H - Electricity – 03 – F
Patent
H - Electricity
03
F
355/22, 330/35
H03F 1/34 (2006.01) H03F 3/10 (2006.01) H03F 3/387 (2006.01)
Patent
CA 1157571
935.042 WILLIAM H. MORONG, III IMPROVED ISOLATION AMPLIFIER ABSTRACT OF THE DISCLOSURE An isolation amplifier comprising an input section coupled by a multi-winding transformer to an output section. A blocking oscillator produces in the transformer a signal comprising a positive power pulse followed by a negative flyback pulse. The flyback pulse magnitude is modulated by a half-wave diode-capacitor rectifier circuit which supplies negative supply current to an amplifier in the input section. Other half-wave diode-capacitor rectifier circuits in the input section develop (1) a positive supply voltage for the amplifier, (2) a negative feedback signal for the amplifier, and (3) a level-shifting voltage to be combined with the feed- back signal. The output section includes additional half- wave diode-capacitor rectifier circuits to develop a demodu- lation signal derived from the flyback pulse, and a bias voltage to be combined with that signal to develop an input signal for the output amplifier. -1-
367616
Analog Devices Incorporated
Westell & Hanley
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