An improved phase detector for use in a phase-locked loop.

A non-linear phase detector includes a retiming stage (32) and a phase synchronization stage (34).

The PLL comprises a phase detector (402), a filter (404), a voltage control module (406) and an oscillator (408).

The second power supply device is connected with the output of a phase and frequency discriminator via an amplifier and a low pass filter.

The equipment includes a photographed object illumination intensity sensor (1 ) whose output is connected to an oscillating luminous wave phase detector (3).

Light reflected from the scale (10) passes back through the filter (26) and through the lens (16) to a phase discrimination circuit (41).

In one embodiment, the DLL includes a phase detector which includes a reference input and a feedback input to determine a phase difference.

The system includes a sampling and pretreatment device, an adaptive equalization filter, a phase discriminator, a loop filter and an oscillation device, which are connected orderly.

The phase discriminator (3), the saw-tooth generator (4), the double moving window comparison group (5) and the operation processing circuit (6) are connected in sequence.

A Complex Adaptive Phase Discriminator (PD), as presented in some concepts of the present disclosure, is an adaptive filter that accurately estimates the instantaneous frequency of a dynamic complex signal.

A phase discriminator (PD) and two frequency discriminators (FD1, FD2) are used for controlling said control loop.

A phase discriminator (340) compares output from each chain and feedsback a signal to one of the chains and to a comparator (230) and can equalize delay through each chain.

The invention relates to a clock and data regenerator that consists of a control loop.

The signal output ends of the measuring signal pre-process circuit (2) and the reference signal pre-process circuit (1) are connected with the signal input ends of the phase discriminator (3) respectively.