REP014
CDMA PA provides -45dBc ACPR at +28.5dBm
Overview
Design Resources
Design & Integration File
- Schematic of 2265 Evaluation Kit (PDF)
- Bill of Materials Pt 1
- Bill of Materials Pt 2
- Performance Results of the MAX2265
Description
Objective: For this low-cost CDMA cellular PA, to develop an application circuit that offers good linearity with good power-added efficiency (PAE).
The project requirement was to tune the MAX2265 RF power amplifier in a cellular-band CDMA handset to meet 28.5dBm power output with -45dBc ACPR1 and 34% PAE. The EV board was used initially for the tuning and the tests.
The MAX2265 linear RF power amplifier is designed for U.S. cellular-band IS-95-based CDMA, PDC, and IS-136-based TDMA modulation formats. To improve its PAE, the MAX2265 offers a continuous-bias-current throttle-back arrangement. In this way, the amplifier linearity (that is, the adjacent-channel power ratio, or ACPR) is held relatively constant, whereas both the output power and the current drain are reduced. Thus, the desired linearity can be maintained, while improving low-output PAE, over a continuously variable output control range.
Parts Used
Documentation & Resources
-
REP014 Design Files3/3/2021ZIP97 K
Support & Training
Search our knowledge base for answers to your technical questions. Our dedicated team of Applications Engineers are also available to answer your technical questions.