Output circuit having wide range frequency response characteristic
AssigneeKabushiki Kaisha Toshiba
InventorHideaki Masuoka
Life of this patent
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Abstract
An output circuit comprising a differential amplifier circuit for providing a pair of complementary output signals corresponding to an input signal supplied to first and second signal input terminals thereof, an output transistor having a base connected to one output node of the differential amplifier circuit, a collector connected to a first power source potential supply terminal, and an emitter connected to a signal output terminal, a current mirror circuit having a current input terminal connected to a current source and a current output terminal connected to the signal output terminal, and a capacitor connected between the other output node of the differential amplifier circuit and the current input terminal of the current mirror circuit.
Claims19
An output circuit having a wide range frequency response characteristic, comprising:
- input circuit means for supplying a first node with a first signal being in-phase to an input signal, and supplying a second node with a second signal being anti-phase to the input signal;
- first output circuit means, coupled to said first node, for providing a first output current which varies in response to the first signal;
- second output circuit means, coupled to said second node, for providing a second output current which is anti-phasic to said first output current and varies in response to the second signal, wherein a frequency response of the second output current with respect to the input signal is extended as a frequency of the input signal increases;
- and
- an output terminal, coupled to said first and second output circuit means, for providing a current obtained by combining said first and second output currents.
An output circuit comprising:
- a differential amplifier circuit having two output nodes for supplying an output signal across said two output nodes corresponding to a voltage difference between input signals supplied to first and second input terminals of said differential amplifier circuit;
- an NPN transistor having a base connected to one of the output nodes of said differential amplifier circuit, a collector connected to a first power source potential supplying terminal, and an emitter connected to an output signal terminal;
- a current mirror circuit having a current input terminal connected to a current source and a current output terminal connected to said output signal terminal;
- and
- a capacitor connected between the other output node of said differential amplifier circuit and the current input terminal of said current mirror circuit.
Dependencies are inferred from the claim text.