TGA4953-SL View Datasheet(PDF) - TriQuint Semiconductor

Part Name

Description

MFG CO.

TGA4953-SL

9.9-12.5Gb/s Optical Modulator Driver

TriQuint Semiconductor 

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Product Datasheet

Jan 4, 2012

TGA4953-SL

Production - Initial Alignment - Bias Procedure

Vdd=5V, Vo=6Vamp, CPC=50%

(Hot Pluggable)

Bias Network Initial Conditions -

Vg1=-1.5V

Vg2=-1.5V

Vctrl1=-0.2V

Vctrl2=+.1V

Vdd=5V

Bias ON

1. Disable the output of MUX

2. Apply Vg1, Vg2, Vctrl1, Vctrl2, and Vdd in any sequence.

Bias OFF

Remove Vg1, Vg2, Vctrl1, Vctrl2, and

Vdd in any sequence.

Note: If Vdd is applied first Idd could reach near 400mA.

3. Make Vg1 more positive until Idd=65mA.

- This is Id1 (current into the first stage)

- Typical value for Vg1 is -0.65V

4. Make Vg2 more positive until Idd=180 - 220mA.

- This sets Id2T to 115 - 155 mA.

- Typical value for Vg2 is -0.55V

5. Enable the output of the MUX.

- Set Vin=500mV

6. Output Swing Adjust: Adjust Vctrl2 slightly positive to increase output swing or adjust

Vctrl2 slightly negative to decrease the output swing.

- Typical value for Vctrl2 is +0.22V for

Vo=6V.

7. Crossover Adjust: Adjust Vg2 slightly positive to push the crossover down or adjust

Vg2 slightly negative to push the crossover up.

- Typical value for Vg2 is -0.57V to center

crossover with Vo=6V.

TriQuint Semiconductor: www. triquint.com (972)994-8465 Fax (972)994-8504 info-networks@tqs.com 14

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