chirp_gen :
An analog chirp generator

The chirp_gen primitive generates a chirp signal, which is a sinusoidal signal of which frequency varies with time. Depending on the parameter mode, the frequency can vary linearly (mode=’linear’) or exponentially (mode=’exp’) with time. The parameters freq_start and freq_stop define the start and stop frequencies, respectively, and the parameter period defines the time it takes for the frequency to change from freq_start to freq_stop.

The parameter delay defines when the chirp starts and parameter init_phase defines its initial phase then. The parameter amp and offset define the amplitude and offset of the output sinusoid, respectively.

Input/Output Terminals

Name	I/O	Type	Description
out	output	xreal	signal output

Parameters

Name	Type	Default	Unit	Description
offset	real	0.0	None	offset
amp	real	1.0	None	amplitude
freq_start	real	1.0e6	Hz	start frequency
freq_stop	real	10.0e9	Hz	stop frequency
period	real	1e-6	seconds	sweep period
mode	string	‘linear’	None	sweep mode
delay	real	0.0	seconds	initial delay
init_phase	real	0.0	radian	initial phase