Advance Product Datasheet
April 6, 2006
TGA4819-SL
Laboratory - Bias ON/OFF Procedure
Vd=8V, CPC=50%
Bias ON
1. Disable the output of the PPG
2. Set V
D
= 0V, V
CTRL
= 0V & V
G
= 0V
3. Set V
G
= -1.5V
4. Increase V
D
to 8V observing Id
- Assure I
D
= 0mA
5. Set V
CTRL
= +1V
- I
D
should still be 0mA
6. Make V
G
more positive until I
D
= 310mA.
V
G
will be approximately -0.3V.
7. Enable the output of the PPG.
Bias OFF
1. Disable the output of the PPG
2. Set V
CTRL
= 0V
3. Set V
D
= 0V
4. Set V
G
= 0V
8. Output Swing Adjust: Adjust V
CTRL
slightly positive to increase output swing or
adjust V
CTRL
slightly negative to decrease the output swing.
9. Crossover Adjust: Adjust V
G
slightly positive to push the crossover down or
adjust V
G
slightly negative to push the crossover up.
TriQuint Semiconductor Texas : (972)994 8465
Fax (972)994 8504 Web: www.triquint.com
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