Variable-gain ac amplifier

Details Variable-gain ac amplifier Variable-gain ac amplifier

H - Electricity

03

G

330/31

H03G 1/00 (2006.01)

Patent

CA 1319178

72430-89 ABSTRACT A broadband amplifier having controllable amplification and an extremely high upper frequency limit includes a single-gate field-effect transistor arranged in a common-source configuration and a variable voltage source connected to the drain terminal of the single-gate field-effect transistor. The gate terminal of the single-gate field-effect transistor is connected to RF input signals to be amplified. The drain current ID is varied by a controllable voltage; this voltage changes the gain but does not change the low resistance during the controlled process. The transconductance S of the single-gate field-effect transistor is portional to the square root of the drain current ID. Thus, two or more single-gate field-effect transistors can be connected in series to form a multiple-stage amplifier without interfering with one another.

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