Phase/frequency detector that compares phase and frequency between two signals
Mixed-Signal Blockset / PLL / Building Blocks
The PFD block produces two output pulses that differ in duty cycle. The difference in the duty cycle is proportional to the phase difference between input signals. In frequency synthesizer circuits, such as phase-locked loops (PLL), the PFD block compares the phase and frequency between the reference signal and signal generated by the VCO block and determines the phase error.
[1] Banerjee, Dean. PLL Performance, Simulation and Design. Indianapolis, IN: Dog Ear Publishing, 2006.
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