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MC10E197FN Arkusz danych(PDF) 7 Page - ON Semiconductor |
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MC10E197FN Arkusz danych(HTML) 7 Page - ON Semiconductor |
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7 / 16 page  MC10E197 http://onsemi.com 7 Filter Circuitry Gain Constant(s) The open loop gain constant of the filter circuitry is given by: Kfc = K1 * Kl * Kd eqt. 2 The individual gain constants are defined in the appropriate subsections of this document. Loop Filter The two major functions of the loop filter are to remove any noise or high frequency components present in the phase detector output signal and, more importantly, to control the characteristics which determine the dynamic response of the phase lock loop; i.e. capture range, loop bandwidth, capture time, and transient response. Although a variety of loop filter configurations exist, this section will only describe a filter capable of performing the signal processing as described in the Data Read Mode and the Idle Mode sections. The loop filter consists of a differential summing amplifier cascaded with an augmenting integrator which drives the VCOIN input to the 10E197 through a resistor divider network (Figure 3). The transfer function and the element values for the loop filter are derived by dividing the filter into three cascaded subsections: filter input, augmenting integrator, and the voltage divider network (Figure 4). Loop Filter Transfer Function The open loop transfer function of the phase lock loop is the product of each individual filter subsection, as well as the phase detector and VCO. Thus, the open loop filter transfer function is: Fo(s) = Kφ * Fd(s) = Kd * * F1(s) * Fl(s) * Fd(s) Ko s F1(s) = K1 * 1 (s + p1) * 1 [s2 + (2ζω ) s + ω2 ] [s2 + (2ζω ) s + ω2 ] where: Fl(s) = Kl * 1 s * (s + z) 1 (s + p2) o2 o2 o1 o1 Figure 3. Loop Filter Circuitry PUMPUP PUMPDN VEEVCO VEEVCO VCCVCO VCCVCO VEEVCO VEEVCO R1 R1 RIA RA CA RV RO DB CO R3 R1 R1 CIN CIN VO MC34182 MC34182 VOLTAGE DIVIDER FO(s) AUGMENTING INTEGRATOR FI(s) FILTER INPUT F1(s) Fi(s) F(s)=F1(s)Fi(s)Fd(s) Figure 4. Loop Filter Block Diagram A root locus analysis is performed on the open loop transfer function to determine the final pole-zero locations and the open loop gain constant for the phase lock loop. Note that the open loop gain constant impacts the crossover frequency and that a lower frequency crossover point means a much more efficient filter. Once these positions and constants are determined the component values may be calculated. IPUMPUP IPUMPDN VEEVCO VEEVCO VEEVCO VEEVCO VCCVCO R1 R1 R1 R1 CIN V01 MC34182 Figure 5. Filter Input Subsection |
Podobny numer części - MC10E197FN |
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Podobny opis - MC10E197FN |
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