Delta sigma analog-to-digital converter with increased dynamic r

Details Delta sigma analog-to-digital converter with increased dynamic r Delta sigma analog-to-digital converter with increased dynamic r

1992-03-02

1993-02-16

Logan, Sharon D.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341166, 341139, H03M 302, H03M 304, H03M 118

Patent

active

051874822

ABSTRACT:
A delta sigma analog-to-digital (A/D) converter includes a digitally-controlled multiplying digital-to-analog converter (MDAC) in a feedback configuration. The MDAC is driven by a digital signal obtained from the output (or an intermediate output) of the A/D converter. An incremental feedback quantum to the first stage integrator is a function of the input values that immediately precede it. In the most general implementation, a table look-up permits an arbitrary relation between the input values and feedback quantum size. In another implementation, the A/D converter output (or intermediate output) signal drive the MDAC and the compression curve of the A/D converter bears a square-root relationship to the input analog signal; a linear relationship is restored by squaring the output signal. In a third implementation, the MDAC is driven by a digital signal obtained from the output (or an intermediate output) of the A/D converter together with an added small positive constant number. In this implementation, the compression curve starts out approximately linear and approaches a square-root relationship at the high end of the scale, while a linear relationship is restored by providing the feedback loop, in the digital domain, with the same value of signal as employed in the analog domain.

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J. C. Candy et al., "Using Triangularly Weighted Interpolation to get 13-Bit PCM from a Sigma-Delta Modulator", IEEE Transactions on Communications, vol. COM-24, No. 11, Nov. 1976, pp. 1268-1275.
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