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For the fractional-N frequency synthesizer


Low-pass filter composed of three parts. Figure 9,ralph lauren paris, A, B are digital than the phase detector, -, vRz sizes of the phase difference determines the T-,abercrombie marseille,, T the thumb into the constant current charging circuit are conduction and conduction time, the phase waveform shown in Figure l0. As the current pulse in the harmonic components can be low-pass filter network,christian louboutin france, in which the average weight of the filter network to generate DC control voltage output in a cycle (), the charging current, the average weight of Jo:,. = Dl · 一 0 · L = port 1. 'Where J is the charge current pulse amplitude, 0 is the phase difference between V and, due to the VCO control voltage is higher,, rm, the lower, so V is phase difference between the 10, the phase characteristic curve shown in Figure 11, the phase gain: ... Ka-i (mA / rad) * 13 of this paper l-5.5 mA. Fourth, the circuit debugging and real results in two main difficulties in debugging circuits, one phase compensation; second circuit to reliably locked in fractional frequency. Mi phase complement integer frequency can only be carried out after the normal lock this part of the work, the constant fractional compensation For every source can only flow decimal one one of the debug from high to low for fractional frequency, first, c. traction to the integer frequency, and then locked in the required fractional frequency, for example: To obtain , o a Ⅳ. F · frequency output, the first traction to the 'eleven Ⅳ ·,,, and then locked in, one by one Lv.F · on. can be avoided (especially below 50kHz) frequency locking process is fractional saturation phenomenon, namely the VCO control voltage reaches the crystal is greater. for the fractional-N frequency synthesizer has been applied to broad-band function generator in the output sine wave indicator reached a high level, sine wave distortion: 5kHz ~ 10kHz < ; ~ 0.5, l0kHz20kHz <1,200 kHz ~ 2MHz <~ 2, fractional frequency stability to 1O a day. synthesizer to programmable, suitable for intelligent References 1DanD.Danl ​​~ ielsonandSIanleyE.Fr0m.ASymhsizedSignalSourcewithF unctionGenerator pabgJtits.H · PJaxrnalJanunary19792ChrL ~ Ewre ~ Axblti-aryandSynflxesizedWaveform######tendFuncllc4a a ~ neratorC.apabillti.EDN ... l · 29 · No · 22 a oct19843HP86B'2 Posts and Telecommunications Press, 9805 Tangze He .. etc. synthesizer programmable function generator with a wide amount of Electronic Technology Application .1990 * 95 Zhu Andong, etc. with blCS - 51 group Qi as a function of broad-band sound generator electrical and instrumentation ,] 990.11 (Liu New hair) electric power electric power electric power electric power electric power electric power electric power electric power electric power electric power electric power electric power electric power electric power electric power electric seven electric power electric power electric power electric power electric power (on the next 16) 6. memory value during the peak indicates a decline of 0.5% is not greater than the relative error: three, measuring the peak meter and check the AC ammeter in series, respectively, the standard sine wave input current i: 2A, 3A, 4A, 5A, 6A, read the DC milliampere meter indicates the current peak z × i000 one. _l '+ II + ... II + ... + II + ¨ l + II + I |. + j1. ... + ¨ · IIIl + ... + II + I ¨ +1. Ijl ¨ + + ll + I ¨ + llII + ILj + IlU + jll ... ● juII ¨ × 100, e should be small (Yasuhiro Yong and compiled) (on 33) instruments are Eh control can be achieved single-chip microcontroller and Technology Literature Press of such applications is just a try, and believe it will be compiled _ spine Junyi other type of computer chip logo Theory and Application of Shanghai Science and limonene further Die good push. pull technique Clubs (Jiang Wang Hong and compiled) setting a quota for the reference '1 Kingdom. Theory and Application Specific Integrated Circuits Shanghai Science
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