Frequency synthesizer with an interface controller and...

Details Frequency synthesizer with an interface controller and... Frequency synthesizer with an interface controller and...

H - Electricity

03

L

H03L 7/00 (2006.01) H03J 5/02 (2006.01)

Patent

CA 2050901

A frequency synthesizer (fig. 1), which has at least one programmably characterized phase lock loop circuit (10,14) in- cludes a buffer memory (40,fig.4) and an interface controller (38,fig.2) responsive to operational codes received from a central controller (12) to direct transfer of data words (50,52) for characterization of the phase lock loop circuit among the at least one phase lock loop circuit, the buffer memory, and the central controller. In one embodiment, the transfer of data words between the central controller and phase lock loop circuit or buffer memory are performed serially in accordance with a prespecified protocol and governed by a clock signal generated by the central controller. Data word transfers between the buffer memory and at least one phase lock loop circuit may also be performed serially in accordance with a prespecified protocol, but may be governed auto- nomously by an internal clock signal generated by the frequency synthesizer.

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