NXP Semiconductors MRF101AN Manuel utilisateur

Quick Reference

MRF101AN RF Essentials Kit

Accelerate Your RF Amplifier Design

with the Essential Components Kit

Quick Reference

GET TO KNOW THE MRF101AN KIT

RF Output

RF Input

Drain DC

Gate Bias

Gate Bias

47 kΩ

2.5 kΩ

Drain DC

D temp comp: 1N4148

(thermally coupled to Q1)

Figure 1: MRF101AN Board Connections Figure 2: External Temperature

Compensating Gate Bias Circuit

www.nxp.com

HOW TO GET STARTED

If the fixture is a new build:

1. Check gate bias connection using an ohmmeter: it should read open circuit.

2. Check drain DC power terminal using an ohmmeter: short gate bias to ground and

drain DC power terminal should read open circuit.

Initial power on:

1. Mount baseplate onto a heatsink capable of dissipating more than 40 W.

2. Terminate RF output with a 50 ohm load capable of dissipating more than 100 W.

3. Connect RF input to a 50 ohm source with RF off.

4. Set gate bias to 0 V.

5. Apply 40 to 50 Vdc to drain DC terminal. Current should be 0 A.

6. Adjust gate bias to desired target current, typically 1-10% of full rated current

(50-500 mA).

7. Slowly increment RF input power source taking care not to exceed 1 W. Monitor

drain DC current and RF output power (4 A max at 100 W).

8. Check drain DC current, RF output power and temperature (4 A max at 100 W).

Shutdown:

1. Shut off RF input power.

2. Reset gate bias to 0 V.

3. Remove drain DC voltage.

www.nxp.com/MRF101KIT

© 2019 NXP B.V.

All other product or service names are the property of their respective owners. All rights reserved.

Document Number: MRF101ANEKITQRC Rev. 0

Assembly notes:

• Mount all SMT devices on PCB (device values are dependent on frequency

of operation).

• Make sure no solder blobs are on non-component side of board.

• Trim leads of MRF101AN to shoulder.

• Mount board onto baseplate.

• Mount device using thermal grease, solder only after tightening device

mounting screw.

• Mount connectors and solder center pin.

• Connect bias network if used.

For design examples go to www.nxp.com/MRF101AN-TSP

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