Logarithmically linearly controlled variable gain amplifier

Details Logarithmically linearly controlled variable gain amplifier Logarithmically linearly controlled variable gain amplifier

1984-12-14

1986-12-09

Mullins, James B.

Amplifiers

Signal feedback

Variable impedance in feedback path varied by separate...

330282, H03G 320

Patent

active

046282769

ABSTRACT:
A variable gain amplifier of the logarithmically linear type comprises a divider for dividing a signal applied to the input terminal of the amplifier by a gain control signal. The output of the divider is applied to a first input of a subtractor, the second input of the subtractor being connected to receive the signal applied to the amplifier's input terminal to deliver a signal to the output terminal of the amplifier. The amplifier has an input-to-output characteristic given by (2.sup.n /x)-1 which is approximated to exp{2-x/(2.sup.n-2)}, where x represents the gain control signal.

REFERENCES:
patent: 3848091 (1974-11-01), Stearns et al.
patent: 3902131 (1975-08-01), Dorren
Benedetti, "Keyboard Programs the Gain of an Operational Amplifier", Electronics, vol. 50, No. 26, Dec. 22, 1977, p. 80.
Edrington, "D-A Converter Forms Programmable Gain Control", Electronics, vol. 48, No. 15, Jul. 24, 1975, p. 92.
Metz, "Combination Logic Cuts Parts in Digitally Controlled Amplifier," Electronics, Sep. 18, 1975, pp. 54, 55.

Affiliated with

Also associated with

Rating

Logarithmically linearly controlled variable gain amplifier does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Logarithmically linearly controlled variable gain amplifier, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Logarithmically linearly controlled variable gain amplifier will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1387378