Modulated feedback loop analog-to-digital converter

Details Modulated feedback loop analog-to-digital converter Modulated feedback loop analog-to-digital converter

1994-07-12

1996-10-15

Hoff, Marc S.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

341143, H03M 112

Patent

active

055658687

ABSTRACT:
The analog-to-digital converter receives an analog input signal (x(t)) to produce a digital error signal (y(t)).
It comprises a subtractor (1) to calculate the difference between the input signal and a reference signal (Ur(t)), a converter subsystem (2, 3, 4) to produce the error signal from said difference and a feedback loop to produce the reference signal by means of a digital-to-analog converter (5) which delivers a comparison signal (Uc(t)) in response to the error signal.
In accordance with the invention, the input signal (x(t)) is assigned a center frequency (f.sub.0), the feedback loop comprises a displacement unit (7) for displacing the frequency response of the digital-to-analog converter (5) from the null frequency towards the center frequency (f.sub.0), said displacement unit producing the reference signal (Ur(t)) from the comparison signal (Uc(t)).

REFERENCES:
patent: 4287595 (1981-09-01), Meyers
patent: 5039909 (1991-08-01), Welland et al.
patent: 5257026 (1993-10-01), Thompson et al.
patent: 5347279 (1994-09-01), Ishihara et al.
patent: 5351048 (1994-09-01), Yamasaki
H.-J. Dressler, "Interpolative Bandpass--A/D Conversion", Signal Processing, European Journal Devoted to the Methods and Applications of Signal Processing, vol. 22, No. 2, Feb. 1991.

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