Improved pulse-width-modulation signal converter

Details Improved pulse-width-modulation signal converter Improved pulse-width-modulation signal converter

1985-06-26

1987-03-03

Sloyan, T. J.

Communications: electrical

Audible indication

Percussion-type sound producer

340347A, 340347CC, 340347M, 324 16R, 377 42, H03M 100

Patent

active

046479058

ABSTRACT:
An improved signal converter which isolates a measurement voltage by converting an analog signal into a pulse-width-modulated output signal. The converter has a first integrator followed in series by a threshold value controller whose output signal actuates at least one reversing switch element which supplies to the summing point of the first integrator at which the signal prevails, and to the threshold value controller, either a positive or negative reference voltage. This signal converter has a very low offset and a high linearity at high sampling rates. The signal also has a second integrator whose summing point is also connected to the signal input and output of the reversing switch element. The output signal of the second integrator is the reference signal of the first integrator. The linearity of the signal converter is thus exclusively dependent upon the parameters of the second integrator. Furthermore, a third integrator is connected in series to the output of the first integrator, with its output signal being superimposed on the reference voltage of the threshold value controller. The symmetry of the converted signal is thus dependent exclusively on the parameters of the third integrator. Even given high common mode interference, the second and third integrators can be built with slow-acting, precision amplifiers.

REFERENCES:
patent: 4031532 (1977-06-01), First
patent: 4161724 (1979-07-01), Smutny
The Engineering Staff of Burr-Brown Research Corp., Operational Amplifiers, 1971, pp. 213-218.

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