Phase Frequency Detector (PFD) is convert the input analog signals into digital output by comparing both input signals in terms of phase and frequency. PFD is widely used in Phase lock loop (PLL) as a phase detector. This paper describes a fully functional modular Feedforward phase/frequency detector and to show the characteristics and behaviour of some PFD designs in order to improve some important aspects as the delay time and the power consumption in the classical model. Circuits are design using 180nm TSMC CMOS technology.