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Steven DeYoreo - Electronics Design, Testing & Construction Services

CMM - 1530 : 5 WATT CELL PHONE POWER AMP

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The CMM - 1530 is a 5 WATT power amp designed for the 1.85 - 1.9 GHz celluar phone band. Through a slight re-tuning of the output of the test circiut board, I was able to test this device at 2.25 GHz.

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CLICK HERE TO VIEW THE SPECS IN A PDF FORMAT

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Below is the fixture we used to test the device. The device is placed on the circuit board and clamped down. The clamp ensures good RF and thermal contact. There is a heat sink mounted under the circuit board. Thermal vias pull heat from the device, through the circuit board, to the heat sink.

cmm1530fixture.jpg

Here's a close up of the business end. The device sits between the small cap-head screws.
Note the stripline structure of the circuit board. We operated this device at 2.25GHz while delivering the full 5 Watts of power with a CDMA modulated signal.

cmm1530closeup.jpg

After the devices were burned-in for 1 week while biased on, with no RF applied, they were retested.

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The spectrum analyzer we used is a Rohdes & Schwarz FSEA30. Click on the picture to go to Rodhes & Schwarz's web site.

fsea30.jpg

The signal generator we used is an AGILENT E4432B with CDMA profiles programmed in. The CDMA profiles are codes that allow you to digitally modulate the carrier with a psuedo-cellphone signal.

e4432b.jpg