Patent ID: 6690312
Filing Date: 2004-02-10
Classification: H03M

Abstract:
A method to regulate a signal level fed to an analog/digital converter, using a regulating circuit having a multiplexer and an accumulator, the accumulator having a counter, comprising:monitoring an output signal of the analog/digital converter and measuring a rate of change of the output signal; setting the signal level fed to the analog/digital converter based on a result of the monitoring and based on the rate of change where the signal level of the output signal remains within a certain range; measuring an average of the rate of change over time of a bit of the output signal; measuring a change of the bit with respect to a most-significant bit of the output signal; applying fixed values +1 and âˆ’1 to the multiplexer as input values, which are selectively switched through to the output of the multiplexer, based on the measured change of the bit; receiving, at the accumulator, the input values selectively switched through the multiplexer; changing the counter in a way corresponding to the input values; and generating the setting signal based on the counter reading.