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RFFM4202

DS120427

7628 Thorndike Road, Greensboro, NC 27409-9421 · For sales or technical

support, contact RFMD at (+1) 336-678-5570 or customerservice@rfmd.com.

General Layout Guidelines and considerations:

For best performance the following layout guidelines and considerations must be followed regardless of final use or configura-

tion:

1. The ground pad of the RFFM4202 has special electrical and thermal grounding requirements. This pad is the main RF

ground and main thermal conduct path for heat dissipation. The GND pad and vias pattern and size used on the RFMD eval-

uation board should be replicated. The RFMD layout files in Gerber format can be provided upon request. Ground paths

(under device) should be made as short as possible.

2. The RF lines should be well separated with solid ground in between the traces to eliminate any possible RF leakages or

cross-talking.

RFFM4202 Tx production and system calibration recommendation:

It is highly recommended to follow the DC biasing step and RF power settings in the production calibration or test:

1. Connect the RF cables of input and output then connect to the proper equipment.

3. Set FEM in Tx mode by the truth table.

5. Set RF input to the desired frequency and initial RF input power at -20dBm. This will insure the Power amplifier is in a linear

state and not over driven.

6. Sweep RF from low to high output power and take measurements at the rated output power.

7. Insure that the output power at turn on doesn't saturate the power amplifier. The recommended output power should be

about 10dB to 20dB below the nominal input power. Start calibrating from low to high power in reasonable steps until the

rated power is reached then take the measurements. CAUTION: If the input signal exceeds the maximum rated input power

specifications, the RFFM4202 could be permanently damaged.