Amplifiers – With semiconductor amplifying device – Including current mirror amplifier
Patent
1992-09-02
1994-02-08
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including current mirror amplifier
381120, H03F 321
Patent
active
052851729
ABSTRACT:
An amplifier in which a current mirror circuit 53 is formed of a transistor Q25 on the input side and a transistor Q26 on the output side. The base-emitter junction area of the transistor Q26 is set to be N (N>1) times as large as that of the transistor Q25. A parallel circuit of a resistor R25 and a capacitor C25 is connected between the base of the transistor Q25 and its bias point Q27. A resistor R26 is connected between the base of the transistor Q26 and the bias point Q27. The resistance value of the resistor R25 is set to be virtually N times as large as the resistance value of the resistor R26. When an input current i25 is supplied to the transistor Q25, an output current i26, which is N times as large as the input current, is obtained from the transistor Q26 on the output side, whereas the output current i26 is held lower than N times of the input current i25 when the frequency of the input current is high.
REFERENCES:
patent: 4866312 (1989-09-01), Kearney et al.
Okanobu Taiwa
Tomiyama Hitoshi
Eslinger Lewis H.
Maioli Jay H.
Mottola Steven
Sony Corporation
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