TGA4953-SL View Datasheet(PDF) - TriQuint Semiconductor
Part Name
Description
MFG CO.
'TGA4953-SL' PDF : 19 Pages View PDF
Product Datasheet
Jan 4, 2012
TGA4953-SL
Production - Post Alignment - Bias Procedure
Vdd=5V, Vo=6Vamp, CPC=50%
(Hot Pluggable)
Bias Network Initial Conditions -
Vg1= As found during initial alignment
Vg2=-As found during initial alignment
Vctrl1=-0.2V
Vctrl2=As found during initial alignment
Vdd=5V
Bias ON
1. Mux output can be either Enabled or Disabled
2. Apply Vg1, Vg2, Vctrl1, Vctrl2, and Vdd in any sequence.
Note: If Vdd is applied first Idd could reach near 400mA.
3. Enable the output of the MUX
4. Output Swing Adjust: Adjust Vctrl2 slightly positive to increase output swing or adjust
Vctrl slightly negative to decrease the output swing.
5. Crossover Adjust: Adjust Vg2 slightly positive to push the crossover down or adjust
Vg2 slightly negative to push the crossover up.
Bias OFF
Remove Vg1, Vg2, Vctrl1, Vctrl2, and
Vdd in any sequence.
General Comments for Production Operation of TGA4953-SL:
1.
Due to natural variations in gate voltages observed with GaAs FET amplifiers used internally to
the TGA4953-SL, optimal eye performance is obtained when the gate voltages (Vg1 and Vg2)
are set to control desired drain currents (Id1 and Id2T)
2.
Vc2 feedback circuit recommended for output amplitude correction.
TriQuint Semiconductor: www. triquint.com (972)994-8465 Fax (972)994-8504 info-networks@tqs.com 15
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