Frequency synthesizer of using all-digit frequency detector and analogue phase detector
A frequency synthesizer and phase detector technology, applied in the direction of automatic power control, circuits that oscillate independently of each other, electrical components, etc., and can solve the problem of high jitter components of spurious frequencies
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[0022] Preferred embodiments of the present invention are described below with reference to the accompanying drawings.
[0023] refer to figure 1 , the frequency synthesizer 10 or clock synthesizer according to the present invention comprises a variable oscillator 11, wherein said oscillator is preferably a voltage controlled oscillator (VCO), which has a first control input 11a and a second control input Input 11b. VCO 11 produces an oscillator output signal whose frequency depends on its first and second control inputs 11a and 11b.
[0024] The frequency synthesizer 10 also includes an analog phase detector 13 and a digital frequency difference detector (FDD) 15 . Preferably, the analog phase detector 13, also sometimes referred to as a phase frequency detector PFD, includes a charge pump not separately shown. The analog phase detector 13 has first and second phase detection inputs 13a and 13b and is operable to generate a first control signal representative of the The p...
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