Amplifiers – With semiconductor amplifying device – Including frequency-responsive means in the signal...
Patent
1996-12-19
1999-06-15
Mottola, Steven J
Amplifiers
With semiconductor amplifying device
Including frequency-responsive means in the signal...
330294, 330308, 330310, H03F 3191, H03F 308
Patent
active
059125900
ABSTRACT:
A broad-band amplifier circuit is furnished with a plurality of amplifiers with a coupling capacitor being interposed between every two adjacent amplifiers. Each coupling capacitor has a capacity large enough to prevent adverse effect of external noise. Accordingly, not only the passing of a signal having a low frequency is allowed, but also an element operable in a high frequency, such as a Schottky transistor, can be provided in each amplifier as a transistor. At least the transistor of the amplifier in the last stage is connected to a diode, so that the charges accumulated between its collector and base while the amplifier stays on are fed back and eliminated. Accordingly, the broad-band amplifier circuit can carry out a flat amplifying operation over a wide range from low to high frequency bands, and therefore, can be used for all the ASK method, IrDA1.0 method, and IrDA1.1 method. Consequently, not only the manufacturing cost, but also the size of the broad-band amplifier circuit can be reduced.
REFERENCES:
patent: 4371847 (1983-02-01), Biard et al.
patent: 4567446 (1986-01-01), Konishi
patent: 4878254 (1989-10-01), Richardson
patent: 4916409 (1990-04-01), Tracy
patent: 5166639 (1992-11-01), Green et al.
Mottola Steven J
Sharp Kabushiki Kaisha
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