Amplifiers – Interstage coupling – Transformer coupling
Patent
1988-03-25
1989-11-28
Mottola, Steven
Amplifiers
Interstage coupling
Transformer coupling
330151, H03F 350
Patent
active
048840386
ABSTRACT:
A transconductance amplifier for emitting an output current that is a replica of a input voltage has its accuracy enhanced by a current comparator having a first magnetic core, a second magnetic core, a pair of ratio windings electromagnetically coupled with both the cores, and a detection winding electromagnetically coupled with the first core but not with the second core. A first of the ratio windings is connected in series with the output current of the transconductance amplifier. A high value resistor is connected in series with the second of the ratio windings across the input voltage of the transconductance amplifier whereby the current in the second ratio winding accurately reproduces the waveform of the input voltage. A further amplifier has its input connected to the detection winding. The output of this amplifier is so connected as to add a correcting current to the output current of the transconductance amplifier and thus provide the necessary accuracy enhancement.
REFERENCES:
patent: 3497793 (1970-02-01), Gasparini et al.
patent: 3891934 (1975-06-01), Norton et al.
Canadian Patents and Development Limited-Societe Canadienne Des
Mottola Steven
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