NXP Semiconductors AFSC5G37E38-EVB

Overview

AFSC5G37E38-EVB from NXP Semiconductors is an evaluation board for the AFSC5G37E38 fully integrated Doherty power amplifier module, designed for 3600–3800 MHz wireless infrastructure applications. It supports LTE TDD/FDD operation at 29 Vdc supply, delivers 6.3 W average RF output power with 41.8% PAE and –27.3 dBc ACPR, and targets massive MIMO base stations and outdoor small cells.

For engineers reviewing the AFSC5G37E37E38-EVB datasheet, AFSC5G37E38-EVB pinout, AFSC5G37E38-EVB application, or AFSC5G37E38-EVB equivalent, this board enables rapid characterization of the AFSC5G37E38's linearity, efficiency, and ruggedness under real-world 20 MHz LTE signals with 8 dB PAR - critical for 5G NR band n78 deployment validation.

Technical Context

The AFSC5G37E38-EVB implements NXP's reference circuit per Figure 2 and Table 13, featuring Rogers RO4350B PCB (ε_r = 3.66), 30 Ω ferrite beads (BLM15PD300SN1), and precision gate bias resistors (2.2 kΩ) for thermal tracking. It provides full DC and RF access to all 27 pins of the AFSC5G37E38 module, including independent carrier/peaking stage drain and gate supplies.

It supports functional testing per Tables 8–9 and ruggedness validation per Table 10, with calibrated 50 Ω input/output interfaces, pulsed CW and modulated signal capability, and thermal management via exposed backside ground. The board is optimized for measurement repeatability across –40°C to +105°C operating temperature range.

Key Specifications

Availability

AFSC5G37E38-EVB is available at Aetrix Electronics and suitable for 5G massive MIMO base station development, outdoor small cell RF front-end validation, and low-power remote radio head prototyping requiring stable component supply and traceable reference design implementation.

Supply support for AFSC5G37E38-EVB includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

NXP Semiconductors is a global semiconductor leader specializing in secure connectivity solutions for automotive, industrial, and communications markets, with over 50 years of RF power expertise.

The Airfast product line delivers high-efficiency, thermally robust RF power amplifier modules for wireless infrastructure - engineered specifically for 5G macro and small cell base stations demanding high linearity and reliability in compact form factors.

FAQ

What is the primary function of the AFSC5G37E38-EVB?

The AFSC5G37E38-EVB is an evaluation board designed exclusively to characterize and validate the AFSC5G37E38 Doherty power amplifier module. It provides full RF and DC access to all 27 pins, implements NXP's reference circuit layout using Rogers RO4350B substrate, and enables accurate measurement of gain, PAE, ACPR, and ruggedness under 3600–3800 MHz LTE and 5G NR signals. The AFSC5G37E38-EVB does not contain active circuitry beyond passive matching and biasing components.

Does the AFSC5G37E38-EVB support both TDD and FDD LTE configurations?

Yes, the AFSC5G37E38-EVB supports both TDD and FDD LTE configurations as specified for the underlying AFSC5G37E38 module. Its reference circuit design and component selection - including 30 Ω ferrite beads and 2.2 kΩ gate feed resistors - maintain stability and linearity across modulation schemes. Measurements in Tables 8–11 confirm performance at 3600 MHz and 3800 MHz under 1-tone CW and 20 MHz LTE with 8 dB PAR, validating interoperability with both duplexing modes used in Band 42/43 deployments.

What PCB material and stack-up are used on the AFSC5G37E38-EVB?

The AFSC5G37E38-EVB uses Rogers RO4350B dielectric material with a thickness of 0.020″ and relative permittivity ε_r = 3.66, as documented in Section 11.2 of the AFSC5G37E38 datasheet. This high-frequency laminate ensures controlled 50 Ω impedance for RF traces, low insertion loss at 3.7 GHz, and thermal stability during high-power operation. The board implements a 4-layer stack-up optimized for ground plane integrity and minimal coupling between carrier and peaking stage bias lines.

Can the AFSC5G37E38-EVB be used for thermal testing of the AFSC5G37E38 module?

Yes, the AFSC5G37E38-EVB supports thermal testing of the AFSC5G37E38 module. Its design exposes the module's backside ground pad for direct thermal interface, and it operates within the AFSC5G37E38's specified case temperature range of up to 125°C. Performance data in Table 11 confirms gain variation of only 0.036 dB/°C and P3dB variation of 0.011 dB/°C from –40°C to +105°C - parameters verified using this evaluation platform. Thermal vias and copper pour are implemented per NXP's reference layout to replicate production thermal behavior.

Are the gate bias resistors on the AFSC5G37E38-EVB configurable for different quiescent current targets?

Yes, the AFSC5G37E38-EVB includes 2.2 kΩ chip resistors (R5–R8) at each gate supply node (VGC1, VGC2, VGP1, VGP2) to enable precise quiescent current control per AN1977 and AN1987. These values are selected to achieve IDQ1A = 18 mA and IDQ2A = 58 mA for the carrier stages and microamp-level bias for peaking stages, as required for optimal Doherty efficiency and linearity. Resistor footprints allow replacement with alternate values to adjust I_Q across temperature without redesigning the board.