Patent ID: 7911278

Claim:
A low noise implementation of a first stage electronic system for measuring currents and receiving signals from voltage-controlled sensors or detectors comprising: A) a current receiver/converter having low differential input impedance; said receiver/convertor comprising a transimpedance charge or voltage amplifier having an inverting port, a direct amplifier port, a local ground, an output port, and a feedback impedance located between the inverting port and the output port, said detector or sensor being connected to the inverting port; said local ground of the receiver/converter being connected to the direct amplifier port; B) a voltage-controlled detector or sensor having its grounded parts galvanically connected to the device ground, and its output line connected to said inverting port of said receiver/converter, providing current to said inverting port of said receiver/converter; C) a power supply circuit providing a bias voltage between said device ground and said local ground of the receiver/converter, thereby supplying the voltage necessary to control the detector or sensor upon equalization of the constant voltage levels at the local ground and said inverting port of the receiver/converter; and D) an output line connected to said output port supplying the result of detector or sensor current conversion in an appropriate form.