Low-noise active RC signal processing circuit

Details Low-noise active RC signal processing circuit Low-noise active RC signal processing circuit

2006-04-11

2006-04-11

Mottola, Steven (Department: 2817)

Amplifiers

Signal feedback

Amplifier in signal feedback path

C330S109000

Reexamination Certificate

active

07026870

ABSTRACT:
Disclosed is a low-noise active RC signal processing circuit, which comprises a feedforward section operable responsive to an input signal to provide an output at a predetermined gain, and a feedback section operable responsive to the output of the forward circuit to negatively feed back the output to the input signal of the feedforward section while giving a predetermined transfer characteristic to the output, so as to allow the processing circuit to have a transfer impedance characteristic equal to or less than the predetermined gain over the entire frequency range. The feedforward section is composed of a current-controlled voltage output circuit which includes a common-base transistor for receiving and inverting the input signal, and an emitter-follower transistor for outputting voltage, and has a transfer impedance defining the predetermined gain. The current-controlled voltage output circuit may also be constructed using an operational amplifier. Various filters, such as a bandpass, lowpass or highpass filter, can be achieved by arranging the transfer impedance characteristic. The present invention can provide an active RC signal processing circuit having a low Q-value and an excellent low-noise performance.

REFERENCES:
patent: 4030043 (1977-06-01), Hamilton
patent: 4074204 (1978-02-01), Broburg et al.
patent: 4524331 (1985-06-01), Faith
patent: 5293087 (1994-03-01), Hamano et al.
patent: 6-37586 (1994-02-01), None
Yuichiro Aomori et al.; The Institute of Electronics, Information and Communication Engineers 2001, pp. 20-21, Mar. 7, 2001. Cited in the int'l. search report.

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