Mean power frequency discriminator, frequency phase locked loop circuit and digital television demodulator using the same

摘要

Exemplary embodiments of the present invention provide a frequency phase locked loop circuit, which may enable a frequency and/or phase of a sampled signal to be tracked within a short time. Exemplary embodiments of the present invention also provide a digital television demodulator, which may use the frequency phase locked loop circuit. Exemplary embodiments of the frequency phase locked loop circuit may include a mean power frequency discriminator, a mean calculator, a phase discriminator, a loop-filter, and an adder. The frequency phase locked loop circuit may obtain a carrier frequency through a path and may track a phase of the carrier frequency through another path.