Title:
POWER RIPPLE SUPPRESSION CIRCUIT FOR DIFFERENTIAL AMPLIFIER
Document Type and Number:
Japanese Patent JP3394116
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To reduce the fluctuation of output voltage caused by the ripples regardless of the amplification degree of a differential amplifier by providing a voltage dividing circuit which divides the voltage of the power line of the differential amplifier and a circuit which supplies the divided voltage to an inverted or non-inverted terminal.
SOLUTION: The voltage of a +B power line is divided by the impedance elements Z1 and Z3 and supplied to an inverted terminal (-) of a differential amplifier 1, and the voltage of a -B power line is divided by the impedance elements Z2 and Z3 and supplied to the inverted input terminal (-) of the amplifier 1. In such a constitution, the fluctuation components such as the ripples of both +B and -B power supplies, etc., are supplied to the inverted input terminal (-) of the amplifier 1. Thus a signal that lacks the voltage fluctuation and the in-phase component supplied to the inverted input terminal (-) emerges to the output of the amplifier 1. Therefore, it is possible to suppress the ripples superimposed on the power lines down to a desired level and the desired frequency without affecting the amplification degree of the amplifier 1.
Inventors:
Hiroyuki Sato
Okuma Ryuhiko
Okuma Ryuhiko
Application Number:
JP20837895A
Publication Date:
April 07, 2003
Filing Date:
July 24, 1995
Export Citation:
Assignee:
Kenwood Corporation
International Classes:
H03F3/45; H03F1/30; (IPC1-7): H03F3/45; H03F1/30
Domestic Patent References:
| JP4104602A | ||||
| JP6232649A | ||||
| JP6257422U | ||||
| JP56152415U |
Attorney, Agent or Firm:
Masahiro Fukuyama