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Keywords: dual-band, triple-mode CDMA, CDMA, cellular phones, cellular band, TDMA, GSM, WCDMA, 100Mhz IF, IP, IP performance, low-noise amplifier, LNA, IIP3 Related Parts
REFERENCE SCHEMATIC 445
REP010: Dual-band IS-136 FE IC at 183MHz IF
May 01, 2002
Abstract: This reference design (RD) is for a dual-band CDMA front-end in an IS-136 TDMA receiver with all 183MHz IFs, The RD uses the MAX2338, a low-noise amplifier (LNA) with mixer that is useful for TDMA, GSM, EDGE, and WCDMA applications.
Rapid Engineering Prototypes are real circuits that Maxim application engineers have built and measured in our labs. They can provide a starting point for new RF designs. They are not available as evaluation kits.
Objective: To apply and measure this dual-band triple-mode CDMA front-end IC in an IS-136 TDMA receiver with all 183MHz IFs.
The MAX2338 was made to readily facilitate a single IF for both PCS- and cellular-band receive paths. Its mixer's IP2 performance and other related parameters offer sufficient margin for meeting 1/2 IF and other interferers in a CDMA handset. In this application, the MAX2338 was tested for and successfully applied to a TDMA handset front-end design. The common 183.6MHz IFs allow for minimizing the RF VCO and therefore the lowest parts' count and the simplest frequency plan.
The MAX2338 low-noise amplifier (LNA) plus mixer is designed for dual-band CDMA cellular-phone handsets, but it can also be used in dual-band TDMA, GSM, EDGE, or WCDMA applications. The MAX2338 furnishes a divide-by-2 function in the PCS-band LO input path, providing for a single VCO at the PCS band. The buffered LO outputs permit direct driving of the transmit-path upconverter without an external LO buffer. The MAX2338 differs from its predecessors (the MAX2320 and the MAX2323) in its lower noise figure and its higher IIP3 for both LNAs and mixers. Also, it comes in a small package (28-QFN).
