Amplifiers – With semiconductor amplifying device – Including gain control means
Patent
1994-01-21
1995-07-11
Mottola, Steven
Amplifiers
With semiconductor amplifying device
Including gain control means
330145, H03G 300
Patent
active
054324785
ABSTRACT:
A linear interpolation network for a continuously variable amplifier. The interpolation network includes first and second control terminals from which complementary scanning input currents are demanded. The network includes a plurality of circuit legs. Each leg includes a current source and a diode connect in series therewith. Coupled between each pair of adjacent circuit legs are first and second shunting diodes. The first shunting diode is connected between the adjacent legs to conduct current in a first direction. The second shunting diode is connected between the adjacent legs to conduct current is a second, opposite direction. The shunting diodes shunt current from the current sources to the control terminals to meet the current demands of the complementary scanning current input signals. The remaining current is sourced by one or more legs such that substantially triangular, overlapping current pulses are produced in the legs responsive to the scanning current inputs. An optional resistor can be coupled between each pair of adjacent legs to "soften" the current through the diodes and introduce a small temperature dependence. A separate rank of output transistors can be used to provide bias currents to individual transconductance stages in the variable amplifier.
REFERENCES:
patent: 3539831 (1970-11-01), Gilbert
patent: 4476538 (1984-09-01), Gilbert
patent: 5077541 (1991-12-01), Gilbert
Analog Devices Inc.
Mottola Steven
LandOfFree
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