frequency comparator การใช้

• Each signal was sent into a frequency comparator, with the output being the difference in frequencies.
• This code simulates the two D-type flip-flops that comprise a phase-frequency comparator.
• All of these are a function of the " loop filter " of the system, which is a low-pass filter placed between the output of the frequency comparator and the input of the VCO . Usually the output of a frequency comparator is in the form of short error pulses, but the input of the VCO must be a smooth noise-free DC voltage . ( Any noise on this signal naturally causes frequency modulation of the VCO . ) Heavy filtering will make the VCO slow to respond to changes, causing drift and slow response time, but light filtering will produce noise and other problems with harmonics.
• All of these are a function of the " loop filter " of the system, which is a low-pass filter placed between the output of the frequency comparator and the input of the VCO . Usually the output of a frequency comparator is in the form of short error pulses, but the input of the VCO must be a smooth noise-free DC voltage . ( Any noise on this signal naturally causes frequency modulation of the VCO . ) Heavy filtering will make the VCO slow to respond to changes, causing drift and slow response time, but light filtering will produce noise and other problems with harmonics.