4th-order sigma-delta modulator with leapfrog topology

Details 4th-order sigma-delta modulator with leapfrog topology 4th-order sigma-delta modulator with leapfrog topology

1995-10-20

1997-04-22

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Differential encoder and/or decoder

341155, 341144, H03M 300

Patent

active

056232632

ABSTRACT:
The invention relates to a high performance and absolute stable 4th-order sigma-delta modulator with leapfrog topology which contains the following key components: (a) four integrators for integrating the difference signal between the input and reconstruct signal; (b) three add/subtract adders for adding or subtracting analog signal; (c) three loop coefficient control members for controlling the performance and stability of the modulator, (d) an analog-to-digital converter (A/D converter) for quantizing the output signals of the fourth integrator to digital codes, and (e) a digital-to-analog converter (D/A converter) for converting the digital codes to analog signals.

REFERENCES:
patent: 4551683 (1985-11-01), Matsuo et al.
patent: 4600904 (1986-07-01), Shumaker
patent: 4884036 (1989-11-01), Koyama et al.
patent: 5298900 (1994-03-01), Mauthe et al.

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