Frequency synthesizer

Details Frequency synthesizer Frequency synthesizer

H - Electricity

03

L

H03L 7/18 (2006.01) H03L 7/087 (2006.01) H03L 7/191 (2006.01)

Patent

CA 2108803

- 8 - SUMMARY Frequency synthesizer Based on a phase lock loop structure, composed by a reference signal generator (1), a first phase detector (2), a low pass filter (3), a VCO (4) and a frequency divider (5). In order to achieve a faster channel switching, maintaining the design of the filters as simple as possible, it is included a second phase detector (6) that receives the reference signal (9) and a second output signal (11) coming from the frequency divider (5) and shifted 90° with respect to its other output signal (10), and that generates a second phase error signal (13), in quadrature with the first phase error signal (12), that is filtered by a second low pass filter (7) generating a second filtered phase error signal (15). The two filtered phase error signals (14,15) are taken to a quadratic correlator (8) whose output supplies to the VCO (4) and its amplitude is proportional to the difference of frequencies between the reference signal (9) and any of the output signals (10,11) from the frequency divider (5).

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