Title:
SWITCHED CAPACITOR/CONTINUOUS TIME BUFFER CIRCUIT FOR DIGITAL/ANALOG CONVERTER
Document Type and Number:
Japanese Patent JPH0583139
Kind Code:
A
Abstract:
PURPOSE: To convert a sample data analog signal by a switched capacitor into a continuance analog signal by a D/A converter substantially without increasing distortion. CONSTITUTION: A digital input is converted into an analog value in a sample data area and then inputted to a quaternary switched capacitor/continuance buffer. This buffer has an amplifier 160 which has a switched capacitor 166 connected to its input and a feedback capacitor 174 connected across the switched capacitor 166. The input side of this capacitor 166 is switched between an input sample data voltage and the amplifier output. Consequently, those capacitors 166 and 174 reach substantially equal voltages at low frequencies, so a request for electric charges to the amplifier 160 is not present at charging time. Consequently, this amplifier 166 inputs no distortion when an output signal sampled by the switched capacitor 166 is converted into the continuance input signal of an active filter.
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Inventors:
NABUDEIIPU SHINGU SUUKU
Application Number:
JP2577592A
Publication Date:
April 02, 1993
Filing Date:
January 16, 1992
Export Citation:
Assignee:
CRYSTAL SEMICONDUCTOR CORP
International Classes:
H03H19/00; H03M1/08; H03M1/66; H03M3/02; H03M7/00; (IPC1-7): H03H19/00; H03M1/08; H03M1/66; H03M3/02
Attorney, Agent or Firm:
Koichiro Kato (2 outside)