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DP83241BV Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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DP83241BV Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 20 page Loop Filter Calculations Several constants need to be known in order to determine the loop filter components They are the loop divide ratio N the phase detector gain Kp the VCO gain Ko the loop bandwidth Wo and the phase margin w The constants Kp and Ko for the DP83241 are fixed at 80 mArad and 08 GradV respectively N is equal to the VCO frequency divid- ed by the reference frequency wo is recommended to be less than 120th of the reference frequency (times 2q rads) Having found all these constants the following equa- tions are used to find the component values For w e 57 phase margin R1 e (11 N wo)(Kp Ko) C1 e (3 Kp Ko)(N wo2) C2 e (03 Kp Ko((N wo2) For a phase margin other than 57 R1 e (Cosec w a 1) ((N wo 2 Kp Ko)) C1 e (Tan w) ((2 Kp Ko)(N wo2)) C2 e (Sec w b Tan w) ((Kp Ko (N wo2)) The component equations above are not meant to provide optimal solutions for all implementations Let us now design an example system with the following characteristics 125 MHz Crystal reference 250 MHz VCO Since the VCO is twenty times the frequency of the refer- ence frequency we get N e 20 We will set wo to be 130th of the reference frequency or 262 x 106 Rad From these values we get C1 e 1400 pF C2 e 140 pF and R1 e 900X Let us now design an example system with the following characteristics 125 MHz Crystal reference 250 MHz External VCO with a gain of 40 MRadV We will set wo to be 178th of the reference frequency or 1 0x106 Rad From these values we get C1 e 470 pF C2 e 47 pF and R1 e 68 kX TLF10385 – 27 10 |
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