Method and apparatus for communication and signal synthesis

Details Method and apparatus for communication and signal synthesis Method and apparatus for communication and signal synthesis

H - Electricity

03

L

H03L 7/18 (2006.01) H03D 7/16 (2006.01) H03L 7/107 (2006.01) H03L 7/22 (2006.01) H03L 7/23 (2006.01) H04B 1/30 (2006.01)

Patent

CA 2158667

In a receiving and transmitting apparatus, a frequency of a direct digital synthesizer provided in a local oscillating circuit is controlled in order to reduce a frequency error, based on data of a frequency error detecting circuit. The direct digital synthesizer includes a digital operation circuit for inputting data designating the frequency and outputting an amplitude value of a periodic signal synchronous with a reference clock, and digital-analog converter for converting the amplitude value of the periodic signal to an analog signal.

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