AN464| Application Note
Maxim > App Notes > WIRELESS, RF, AND CABLE Keywords: REP012: Cellular LNA Achieves +20dBm IIP3 in Low-Gain High-Linearity Mode
Dec 07, 2000
APPLICATION NOTE 464
REP012: Cellular LNA Achieves +20dBm IIP3 in Low-Gain HighLinearity Mode
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.
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Wireless Product Line Page Quick View Data Sheet for the MAX2323/MAX2325 Applications Technical Support
Objective: For this dual-band triple-mode front-end IC, to experimentally tune for the best-possible cellular LNA linearity available in CDMA low-gain high-linearity mode. The project requirement was to custom-tune to obtain cellular LNA low-gain high-linearity performance of +20dBm IIP3, as well as to match the analog and the digital (cellular/PCS) mixer output ports both to 85.38MHz IFs. Note that this was a one-time experimental "limits-of-performance" design, which is difficult to achieve routinely. The LNA bias resistor was adjusted carefully along with the IF output matching circuit. The LNA input match was varied as well, but care was taken not to upset the mid-gain and high-gain noise figures. The LNA output match was not varied. It demonstrates the extremely versatile application designs that can be developed using these SiGe FE ICs. The MAX2323 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. It differs from its predecessor (the MAX2320) by adding a third "mid-gain" state for the cellular-band LNA that improves switchover hysteresis
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