NXP Semiconductors

AN11035

50 Ohm FM LNA

AN11035

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© NXP B.V. 2011. All rights reserved.

Application note

Rev. 1.0 — 15 July 2011

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1. Introduction

„Music‟ as mobile value proposition has become increasingly popular in recent years.

Transferring MP3 from the PC and playing on the mobile is now common, eased by

decline in memory prices. This trend has re-ignited interest in FM Radio on Mobile as

people want to keep up with the news, listen to new music, in addition to playing their

MP3 collection.

With NXP„s FM LNA‟s consumers can listen to FM Radio on their mobile phone speaker.

They amplify the weak signal solving impedance mismatch between embedded antennas

and the FM Radio receiver.

2. Application Circuit

The FM LNA application circuit is built with BGU7003W (LNA MMIC). It needs 10 (11

components used in the EVB) external components for matching, biasing and

decoupling. The layout has also additional foot print for 0402 components, those are

reserved for different applications or ESD protection and matching purpose.

Fig 1. 50 Ohm FM LNA schematic