180TSMC_PFD_02 is a phase-frequency detector (PFD) forms a control signal for VCO tuning. PFD compares phases of a divided VCO signal and a divided reference oscillator signal and detects phase ...

A Very Low-Frequency (VLF) detector uses two coils ... the waveform it produced showed a shift in phase from the emission coil’s waveform. This is pretty much directly translated to the ID ...