US Patent No: 7,948,412
Number of patents in Portfolio can not be more than 2000
Delta-sigma modulator
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May 24, 2011
Issued date -
Aug 21, 2007
filing date -
12/279,918
serial no -
In Force
status
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Abstract
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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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 6,567,025 Multi-bit sigma-delta analog to digital converter with a variable full scale | 19 | 2002 | |
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| 6,744,392 Noise shapers with shared and independent filters and multiple quantizers and data converters and methods using the same | 34 | 2002 | |
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| 6,507,301 Sigma-delta modulator with an adjustable feedback factor | 8 | 2001 | |
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| 2006/0055,580 Controlled power source, in particular for a digital analogue converter in continuous time sigma delta modulators | 2 | 2003 | |
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| 6,967,606 Loop filter for a continuous time sigma delta analog to digital converter | 14 | 2004 | |
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| 7,486,217 A/D converter | 2 | 2007 | |
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| 7,283,075 Delta-sigma modulator with selectable noise transfer function | 2 | 2004 | |
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| 7,227,570 Solid-state image pickup device and signal processing method therefor | 5 | 2003 | |
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| 7,474,241 Delta-sigma modulator provided with a charge sharing integrator | 1 | 2007 | |
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| 7,129,866 Method and apparatus for operating a delta sigma ADC circuit | 3 | 2005 | |
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| 7,414,557 Method and apparatus for feedback signal generation in sigma-delta analog-to-digital converters | 10 | 2006 | |
Patent Citation Ranking
Maintenance Fees
| Fee | Large entity fee | small entity fee | micro entity fee | due date |
|---|---|---|---|---|
| 3.5 Year Payment | $1600.00 | $800.00 | $400.00 | Nov 24, 2014 |
| 7.5 Year Payment | $3600.00 | $1800.00 | $900.00 | Nov 24, 2018 |
| 11.5 Year Payment | $7400.00 | $3700.00 | $1850.00 | Nov 24, 2022 |
| Fee | Large entity fee | small entity fee | micro entity fee |
|---|---|---|---|
| Surcharge - 3.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 7.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge - 11.5 year - Late payment within 6 months | $160.00 | $80.00 | $40.00 |
| Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
| Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |