Amplifiers – With semiconductor amplifying device – Including differential amplifier
Patent
1996-11-14
1998-03-31
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including differential amplifier
330301, H03F 345, H03F 316
Patent
active
057342989
ABSTRACT:
An amplifying circuit is suitable for an integrated circuit that has a characteristic of low-noise, high-gain, and low-consumptive current. In the circuit, transistors or FETs are used as amplifying elements. A basic amplifying circuit employing transistors, that forms a differential pair of first and second transistors, first and second resistors connected to each collector of the first and second transistors, and a constant current source connected to a common emitter of the first and second transistors, comprises a third transistor, of which emitter is connected to a connecting point of the first and second resistors, a condenser connected between a connecting point of the first transistor and the first resistor, or a connecting point of the second transistor and the second resistor, and a base of the third transistor, and a voltage source connected to a collector of the third transistor, wherein outputs are obtained from an emitter of the third transistor.
REFERENCES:
patent: 4940949 (1990-07-01), Landi
patent: 5068621 (1991-11-01), Hayward et al.
patent: 5221909 (1993-06-01), Cole
patent: 5389891 (1995-02-01), Phillipe
Nagaya Setsuya
Sugawara Hideo
Watanabe Tominaga
Fujitsu Limited
Mottola Steven
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