US Patent No: 7,948,412

Number of patents in Portfolio can not be more than 2000

Delta-sigma modulator

ALSO PUBLISHED AS: 20100225517

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Abstract

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The present invention provides a continuous-time delta-sigma modulator which is configured with an SC (SCR) feedback DA (103) for improving tolerance to jitter for a clock signal and operates stably by maintaining a certain feedback amount without being influenced by a change in a production process thereof or an operating temperature condition thereof. By adjusting a reference voltage Vref that determines an output voltage of the SC feedback DA (103), it is possible to feed back a certain amount of charge from the SC feedback DA (103) to a loop filter (101). Thereby, operation of the delta-sigma modulator is stabilized.

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First Claim

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Patent Owner(s)

Patent OwnerAddressTotal Patents
ASAHI KASEI EMD CORPORATIONTOKYO62

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Aiba, Yusuke Atsugi, JP 9 11

Cited Art Landscape

Patent Info (Count) # Cites Year
 
CIRRUS LOGIC, INC. (1)
* 6,744,392 Noise shapers with shared and independent filters and multiple quantizers and data converters and methods using the same 42 2002
 
INTEL MOBILE COMMUNICATIONS GMBH (1)
2006/0055,580 Controlled power source, in particular for a digital analogue converter in continuous time sigma delta modulators 2 2003
 
PANASONIC CORPORATION (1)
* 7,486,217 A/D converter 3 2007
 
SONY CORPORATION (1)
7,227,570 Solid-state image pickup device and signal processing method therefor 7 2003
 
DSP GROUP SWITZERLAND AG (1)
6,507,301 Sigma-delta modulator with an adjustable feedback factor 9 2001
 
TELEFONAKTIEBOLAGET LM ERICSSON (PUBL) (1)
* 7,414,557 Method and apparatus for feedback signal generation in sigma-delta analog-to-digital converters 13 2006
 
LANTIQ DEUTSCHLAND GMBH (1)
* 6,967,606 Loop filter for a continuous time sigma delta analog to digital converter 15 2004
 
STMICROELECTRONICS S.A. (1)
* 7,474,241 Delta-sigma modulator provided with a charge sharing integrator 1 2007
 
SYNOPSYS, INC. (1)
* 7,129,866 Method and apparatus for operating a delta sigma ADC circuit 3 2005
 
SILICON LABORATORIES INC. (1)
* 7,283,075 Delta-sigma modulator with selectable noise transfer function 2 2004
 
ANALOG DEVICES, INC. (1)
6,567,025 Multi-bit sigma-delta analog to digital converter with a variable full scale 22 2002
* Cited By Examiner

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