 Phase detector:  Loop filter:  VCO: Phase Locked Loop (PLL) Design by Akin Akturk and Zeynep Dilli Figure 1: Basic PLL building blocks

Figure 2: Phase Frequency Detector and the Loop Filter Figure 3: PD and Loop Filter responses to input transients Phase Detector Design

Figure 4: The schematics of the VCO Figure 5: Schematics of the Current Pumps Voltage Controlled Oscillator

Figure 6: I-Vin for Current Pumps Figure 7: Vin-fosc Relation Design Considerations for the VCO

Figure 8: The Schematics of the 10-Bit Input Counter Ripple Carry Counter

PLL Building Blocks and Design Considerations Revisited Figure 8: Overall PLL Schematics

Figure 10: Reference Clock and the Output of the Counter Pspice Simulation Result I

Figure 11: Loop Filter and VCO Inputs Pspice Simulation Result II

Figure 12: VCO Output at the Start and the End of the Simulation Pspice Simulation Result III