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-# Testing Caravel
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+## CMOS frequency synthesizer
+
+This project contains a 2.87 GHz fractional-N frequency synthesizer based microwave generator in skywater 130nm technology. This frequency synthersizer makes use of a phase locked loop to produce the output frequency. The PLL consists of a phase detector, charge pump, loop filter, varactor based 3 stage voltage controlled oscillator and multi-modulus divider.
+
+## Project implementation
+The figure below shows the block diagram for the 2.87 GHz fractional-N sythesizer implemented in skywater 130nm tecnology.  
+![PLL loop](PLL.png "Fractional -N synthesiszer PLL")
+
+
+### Simulation results
+To validate our circuit, we have tested it in 180 nm technology and the results for the same are shown in the figure below.
+#### Phase Frequency Detector
+![](pfd.png) 
+#### Voltage controlled Oscillator
+![](ro_cbank_var_post.png)
+
+### Sources
+This repository mainly contains all the required building blocks for the implementation of the PLL(gds/mag/netlists). We have the complete fractional-N PLL loop, individual blocks - PFD, fresctional-N divider, VCO, charge pump and loop filter. In addition to these we have combinations of phase dectector - divider and VCO - divider.  
+
+### DOCUMENTATION UNDER DEVELOPMENT
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