Variable-gain amplifier with pseudo-logarithmic gain control for

Details Variable-gain amplifier with pseudo-logarithmic gain control for Variable-gain amplifier with pseudo-logarithmic gain control for

1997-06-05

1999-09-14

Mottola, Steven J.

Amplifiers

With semiconductor amplifying device

Including differential amplifier

327359, H03F 345

Patent

active

059528800

ABSTRACT:
Control circuit for generating two control currents for a variable gain amplifier having a gain which is substantially proportional to the ratio of the two control currents. For a gain control which is independent of the signal level of the variable gain amplifier an exponential control characteristic is needed. The control circuit generates a set of control currents 2*I and 2*J with a ratio which is pseudo-exponential dependent on the control parameter u.sub.c. The ideal exponential characteristic is approximated to with a second-order function of the type ((1+x)/(1-x)).sup.2 by means of a voltage-to-current converter, a first translinear loop and a second translinear loop.

REFERENCES:
patent: 3849735 (1974-11-01), Haenen et al.
patent: 5256984 (1993-10-01), Lee
patent: 5389893 (1995-02-01), Itri et al.
"A New Wide-Band Amplifier Technique", Barrie Gilbert, Member, IEEE, Journal of Solid-State Circuits, vol. SC-3, No. 4, Dec. 1968.

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