Title:
IMTERMEDIATE FREQUENCY AMPLIFIER CIRCUIT
Document Type and Number:
Japanese Patent JP2834000
Kind Code:
B2
Abstract:
PURPOSE: To reduce the feedback gain of a differential signal to improve the oscillation stability by feeding back the signal, which is obtained by compositing an in-phase output and an anti-phase output, to the input end.
CONSTITUTION: LPFs 12 and 13 have the same constitution, and signals having opposite phases and the same amplitude are generated in nodes G and F. The potential of a node H is equal to the potential obtained by dividing the signal potential of nodes F and G by resistances 4 and 5. Consequently, the signal obtained by adding two signals having opposite phases and the same amplitude and multiplying the addition result by 1/2 appears in the node H if the resistance value of the resistance 4 and that of the resistance 5 are equal to each other, and an AC signal is not generated in the node H at all, and only a DC component is fed back to an input end B of a differential amplifier 11.
More Like This:
| WO/2004/043062 | READ-OUT CIRCUIT FOR INFRARED DETECTORS. |
| WO/2016/183343 | COMPACT RESOLVER PRE-AMPLIFICATION ASSEMBLY (RPA) MODULE |
| JPH01183207 | DIFFERENTIAL AMPLIFIER CIRCUIT |
Inventors:
KAGAWA SHIGERU
Application Number:
JP16860394A
Publication Date:
December 09, 1998
Filing Date:
June 29, 1994
Export Citation:
Assignee:
NIPPON DENKI KK
International Classes:
H03F3/45; H03F1/30; H03F1/34; (IPC1-7): H03F3/45; H03F1/34
Domestic Patent References:
| JP5275942A | ||||
| JP5379358A | ||||
| JP653759A | ||||
| JP643210U | ||||
| JP5614001B2 |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)