Digital TCXO using delta modulation

The authors propose a digital temperature compensated crystal oscillator (D-TCXO) which uses delta modulation for frequency compensation to reduce the frequency compensation information to one bit of data length (which is a minimum unit of digital information) per sampling temperature point. The method applies the delta modulation technique for encoding and decoding the frequency compensation information with respect to temperature changes. A prototype D-TCXO has been produced in order to prove the effectiveness of the method. The theory and experimental results agree with each other, and it has been confirmed that the proposed method is effective