OVER-SAMPLING TYPE A/D CONVERTER

WIPO Patent Application WO/1996/025800

A1

An over-sampling type A/D converter whose sampling frequency is higher than the frequency of the signal at the final stage. The area occupied by the chips and the power consumption are not increased even though the order of integration for noise shaping is raised. The A/D converter is provided with a plurality of capacitors (C1-C4) which are used for analog signal integration and a plurality of switches (SW6-SW21) which switch the terminals of the capacitors (C1-C4) so that a single operational amplifier (AMP 1) can execute multiple times of analog signal integration operations corresponding to the order of the analog integration for noise shaping. Thus the number of operational amplifiers required for analog integration is decreased to one.

JP2822734	[Title of Invention] Noise Shaper
JPS5283157	DELTA MOLULATION METHOD
JP3154857	INTERPOLATION NOISE SHAPING QUANTIZER AND OVERSAMPLING D/A CONVERTER CIRCUIT

OKAZAKI TAKAO (JP)
YAMAKIDO KAZUO (JP)
KITA MASATO (JP)

PCT/JP1995/000195

August 22, 1996

February 13, 1995

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HITACHI LTD (JP)
OKAZAKI TAKAO (JP)
YAMAKIDO KAZUO (JP)
KITA MASATO (JP)

H03M3/02; (IPC1-7): H03M3/02; H03H19/00

JPH0542032B2	1993-06-25
JPS6031315A	1985-02-18

TECHNICAL PAPER OF THE INST. OF ELECTRONICS AND COMMUNICATION ENGINEERS OF JAPAN CAS80-82, 22 October 1980, THE INST. OF ELECTRONICS AND COMMUNICATION ENGINEERS OF JAPAN, p. 43-48.
THE TRANSACTION OF THE INST. OF ELECTRONICS AND COMMUNICATION ENGINEERS OF JAPAN, Vol. J65-A, No. 1, 25 January 1982, THE INST. OF ELECTRONICS AND COMMUNICATION ENGINEERS OF JAPAN, p. 9-13.
IEICE TECHNICAL RESEARCH REPORT CAS87-170, 22 October 1987, DENSHI JOHO TSUSHIN GAKKAI, p. 25-30.

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