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Title:
AMPLIFIER WITH ITS GAIN CONTROLLED BY GAIN CONTROL VOLTAGE
Document Type and Number:
Japanese Patent JPH0786855
Kind Code:
A
Abstract:

PURPOSE: To provide an amplifier with its gain controlled by a gain control voltage whose dynamic range is wide.

CONSTITUTION: In this amplifier with its gain controlled by the gain control voltage is composed of loads 1 and 2, transistors Tr01-Tr08 and a constant current source 3 for inputting input signals between the gates of the transistors Tr01 and Tr02, outputting output signals from the terminals of the loads 1 and 2 and inputting the gain control voltage between the gates of the mutually connected transistors Tr03-Tr06 and the gates of the mutually connected transistors Tr07 and Tr08, the transistor Tr09 whose gate is connected to the gate of the transistor Tr07 is inserted between the other terminal of the load 1 and the drain of the transistor Tr07 and the transistor Tr10 whose gate is connected to the gate of the transistor Tr08 is inserted between the other terminal of the load 2 and the drain of the transistor Tr08.


Inventors:
YAMANAKA MIKINORI
MURAKAMI NORIO
Application Number:
JP1993000224875
Publication Date:
March 31, 1995
Filing Date:
September 10, 1993
Export Citation:
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Assignee:
FUJITSU LTD
International Classes:
H03F3/45; H03G3/10; H03G3/20; H03G3/30; (IPC1-7): H03G3/10; H03F3/45; H03G3/20; H03G3/30
Attorney, Agent or Firm:
井桁 貞一