Self-adaptive fractional frequency synthesizer burr removing system and method
A frequency synthesizer, self-adaptive technology, applied to the automatic control of power, electrical components, etc., can solve the problems of lack of eradication of integer glitches and fractional glitches in fractional frequency synthesizers, and the inability to remove glitches from the source
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Embodiment 1
[0083] like figure 2 The fractional frequency synthesizer shown mainly generates loop current pulses through four modules including PFD 1, LD 2, FFVPG 3 and VACP 4. FFVPG 3 generates digital pulses with fixed position, fixed width and variable period, and VACP 4 generates charging current and discharging current with variable amplitude. FFVPG 3 drives VACP 4 to generate figure 2 The loop current pulse shown, where the fixed position is f REF The falling edge of the fixed width is T D , the pulse period is T during the transient REF , the pulse period is N×T when locked REF , and the sum of the amplitudes of the loop current pulses is zero when locked.
[0084] PFD 1 detection f REF and f DIV The phase error θ error , represented by pulse UP and DN. when f REF advance f DIV , UP outputs active level; when f REF Lag f DIV When , DN outputs active level.
[0085] LD 2 detection f REF and f DIV The phase error θ error , when θ error Greater than the threshold p...
Embodiment 2
[0092] figure 2 The loop current pulse I of the fractional frequency synthesizer shown CP The waveform of (t) is as Figure 9 , the period of the loop current pulse during the transient is T REF , the period of the loop current pulse during locking is N×T REF .
[0093] Taking the transient current pulse waveform as an example, its characteristics are as follows: the pulse width is fixed at T D , the pulse interval is fixed at T S , the pulse period is T REF , the number of pulses to complete a fractional frequency division is p, and the corresponding period is T REF0 , then T REF0 =p×T REF . a 1 , a 2 , ... and a p is the amplitude of the pulse, and its magnitude is the same as f REF and f DIV proportional to the phase error.
[0094] Will T D and T S The pulse amplitude in time is represented by ω and z discrete values respectively, then the pulse period T REF The number of sample points r inside is: r=ω+z, a fractional frequency division cycle T REF0 T...
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