A Sigma-Delta Frequency Discriminator Based Synthesizer. - Walt T. Bax; Tom A. D. Riley; Calvin Plett; Miles A. Copeland (ISCAS, 1995)

A GMSK modulator using a ΔΣ frequency discriminator-based synthesizer. - Walter T. Bax; Miles A. Copeland (IEEE J. Solid State Circuits, 2001)