Filter circuit capable of setting various filter characteristics

Details Filter circuit capable of setting various filter characteristics Filter circuit capable of setting various filter characteristics

1998-11-30

2000-07-04

Pascal, Robert

Amplifiers

With semiconductor amplifying device

Including differential amplifier

330303, H03F 345, H03F 304

Patent

active

060844701

ABSTRACT:
In this filter circuit, the emitter of a transistor Q1 is connected to the collector of a transistor Q2, and the base of the transistor Q2 is connected to the emitter of a transistor Q3 and the collector of a transistor Q4. The base of the transistor Q4 is connected to the collector of the transistor Q2. A capacitor C1 is connected between the emitters of the transistors Q2 and Q4, and a capacitor C2 is connected between the collectors of the transistors Q2 and Q4. With this arrangement, the filter circuit consumes a small power, is hardly influenced by the parasitic capacitance, can operate at high frequencies, and has a wide dynamic range.

REFERENCES:
patent: 5225790 (1993-07-01), Noguchi et al.
patent: 5532644 (1996-07-01), Nakagawara
patent: 5912587 (1999-06-01), Mihailovits et al.

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