Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1987-09-09
1989-08-22
Mullins, James B.
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
323315, H03F 304
Patent
active
048599662
ABSTRACT:
A current amplifier circuit includes a first, second, third and fourth transistor, each having the same polarity. The first transistor is connected in series with the second transistor and both have the collector and base thereof electrically connected. The third and fourth transistors are connected in series and the fourth transistor has a resistor connected between the base and collector. The third transistor has its base connected to the collector of the first transistor. A bias current is applied to the collector of the first transistor and an input current to be amplified is applied to the base of the fourth transistor. An amplified output current is obtained across the collector to emitter of the third transistor. In a differential amplifier circuit, a fifth transistor having the same polarity is connected with its base connected to the collector of the fourth transistor through a resistor. Additionally a resistor is connected between the base of the third transistor and the collector of the first transistor. The differential current outputs are taken across the third transistor and fifth transistor.
REFERENCES:
patent: 3364434 (1968-01-01), Widlar
patent: 4716381 (1987-12-01), Campbell
Anraku Shinji
Fujita Toyohiko
Tsukakoshi Kunihiko
Yamakoshi Akira
Adams Bruce L.
Mullins James B.
Seikosha Co. Ltd.
Wilks Van C.
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