator being configured to demodulate the modulated current and to generate a voltage sum of the demodulated current for a predetermined time period; a sample and hold amplifier having an input that is operatively coupled to the integrator to receive the voltage sum, the sample and hold amplifier being configured to sample a voltage sum received from the integrator and provide an output voltage corresponding to the voltage sum; and a first modulator having an input that is operatively connected to the sample and hold amplifier to receive the output voltage, the first modulator being configured to modulate the output voltage of the sample and hold amplifier and provide the modulated voltage as a first feedback signal to the input of the voltage to current converter.