Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1988-07-13
1990-05-15
Miska, Vit W.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
375 28, H03M 302
Patent
active
049261789
ABSTRACT:
A delta modulator includes an integrator, a comparator for sensing the output of the integrator and a flip flop for synchronizing the comparator output to a clock signal and providing an error signal to the input of the integrator. The output of the delta modulator is a data stream having a time-averaged duty cycle that represents the input signal amplitude. The integrator includes an amplifier that is provided with positive feedback. Error caused by the finite open loop gain of the amplifier is cancelled by the positive feedback. As a result, high accuracy is achieved. The integrator amplifier is stabilized by the overall negative feedback of the delta modulator loop.
REFERENCES:
patent: 3899754 (1975-08-01), Brolin
patent: 3956700 (1976-05-01), Condon
patent: 4612654 (1986-09-01), DeFreitas
J. E. Flood et al., Proc. IEEE, vol. 118, No. 9, Sep. 1971, pp. 1155-1161, see p. 1156, ch. 2, Fig. 1a.
F. Aghion et al., Alta Frequenza, vol. XLVII, No. 11, Nov. 1978, pp. 485E-815-488E-818.
Ed. by D. Shiengold, Analog-Digital Conversion Handbook, 1986, pp. 481-489.
"Digital Meets Analog", pp. 418-425, date unknown.
Analog Devices Inc.
Hoff Marc S.
Miska Vit W.
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