Frequency synthesizer having digital phase detector with...

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H03L 7/18 (2006.01) G01R 25/00 (2006.01) H03L 7/08 (2006.01) H03L 7/089 (2006.01) H03L 7/095 (2006.01) H03L 7/183 (2006.01)

Patent

CA 1299255

CE00260G Abstract For use in a radio synthesizer (110), a digital phase detector (118) indicates the phase error between a reference signal provided by a reference oscillator (117) and an output frequency signal (114) provided by a voltage controlled oscillator (112). The digital phase detector (118) includes four flip/flops (310, 312, 314 and 316) which receive the frequency signals (116 and 120) provided by the oscillators (117 and 112) to generate steering signals (126) which optimally indicate the phase error between the frequency signals (116 and 120) as well as providing optimal (maximum) frequency steering when a frequency difference between the frequency signals (116 and 120) exists. Responsive to the flip/flops, digital logic circuitry (306) is used to provide a non-integrated level-type indication when the frequency signals (116 and 120) are phase locked.

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