Application NoteNxp

Effective Small Cell Solutions for MIMO Radios

Application note detailing high-efficiency small cell MIMO radio solutions using NXP LDMOS power amplifiers, GaAs pHEMT drivers, and Maxim SC2200 adaptive predistortion.

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Overview

This application note describes the RF performance and design of NXP's RF power LDMOS IC family for 1 to 5 watt small cell applications. It focuses on compact Doherty power amplifier (DPA) configurations driven by NXP GaAs pHEMT linear amplifiers and linearized with the Maxim Integrated SC2200 adaptive predistortion device. The document provides test results for the A2I20D040N and A2I25D025N LDMOS RFICs alongside the MMG20241H driver, demonstrating over 40% DC-to-RF power conversion efficiency and improved ACPR performance under various LTE test signals across frequency ranges from 1800 MHz to 2800 MHz.

Use Cases

MIMO Small Cell Radios
Heterogeneous Networks
Picocell and Femtocell Base Stations
Distributed Antenna Systems (DAS)
Active Antenna Systems

Topics

NXP

Maxim Integrated

SC2200

A2I20D040N

A2I25D025N

MMG20241H

Doherty Power Amplifier

MIMO

Small Cell

LDMOS

GaAs pHEMT

Adaptive Predistortion

Referenced Parts

SC2200

Maxim Integrated

Maxim Integrated SC2200, a fourth generation adaptive predistortion device

A2I08H040N

NXP

Table 3. Recommended Small Cell Portfolio ... 5 W Up to 1000 MHz A2I08H040N

A2I20D020N

NXP

Table 3. Recommended Small Cell Portfolio ... 1–2 W 1400–2200 MHz A2I20D020N

A2I20D040N

NXP

two-stage NXP A2I20D040N final with 30 dB gain

A2I25D025N

NXP

two-stage NXP A2I25D025N final with 29 dB gain

A2I25H060N

NXP

Table 3. Recommended Small Cell Portfolio ... 5 W 2300–2900 MHz A2I25H060N

A2I35H060N

NXP

Table 3. Recommended Small Cell Portfolio ... 5 W 3400–3800 MHz A2I35H060N

MD8IC925N

NXP

Table 3. Recommended Small Cell Portfolio ... 1–2 W Up to 1000 MHz MD8IC925N

MMG20241H

NXP

single-stage MMG20241H driver with 17 dB gain

SC2200

Maxim

RFICs linearized with the Maxim SC2200 dual path

SC2200

Maxim

frequency range linearized with a Maxim SC2200 dual path

SC2200

Maxim

The Maxim SC2200 belongs to the fourth generation family

SC2200

Maxim

of RF PA linearizers (RFPAL). The Maxim SC2200 provides

SC2200

Maxim

The following before and after drive up curves show that the incorporation of the Maxim SC2200 predistortion device into the

SC2200

Maxim

Maxim SC2200 dual path predistortion device for LTE signals

integrated.com/SC2200.

Maxim

www.maximintegrated.com/SC2200.

A2I20D040N

NXP

NXP A2I20D040N final with 30 dB gain and a single-stage

A2I20D040N

NXP

Table 1. Linearized NXP A2I20D040N Final and

A2I25D025N

NXP

Table 2. NXP A2I25D025N Final and MMG20241H Driver

SC2200	Maxim Integrated	Maxim Integrated SC2200, a fourth generation adaptive predistortion device
A2I08H040N	NXP	Table 3. Recommended Small Cell Portfolio ... 5 W Up to 1000 MHz A2I08H040N
A2I20D020N	NXP	Table 3. Recommended Small Cell Portfolio ... 1–2 W 1400–2200 MHz A2I20D020N
A2I20D040N	NXP	two-stage NXP A2I20D040N final with 30 dB gain
A2I25D025N	NXP	two-stage NXP A2I25D025N final with 29 dB gain
A2I25H060N	NXP	Table 3. Recommended Small Cell Portfolio ... 5 W 2300–2900 MHz A2I25H060N
A2I35H060N	NXP	Table 3. Recommended Small Cell Portfolio ... 5 W 3400–3800 MHz A2I35H060N
MD8IC925N	NXP	Table 3. Recommended Small Cell Portfolio ... 1–2 W Up to 1000 MHz MD8IC925N
MMG20241H	NXP	single-stage MMG20241H driver with 17 dB gain
SC2200	Maxim	RFICs linearized with the Maxim SC2200 dual path
SC2200	Maxim	frequency range linearized with a Maxim SC2200 dual path
SC2200	Maxim	The Maxim SC2200 belongs to the fourth generation family
SC2200	Maxim	of RF PA linearizers (RFPAL). The Maxim SC2200 provides
SC2200	Maxim	The following before and after drive up curves show that the incorporation of the Maxim SC2200 predistortion device into the
SC2200	Maxim	Maxim SC2200 dual path predistortion device for LTE signals
integrated.com/SC2200.	Maxim	www.maximintegrated.com/SC2200.
A2I20D040N	NXP	NXP A2I20D040N final with 30 dB gain and a single-stage
A2I20D040N	NXP	Table 1. Linearized NXP A2I20D040N Final and
A2I25D025N	NXP	Table 2. NXP A2I25D025N Final and MMG20241H Driver