Analog Devices Inc. ADPA1105-EVALZ

Overview

The ADPA1105-EVALZ from Analog Devices is an evaluation board designed to characterize and prototype the ADPA1105 GaN power amplifier IC - a 46 dBm (40 W), 0.9–1.6 GHz broadband RF power amplifier optimized for pulsed radar applications. It supports drain-pulsed operation via an integrated plugin pulser board, delivers 60% typical PAE at 0.9–1.4 GHz with 34.5 dB small-signal gain, and interfaces directly to 50 Ω systems without external matching.

For engineers reviewing the ADPA1105-EVALZ datasheet, ADPA1105-EVALZ setup guide, ADPA1105-EVALZ RF performance validation, or ADPA1105-EVALZ thermal management requirements, this board enables rapid functional verification, bias optimization, and pulsed RF output characterization of the ADPA1105 GaN MMIC under real-world radar duty-cycle conditions.

Technical Context

The ADPA1105-EVALZ implements a complete test platform for the ADPA1105 GaN MMIC, including on-board drain-pulse generation circuitry using MOSFET switching and local charge reservoir capacitors. It provides dedicated bias networks for VDD1/VDD2 (50 V), VGG1/VGG2 (−4 V to 0 V), and RF detection circuitry (VDET/VREF) with 715 Ω bias resistors and differential amplification support.

Thermal design follows Analog Devices' recommended layout for the 5 mm × 5 mm LFCSP_CAV package, featuring an exposed ground pad connected to a multi-layer PCB thermal plane. The board supports transient thermal measurements across pulse widths (20–500 μs) and duty cycles (2–20%), aligning with the ADPA1105's specified θJC of 2.11°C/W at 100 μs/10%.

Key Specifications

Availability

ADPA1105-EVALZ is available at Aetrix Electronics and suitable for radar prototyping, defense electronics development, pulsed RF system validation, and GaN amplifier characterization requiring stable component supply and full technical documentation support.

Supply support for ADPA1105-EVALZ 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

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and RF ICs, serving precision instrumentation, communications, and defense markets since 1965.

The ADPA1105-EVALZ belongs to Analog Devices' GaN RF power amplifier evaluation platform family, engineered specifically to accelerate development of high-efficiency, high-power pulsed radar transmitters operating in L-band.

FAQ

What is the primary function of the ADPA1105-EVALZ?

The ADPA1105-EVALZ is an evaluation board purpose-built to validate and prototype the ADPA1105 GaN power amplifier IC. It provides all necessary biasing, pulsing, RF interfacing, and power detection circuitry - including a plugin pulser board - enabling immediate functional testing of the ADPA1105 under realistic radar pulse conditions without custom PCB design.

Does the ADPA1105-EVALZ support continuous-wave (CW) operation of the ADPA1105?

No - the ADPA1105-EVALZ is configured exclusively for pulsed operation, consistent with the ADPA1105's absolute maximum ratings and thermal design constraints. The board implements drain-pulsed mode using its integrated plugin pulser board and does not provide thermal or electrical provisions for safe continuous-wave operation of the ADPA1105.

How is RF output power monitored on the ADPA1105-EVALZ?

The ADPA1105-EVALZ supports RF output monitoring via the ADPA1105's integrated directional coupler and detector diodes. VDET and VREF pins are brought out with 715 Ω pull-up resistors to 5 V; their voltage difference (VREF − VDET) yields a temperature-compensated DC signal proportional to RF output power, usable with an external differential amplifier.

What RF connectors are used on the ADPA1105-EVALZ?

The ADPA1105-EVALZ uses standard SMA female connectors for both RFIN and RFOUT ports. These match the 50 Ω impedance of the ADPA1105's internal RF ports, eliminating the need for external matching networks and enabling direct integration into standard lab RF test setups.

Can the ADPA1105-EVALZ be used to evaluate gate-pulsed operation of the ADPA1105?

Yes - while the included plugin pulser board is optimized for drain-pulsed mode, the ADPA1105-EVALZ provides full access to VGG1 and VGG2 control lines. Engineers may implement external gate pulsing by applying a pulsed negative voltage (−4 V to ~−2.3 V) to these pins, using the board's existing gate bias network and decoupling capacitors as specified in the ADPA1105 datasheet.