</tr>
</table>
Run a Transient Test of your modulator circuit with the following [[parameters]]:
{| border="0"
|-
| valign="top"|
|-
{| class="wikitable"
|-
! scope="row"| Start Time
| 0
|-
! scope="row"| Stop Time
| 60u
|-
! scope="row"| Linearize Step
| 100p
|-
! scope="row"| Step Ceiling
| 100p
|-
! scope="row"| Preset Graph Plots
| v(1), v(13)
|}
The results are shown in the figure below. v(1) is the transmitted triangular ramp signal, and v(13) is the two-frequency output beat signal.
<table>
<tr>
<td>
[[File:SysTUT7 27.png|thumb|750px|The schematic graph of the input triangular ramp signal and the output beat signal of the FMCW radar transmitter-receiver circuit using triangular chirp modulation.]]
</td>
</tr>
</table>
In order to analyze the above results, zoom in the time axis and limit its scale to two intervals: [22μs, 23μs] during the up-ramp and [42μs, 43μs] during the down-ramp. The zoom-in graphs are shown below. Read the periods of the output beat signal at the middle of these time intervals.
<table>