Isolation amplifier

An isolation amplifier comprising:

• input amplifier means for amplifying an electrical signal, said input amplifier means having input, output, power supply and input reference ground terminals, the input terminals being adapted to receive an input signal;
• output amplifier means for amplifying an electrical signal, said output amplifier means having input, output and output reference ground terminals, said reference ground terminals of said output amplifier means being isolated and independent from said input amplifier means input reference ground terminals;
• a transformer having single primary and single secondary windings;
• alternator means connected to said secondary winding for alternately presenting a voltage and a high impedance to said secondary winding;
• first switching means connected between said primary winding and the output terminal of said input amplifier means for connecting said output terminal of said input amplifier means to said primary winding when said alternator means presents a high impedance to said secondary winding and for disconnecting said output terminal of said input amplifier means from said primary winding when said alternator means presents a voltage to said secondary winding, whereby a signal appearing on said output terminal of said input amplifier means in response to a signal applied to said input terminals is alternately connected to said primary winding;
• and
• second switching means connected between said secondary winding and the input terminal of said output amplifier means for connecting said input terminal of said input amplifier means to said secondary winding when said alternator means presents a high impedance to said secondary winding and disconnecting said input terminal of said output amplifier means from said secondary winding when said alternator means presents a voltage to said winding whereby the signal appearing at said output terminal of said input amplifier is alternately coupled through said transformer to the input terminal of said output amplifier providing signal amplification from said input amplifier means to said output of said output means while isolating said input amplifier means input reference ground from said output amplifier means output reference ground.