Delta-sigma based two-point angle modulation scheme

Details Delta-sigma based two-point angle modulation scheme Delta-sigma based two-point angle modulation scheme

H - Electricity

04

L

H04L 27/12 (2006.01) H03C 3/09 (2006.01) H03L 7/197 (2006.01) H04L 27/152 (2006.01)

Patent

CA 2281522

A novel angle modulation scheme and a PLL frequency synthesizer using it to generate digital modulation of a carrier signal are provided. A digital frequency divider in the feedback path of the loop has its division ratio controlled by a digital delta-sigma modulator. The modulation of the carrier is achieved by applying a modulation signal to the input of the delta-sigma modulator and to the input of the voltage-controlled oscillator of the PLL. The synthesizer of the invention is particularly useful in wireless communications systems.

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