Automatic frequency calibrator using gradually increasing comparison count scheme and Wide-band frequency synthesizer comprising the same

摘要

There is provided an automatic frequency controller using the incremental comparison frequency increasing technique and a broadband frequency synthesizer including the same. The automatic frequency adjuster includes an automatic frequency adjuster for adjusting a frequency output from the voltage controlled oscillator using a binary search algorithm, the automatic frequency adjuster comprising: a frequency comparator for generating a reference frequency and an output frequency of the voltage controlled oscillator, A counter for counting frequencies; A comparison control unit for providing the frequency comparison count value to the counter unit; A comparator for generating an up / down control signal for determining up / down of a capacitor bank connected to the voltage controlled oscillator using the output value of the counter; And a binary search control unit for generating a capacitor bank control signal for controlling the capacitor bank using the up / down control signal, wherein the comparison control unit compares the frequency comparison count value .