Patent ID: 6452522
Filing Date: 2002-09-17
Classification: H03M

Abstract:
An adaptive delta modulator comprising:an A/D-converter having a signal input adapted to receive an analog input signal, and having a control input supplied with a digital control signal, said AID converter converting said analog input signal into a digital output signal in a conversion procedure dependent on said control signal; a control unit which generates said digital control signal supplied to said control input of said A/D-converter, said control signal comprising a sign bit and a control word having a plurality of control bits; and a drift compensation logic circuit also supplied with said control signal which detects an initial drift in said A/D converter and which manipulates said control signal dependent on said initially detected drift to generate a drift compensated digital output signal by shifting said bits of said control word dependent on said initially detected drift, by shifting said sign bit and said control word in a direction to make said sign bit and said control word smaller if said initially detected drift is positive, and by shifting said sign bit and said control word in a direction to make said sign bit and control bit larger if said drift is negative.