Analogue-to-digital converters, digital-to-analogue converters,

Details Analogue-to-digital converters, digital-to-analogue converters, Analogue-to-digital converters, digital-to-analogue converters,

1992-04-30

1994-08-23

Hoff, Marc S.

Coded data generation or conversion

Converter calibration or testing

341143, H03M 110

Patent

active

053411358

ABSTRACT:
An analog-to-digital converter includes a filter having an input for receiving, via a summing node, a signal derived from the analog input signal. A first quantizer produces a first digital signal from a signal derived from the output of the filter. A feedback loop feeds a signal derived from the first digital signal to be combined in analog form with the signal derived from the analog input signal at the summing node, so that the filter in use receives an error signal representing the difference between the signal derived from the analog input signal and the analog representation of the first digital signal. An error signal filter filters the error signal to remove noise outside the passband of the analog-to-digital converter. A second quantizer produces a second digital signal representative of the filtered error signal, and a combining circuitry combines the first and second digital signals to produce a digital output signal representative of the analog input signal.

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Electronics Letter, Feb. 14, 1991, vol. 27, No. 4, pp. 307-308, "IIR Filtering on Sigma-Delta Modulated Signals", D. A. Johns et al.
Proc. IEE, Nov. 11, 1973, vol. 120, No. 11, pp. 1379-1383, "Digital-Computer-Simulation Results of Multistage Delta-Modulation Systems", Dr. P. K. Chatterjee et al.
IEEE Transactions On Acoustics, Speech, And Signal Processing, Dec. 12, 1988, vol. 36, No. 12, pp. 1899-1905, "Oversampling A-to-D and D-to-A . . . Noise Shaping Modulators", Kuniharu Uchimura et al.
"A Use of Double Integration in Sigma Delta Modulation" Candy, IEEE Transactions on Communications, vol. COM-33 No. 1, Mar. 1st, 1985, pp. 249-258.

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