A/D reference level adjustment circuit to maintain optimum dynam

Details A/D reference level adjustment circuit to maintain optimum dynam A/D reference level adjustment circuit to maintain optimum dynam

1995-07-31

1997-10-07

Young, Brian K.

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

H03M 112

Patent

active

056753390

ABSTRACT:
A method and circuit for controlling a reference voltage for an analog-to-digital converter having plural outputs includes a sensor for indicating when outputs from the A/D converter are at least a desired voltage, and a processor responsive to the sensor and connected to a digital-to-analog converter which provides a reference voltage for the A/D converter. The processor provides signals to the D/A converter which change the reference voltage. A logic unit in the processor increments an accumulator when either an I or a Q component in the A/D converter output is at least the desired voltage and decrements the accumulator when neither the I nor the Q component is at least the desired voltage. A counter may buffer the accumulator changes by using only several of the most significant bits of the counter to change the A/D converter reference voltage.

REFERENCES:
patent: 4482916 (1984-11-01), Acampora

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