A quick bit synchronous circuit
A bit synchronization and circuit technology, applied in electrical components, electromagnetic wave transmission systems, automatic power control, etc., can solve the problems of long synchronization time, low adaptation rate, complex circuits, etc., and achieve the effect of fast synchronization and bit synchronization
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[0020] Further description will be given below in conjunction with the accompanying drawings. According to FIG. 1 , the fast bit synchronization circuit of the present invention includes a nonlinear processing module, an injection voltage controlled oscillator, an active loop filter, a frequency discriminator and a D flip-flop.
[0021] Since there is no bit frequency f in the burst NRZ code b The line spectrum of , so the code stream must be nonlinearly preprocessed to extract f b Line spectrum, so as to realize the clock extraction of the injection phase-locked loop circuit. Therefore, the input digital signal is firstly divided into two channels, except that one channel is input to the D flip-flop as the original to-be-decided signal to wait for decision, and the other channel is used as the clock extraction signal. The clock extraction signal is first input to the nonlinear processing module, and the nonlinear processing is performed to extract the bit frequency f in the...
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