Chirp Modulator

The chirp signal generator consists of a pattern generator and a PLL.

 

 

 

 

 

 

1. Pattern Generator

The pattern generator creates a ramp signal that controls frequency variations.

This signal serves as the base waveform to be fed into the chirp modulator.

 

 

 

 

 

2. PLL

It produces a continuous sinusoidal signal with a frequency proportional to the input voltage.

Specifically, it outputs a signal whose frequency tracks the real-time voltage levels provided by the pattern generator.

 

 

 

 

 

 

 

 

3. Parameters

In the PLL, voltage v1 is converted into the start frequency f_start, while v2 is mapped to the cutoff frequency f_cutoff.

The frequency increases linearly during the positive slope between v1 and v2, and decreases linearly during the negative slope.