Title:
【発明の名称】増幅回路
Document Type and Number:
Japanese Patent JP2591760
Kind Code:
B2
Abstract:
An amplifier circuit whose input stage (1) has a variable gain and a DC voltage level on its load resistor (Rc), which is stabilized with the aid of means comprising a DC current generator (S), which varies contrary to the average output current of this input stage (1) and which for this purpose supplies a complementary current (I2) on this load resistor (Rc). The stabilizing means furthermore comprise a high gain differential amplifier (A) of which an input (15) is connected to the active terminal (11) of the load resistor (Rc) and whose output signal is used for the current generator control (S) via a low-pass filter (F) such that that complementary current (I2) is applied as negative feedback to the input (15) of the differential amplifier (A). An automatic gain control device which utilizes this amplifier circuit is also shown.
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Inventors:
ARAN GERI
Application Number:
JP28859487A
Publication Date:
March 19, 1997
Filing Date:
November 17, 1987
Export Citation:
Assignee:
FUIRITSUPUSU EREKUTORONIKUSU NV
International Classes:
H03G3/30; H03G1/04; H03G3/10; H03G3/20; (IPC1-7): H03G3/30
Domestic Patent References:
| JP6276304A |
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)