Transconductance amplifier with transformer coupled forward feed
First Claim
1. The combination of a transconductance amplifier for emitting an output current to a load that is a replica of an input voltage, and means for enhancing the accuracy of such replica, said enhancing means comprising:
- (a) a current comparator comprising(i) first magnetic core means,(ii) second magnetic core means,(iii) a pair of ratio windings electro-magnetically coupled with both said core means, and(iv) detection winding means electro-magnetically coupled with the first core means but not with the second core means,(b) means connecting a first of said ratio windings in series with the output current of the transconductance amplifier,(c) a resistor connected to the second of said ratio windings to form a first series circuit,(d) means connecting such first series circuit across the input voltage of the transconductance amplifier whereby the current in said second ratio winding accurately reproduces the waveform of said input voltage, and(e) a current source for injecting into the output current of the transconductance amplifier a current proportional to an error current in the detection winding means.
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Accused Products
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.
11 Citations
11 Claims
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1. The combination of a transconductance amplifier for emitting an output current to a load that is a replica of an input voltage, and means for enhancing the accuracy of such replica, said enhancing means comprising:
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(a) a current comparator comprising (i) first magnetic core means, (ii) second magnetic core means, (iii) a pair of ratio windings electro-magnetically coupled with both said core means, and (iv) detection winding means electro-magnetically coupled with the first core means but not with the second core means, (b) means connecting a first of said ratio windings in series with the output current of the transconductance amplifier, (c) a resistor connected to the second of said ratio windings to form a first series circuit, (d) means connecting such first series circuit across the input voltage of the transconductance amplifier whereby the current in said second ratio winding accurately reproduces the waveform of said input voltage, and (e) a current source for injecting into the output current of the transconductance amplifier a current proportional to an error current in the detection winding means. - View Dependent Claims (2, 3, 4, 5, 11)
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6. The combination of a transconductance amplifier for emitting an A.C. output current to a load that is a replica of the waveform of an A.C. input voltage, and means for enhancing the accuracy of such replica, said means comprising:
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(a) a current comparator comprising (i) a first magnetic core, (ii) a second magnetic core, (iii) a pair of ratio windings electro-magnetically coupled with both said cores, (iv) a detection winding electromagnetically coupled with the first core but not with the second core, (b) means connecting a first of said ratio windings in series with the output current of the transconductance amplifier, (c) a resistor connected to the second of said ratio windings to form a first series circuit, (d) means connecting such first series circuit across the input voltage of the transconductance amplifier whereby the current in said second ratio winding accurately reproduces the waveform of said input voltage, and (e) a current source for injecting into the output current of the transconductance amplifier a current proportional to an error current in the detection winding. - View Dependent Claims (7, 8, 9, 10)
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Specification