Amplifiers – Signal feedback – Combined with control of bias voltage of signal amplifier
Patent
1975-04-18
1976-05-11
Safourek, Benedict V.
Amplifiers
Signal feedback
Combined with control of bias voltage of signal amplifier
330 30D, 332 11D, H03K 1322
Patent
active
039567001
ABSTRACT:
An analog input signal to a delta modulation coder is differentiated prior to being combined in an integrator with the output of a precise first negative feedback circuit to produce an error signal. An amplified and integrated form of the error signal is combined in a resistive-capacitive crossover circuit with the output of a fast, but coarsely integrating, negative feedback circuit to overcome delay in the response of the first-mentioned, i.e., slow, feedback circuit. The crossover circuit output is applied to a low gain comparator having a ground reference and used to drive a first clocked threshold circuit for producing a digital signal representation. A Q output of the latter circuit drives the fast feedback path; and a Q output controls a further clocked threshold circuit which drives the slow feedback path, as well as providing a retimed delta modulated output signal train. A delta modulation decoder which is compatible with the described coder is also shown.
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Electronics, Apr. 4, 1974, p. 120.
Bell System Technical Journal, M--J, 1969, pp. 1459-1479.
Bell Telephone Laboratories Incorporated
Phelan C. S.
Safourek Benedict V.
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