Title:
POWER SUPPLY IMPEDANCE CONVERSION CIRCUIT
Document Type and Number:
Japanese Patent JP3862817
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To supply sufficient drive current to a connected device by making an AC input impedance at a power supply terminal theoretically infinite with respect to an AC input signal, while maintaining low a DC power supply output impedance from an input jack.
SOLUTION: This power supply impedance conversion circuit, that supplies a DC drive power, superimposed on a signal line from an input jack 1 to a device connected to an input jack, is provided with an in-phase amplifier 3 that receives an AC input signal received from the connected device via the input jack 1 and produces an AC signal with in-phase and the same amplitude as those of the AC input signal. Further, 1st and 2nd load resistors R1, R2 are connected in series between a DC power supply +E and a power supply output terminal 1b of the input jack 1 and the AC signal with the same phase, and the same amplitude as those of the AC input signal and produced from the in-phase amplifier 3 is applied to a connecting point A between the 1st and 2nd load resistors R1, R2.
Inventors:
Kimura Futo
Application Number:
JP18774897A
Publication Date:
December 27, 2006
Filing Date:
June 27, 1997
Export Citation:
Assignee:
Audio Technica Co., Ltd.
International Classes:
H04R3/00; H03H11/40; (IPC1-7): H04R3/00; H03H11/40
Domestic Patent References:
| JP5292591A | ||||
| JP8051187A |
Attorney, Agent or Firm:
Takuya Ohara
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