RF variable gain tuned output amplifier which maintains high Q i

Details RF variable gain tuned output amplifier which maintains high Q i RF variable gain tuned output amplifier which maintains high Q i

1993-04-06

1994-08-30

Mottola, Steven

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330254, H03F 345

Patent

active

053431626

ABSTRACT:
An amplifier with variable gain which maintains high Q when saturated. A resonant circuit is connected between collector outputs of a differential pair of transistors and RF chokes couple DC supply current to the transistors. The chokes have a high impedance at the desired frequency. The emitters of the differential pair of transistors couple together to form a common output which is connected to a current source. The amount of current from the current source substantially controls the gain of the amplifier. Because the resonant circuit is not shunted with a low impedance even when one of the transistors saturates, the Q of the resonant circuit is maintained.

REFERENCES:
patent: 3609556 (1971-09-01), Benson et al.
patent: 3838210 (1974-09-01), Peil
patent: 4528516 (1985-07-01), Hill
patent: 4992753 (1991-02-01), Jenson et al.
The ARRL Handbook for the Radio Amateur, Sixty-Sixth Edition, 1989, Chapter 4, pp. 4-40.

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