Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1988-09-16
1989-09-12
Shoop, Jr., William M.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
328165, 328167, 455334, 455309, 341126, 341155, 341172, H03M 184, H03M 100
Patent
active
048662615
ABSTRACT:
A data limiter in a paging receiver for converting an analog signal to a digital signal, the data limiter having a variable time constant. The data limiter includes an amplifying circuit and an integrating circuit. The amplifying circuit, being responsive to the analog input signal generated from a receiving circuit of the paging receiver, generates a reference signal depending upon a variable bias current input to the amplifying circuit. The integrating circuit, being responsive to the reference signal, generates a comparison signal depending upon a variable gain input. The amplifying circuit responsive to the comparison signal compares the comparison signal to the input signal for generating a digital output signal. A processing circuit of the paging receiver generates a first control signal for modifying the variable bias current input and a second output signal for modifying the variable gain input. Additionally, the processing circuit generates a third control signal being applied to the integrating circuit for effecting a storage of the comparison signal in the integrating circuit.
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Ingrassia Vincent B.
Kim Helen
Motorola Inc.
Sarli, Jr. Anthony J.
Shoop Jr. William M.
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