Title:
定電圧回路およびそれを用いる赤外線リモコン受信機
Document Type and Number:
Japanese Patent JP4011317
Kind Code:
B2
Abstract:
A direct current input power supply voltage Vcc is outputted to the load side via a PNP type transistor having a small Vce. A base thereof is driven by a base current from which noise is removed in a power source noise removing circuit. An input to the noise removing circuit is produced by shifting a level from the Vcc side by a direct current level shift circuit. Since an output voltage Vs varies with reference to Vcc and a voltage drop is relatively small owing to the transistor, an operation voltage on the load side can be ensured. The noise removing circuit is constituted by a gm amplifier. In order to increase a noise removing rate at low frequencies, by setting gm of a time constant C/gm to a small value, it is possible to set a capacity to a value which allows integration.
Inventors:
Seiichi Yokokawa
Takahiro Inoue
Takahiro Inoue
Application Number:
JP2001277033A
Publication Date:
November 21, 2007
Filing Date:
September 12, 2001
Export Citation:
Assignee:
Sharp Corporation
International Classes:
G05F1/10; G05F1/46; H03F3/08; H03F1/26; H03F3/347; H03H11/04
Domestic Patent References:
| JP11313478A | ||||
| JP5014074A | ||||
| JP63086913A |
Attorney, Agent or Firm:
Kenzo Hara International Patent Office