Phase/frequency synthesis using periodic sigma-delta modulated bit-stream techniques

摘要

A method and a circuit are provided for providing phase or frequency synthesis using sigma-delta modulation bit-stream techniques in which data is encoded utilizing sigma-delta modulation and then digital-to-time conversion (DTC) or digital-to-frequency conversion (DFC). In some embodiments this encoded data stream is further subjected to phase or frequency domain filtering, which in some embodiments is carried out by a higher-order phase-locked loop (PLL).

主权项

1. A circuit comprising:
an input port for receiving data for being encoded; a digital to frequency converter for encoding the data within a signal, the data encoded as signals of different frequencies within the signal to provide an encoded signal; and an output port for providing the encoded signal having the data encoded therein, wherein the plurality of different signals are at frequencies having a lowest common denominator frequency such that each period of the encoded signal is an integer multiple of periods divided by 2 of each of the different frequencies.