Coded data generation or conversion – Analog to or from digital conversion – Nonlinear
Patent
1995-01-30
1997-11-04
Hoff, Marc S.
Coded data generation or conversion
Analog to or from digital conversion
Nonlinear
341155, H03M 118
Patent
active
056844808
ABSTRACT:
An analog-to-digital (A/D) converter circuit in which an extracted envelope of an input signal is used as a reference signal on an analog-to-digital converter, providing a wide dynamic range while avoiding the need for automatic gain control. Specifically, the A/D converter circuit includes a rectifier for rectifying an analog input signal, a filter for filtering a rectified analog signal output from the rectifier to provide a signal envelope used as the reference signal, and an analog-to-digital converter for converting the analog input signal into a digital signal within a range, the range being dynamically set in accordance with the reference signal provided by the filter. In alternative embodiments, an adder may be employed for adding the reference signal to the analog input signal as an offset and a multiplier for doubling the reference signal, the doubled reference signal being used for setting a range of the analog-to-digital converter, or a multiplier may be employed for generating a complement of the reference signal, wherein the reference signal and its complement are used for setting a range of the analog-to-digital converter. Still other alternatives include using a second analog-to-digital converter for converting the reference signal into a digital reference signal, using means for multiplying the digital reference signal with the digital signal output from the first analog-to-digital converter to scale the digital signal, and employing a digital-to-analog converter for converting the digital reference signal into a second analog reference signal, the second analog reference signal being used for setting a range of the first analog-to-digital converter.
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Hoff Marc S.
Telefonaktiebolaget LM Ericsson
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