Title:
SWITCHED CAPACITOR DIGITAL/ANALOG CONVERTER REDUCING HIGHER HARMONIC WAVE DISTORTION
Document Type and Number:
Japanese Patent JP3184782
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To effectively reduce higher harmonic wave distortion by utilizing an analog switch and a capacitor for a digital/analog(D/A) converting part without using any bypass capacitor.
SOLUTION: A D/A converting part 60 is composed of a reference voltage impressing part 61, digital signal input part 62 for transmitting a digital signal to a 3rd completely symmetric amplifier 63, 3rd completely symmetric amplifier 63 and respective resistor parts 64 for removing higher harmonic wave components. Then, a low-pass filter 70 is provided for reducing the higher- harmonic wave distortion by filtering the output finally outputted from the D/A converting part 60. In this case, concerning the high frequency component generated at a conventional D/A converting part, the high frequency component is removed according to the capacity of a bypass capacitor provided at the D/A converting part but in this case, the high frequency component generated at the 3rd completely symmetric amplifier 63, etc., is removed by the low-pass filter 70 while using the analog switch and the capacitor in place of the bypass capacitor so that the higher harmonic wave distortion can be reduced.
Inventors:
Shin Yon thick
Application Number:
JP15702797A
Publication Date:
July 09, 2001
Filing Date:
June 13, 1997
Export Citation:
Assignee:
Hyundai Electronics Industry Co., Ltd.
International Classes:
H03M1/66; H03H19/00; H03M1/68; H03M3/02; (IPC1-7): H03M3/02; H03H19/00; H03M1/66
Domestic Patent References:
| JP5227034A | ||||
| JP5175787A | ||||
| JP7162270A | ||||
| JP8508624A |
Attorney, Agent or Firm:
Yoshiki Hasegawa (4 outside)