Coded data generation or conversion – Analog to or from digital conversion – Increasing converter resolution
Reexamination Certificate
2007-05-22
2007-05-22
JeanPierre, Peguy (Department: 2819)
Coded data generation or conversion
Analog to or from digital conversion
Increasing converter resolution
C341S155000
Reexamination Certificate
active
11151934
ABSTRACT:
An analog-to-digital converter (ADC) system that converts an analog input signal into a digital output circuit uses a method of shaping a pseudo-random signal such that the ADC system can be used with input signals having wider swings. The ADC system also includes a quantizer having a comparator offset of less than =/−¼ least significant bit (LSB) in a stage calibrated for gain errors. A method of operating an ADC circuit includes measuring an amplitude and polarity of an input signal voltage and changing characteristics of a pseudo-random signal to ensure that a subsequent stage of the ADC circuit is not saturated. An implementation of the ADC circuit alters the pseudo-random signal based on the amplitude of the input signal such that when the input signal goes close to a positive rail, the pseudo-random signal alternates between a first range, and when the input signal goes close to a negative rail, the pseudo-random signal alternates between a second range.
REFERENCES:
patent: 4857927 (1989-08-01), Takabayashi
patent: 4996530 (1991-02-01), Hilton
patent: 5187481 (1993-02-01), Hiller
patent: 5905453 (1999-05-01), Kase
patent: 5940138 (1999-08-01), Lowe
patent: 6351229 (2002-02-01), Wang
patent: 6404364 (2002-06-01), Fetterman et al.
patent: 6462685 (2002-10-01), Korkala
patent: 6473019 (2002-10-01), Ruha et al.
Siragusa et al., “Gain Error Correction Technique for Pipelined Analogue-to-Digital Converters,” Electronics Letters, vol. 36, No. 7, Mar. 30, 2000.
Siragusa et al., “A Digitally Enhanced 1.8-V 15-bit 40-MSample/s CMOS Pipelined ADC,” IEEE Journal of Solid-State Circuits, vol. 39, No. 12, Dec. 2004.
Qin et al., “Sigma-Delta ADC with Reduced Sample Rate Multibit Quantizer,” IEEE Transactions on Circuits and Systems-II Analog and Digital Signal Processing, vol. 46, No. 6, Jun. 1999, 824-828.
Jean-Pierre Peguy
Nordic Semiconductor ASA
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