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DESIGN AND SIMULATION OF DIFFERENT TYPES OF PHASE FREQUENCY DETECTORS. Phase Frequency Detector (PFD) is one of the PLL blocks. The main concept of PFD is comparing two input frequencies in terms of both phase and frequency [1]. In a PLL the two frequencies are reference frequency (Fref) and the voltage controlled oscillator (VCO) output after division by N (Fvco). The output is a pulse proportional to the phase difference between the inputs and it drives the charge pump to either increase the control voltage of the VCO or decrease it or keep it without change. Basically three types phase frequency detectors are simulated over here, named as, simple phase frequency detector, DCVSL phase frequency detectors, current mode logic phase frequency detector. Specification Frequency 100MHz Nominated power Supply 3.3 V Power Dissipation 0.6mW, 1.6mw, 6.5mw Process Technology 0.35 um CMOS technology Design: Here we have designed three types of phase frequency detectors and analysed their different parameters at same input frequency and same input phase difference. In simple phase frequency detector, simple NAND gates are used using CMOS technology. In DCVSL PFD Differential cascode voltage switch (DCVS) logic is used which has potential advantages over conventional NAND/ NOR logic in terms of circuit delay, layout density and logic flexibility and in current mode logic, D latch is designed by using CML technology and it is being used in PFD using DFF. Results Different kinds of PFD have been designed with their corresponding results. [email protected] www.siliconmentor.com