Converter circuit

Details Converter circuit Converter circuit

1987-02-26

1988-03-22

Miller, Charles D.

Communications: electrical

Audible indication

Percussion-type sound producer

340347DA, H03M 732

Patent

active

047332190

ABSTRACT:
A prior art digital Delta-Sigma converter is improved by including a second control loop with a second forward branch coupled between the first and second subtractor circuits and a third subtractor circuit coupled in series to the first integrator circuit and with a second feedback branch and a third subtractor circuit coupled to the output of said first integrator circuit. When the input signal is equal to zero the output signal of the first integrator circuit will rapidly change to zero because the second control loop applies an additional feedback signal to the third subtractor circuit and therefore also to the first integrator circuit. Because the output signal of the first integrator output circuit signal thus more rapidly varies to zero the same is true for the output signal of the second integrator circuit and therefore also for the converter output signal.

REFERENCES:
patent: 3793513 (1974-02-01), Kameko
patent: 4301446 (1981-11-01), Petit
"Design Methodology for .SIGMA..DELTA.M", Agrawal and Shenoi, IEEE Transactions on Communications, vol. COM-31, No. 3, Mar. 1983.
"A 3-.mu.m CMOS Digital CODEC with Programmable Echo Cancellation and Gain Setting," IEEE Journal of Solid-State Circuits, vol. SC-20, No. 3, Jun. 1985.

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