High input impedance circuit and semiconductor integrated device

Details High input impedance circuit and semiconductor integrated device High input impedance circuit and semiconductor integrated device

1995-07-28

1997-06-10

Mullins, James B.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330261, 330156, 360 67, H03F 345, G11B 502

Patent

active

056380267

ABSTRACT:
A high input impedance circuit includes an amplifier such as an operational amplifier comprising transistors of a first polarity which serve as a differential pair and input of the amplifier, base of one transistor being caused to serve as a positive input terminal, base of the other transistor being caused to serve as a negative input terminal. The high input impedance circuit further includes a transistor having base connected to the positive input terminal, and a second polarity opposite to the first polarity, wherein collector of the transistor of the second polarity is connected through d.c. path to a first power supply, e.g., ground, and emitter of the transistor of the second polarity is connected through d.c. path to a second power supply, e.g., power supply voltage terminal through a resistor to apply a signal in phase with an input signal delivered to the positive input terminal to the emitter of the transistor of second polarity to thereby allow input impedance to be higher. In addition, a semiconductor device provided with such a high input impedance circuit is also provided.

REFERENCES:
patent: 4451800 (1984-05-01), Nishioka et al.
patent: 5333138 (1994-07-01), Richards et al.

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