Title:
【発明の名称】相互デジタル合成によるデジタルAFCチューニング法
Document Type and Number:
Japanese Patent JP2001519109
Kind Code:
A
Abstract:
A circuit for automatic frequency control includes an oscillator and a digital synthesis device to which a first frequency of the oscillator is supplied as a clock frequency and which generates an output signal having a second frequency. A frequency comparison device determines a frequency difference between the second frequency and a reference frequency and generates a digital output signal reproducing the frequency difference. The digital output signal is then supplied as an addition value to the digital synthesis device. The circuit for automatic frequency control generates a highly accurate and temperature-compensated output signal with the second frequency.
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Inventors:
Ludwig Hoffmann
Application Number:
JP54221698A
Publication Date:
October 16, 2001
Filing Date:
February 13, 1998
Export Citation:
Assignee:
Siemens Aktiengesellschaft
International Classes:
H03B28/00; H03L1/02; H03L7/099; H03L7/18; (IPC1-7): H03L7/099; H03B28/00
Attorney, Agent or Firm:
Toshio Yano (3 outside)