Phase Frequency Detector D Flip Flop. Processing in a high speed trench oxide isolated process com bined with an innovative design gives the ad9901 a linear detection range free of indeterminate phase detection zones common to other digital designs. If the flip flop is edge triggered then it can likewise be used for digital signals of the form.
The ad9901 is a digital phase frequency discriminator capable of directly comparing phase frequency inputs up to 200 mhz. This type of phase frequency detector is widely used in many circuits because of its performance and ease of design and use. Of the set reset phase detector is half that of the ex or phase detector.
When e input at logic 1 then only the pfd output comes otherwise both outputs qa and q b are low.
However the set reset phase detector is a 2π phase detector twice that of the ex or. Both the exor and the jk flip flop have a severely limited pull in range if the loop filter does not have a pole at zero. Allen 2003 the phase frequency detector pfd the pfd can detect both the phase and frequency difference between v1 and v2. Its transfer function is.
