Changes

Jump to: navigation, search

RF Tutorial Lesson 11: Designing a Microstrip MESFET Amplifier

159 bytes removed, 00:11, 28 September 2015
/* Running an AC Frequency Sweep to Compute Power Gain */
| i(iam1), i(iam2)
|}
 
Similarly, define a custom output plot called "Power_Gain" for your amplifier. Use the same definition: G<sub>P</sub> = 20*log10(abs(i(am2)/i(am1))).
 
 
 
Next, connect the AC voltage source and the source and load resistors and place the source and load ammeters in a similar manner as in the last part of this tutorial lesson. Similarly, define a custom output plot called G<sub>P</sub> for the power gain of your amplifier. Use the same definition: G<sub>P</sub> = 20*log10(abs(i(am2)/i(am1))). Run an AC Frequency Sweep Test of your amplifier from 3GHz to 5GHz with linear frequency steps of 10MHz. The figure below shows the graph of power gain vs. frequency.
<table>
<tr>
<td>
[[File:RF150RFTUT11_7.png|thumb|640px750px|The MESFET amplifier with microstrip matching networks at its graph of variation of input source current and outputload current as a function of frequency.]]
</td>
</tr>
</table>
Also define a custom output plot called "Power_Gain" for your amplifier using the same definition: G<sub>P</sub> = 20*log10(abs(i(am2)/i(am1))).
{| border="0"
|-
| valign="bottomtop"|[[File:RF153.png|thumb|900px|left|The graph of the power gain of the MESFET amplifier vs. frequency.]]
|-
{| class="wikitable"
|-
! scope="row"| Start Frequency
| 3G
|-
! scope="row"| Stop Frequency
| 5G
|-
! scope="row"| Steps/Interval
| 10Meg
|-
! scope="row"| Interval Type
| Linear
|-
! scope="row"| Preset Graph Plots
| Custom: Power_Gain
|}
 
The figure below shows the graph of power gain vs. frequency.
 
<table>
<tr>
<td>
[[File:RFTUT11_8.png|thumb|750px|The graph of the power gain of the MESFET amplifier vs. frequency.]]
</td>
</tr>
</table>
<p>&nbsp;</p>
[[Image:Back_icon.png|40px]] '''[[RF.Spice_A/D#RF.Spice_A.2FD_Tutorial | Back to RF.Spice A/D Tutorial Gateway]]'''
28,333
edits