To further improve performance of WiFi systems including access points, personal computers and PC cards, SiGe Semiconductor, Inc. has developed a new 2.4 GHz power amplifier (PA) using its proven architecture and advanced silicon germanium (SiGe) process. It incorporates a power detector for closed loop monitoring of the output power, while a digital enable provides on/off control. The temperature compensated power detector is highly immune to mismatch at its output with less than 1.5 dB of variation with a 2:1 mismatch.

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As a result, the new SE2587L PA delivers excellent linearity at transmit power levels of +19 dBm in 802.11g mode and +24 dBm in 802.11b mode. The high linearity optimizes transmission of greater data rates over longer distances, thereby allowing systems to support emerging wireless multimedia applications such as video distribution, video streaming and high-speed data, according to the manufacturer. Other features include 3% EVM at 19 dBm output power and 54 Mbps OFDM signal, 64 QAM, -32 dBc ACPR at Pout of 24 dBm and ±11 MHz offset from carrier, and a small signal gain of 32 dB.

Packaged in a 3 x 3 mm 16-pin QFN package, the device pin-out sequence is compatible with the company’s widely used SE2527L, SE2528L and SE2581L, minimizing the layout changes and allowing manufacturers to easily migrate to the new device for next-generation designs, stated SiGe Semiconductor. To further reduce system cost, the manufacturer offers application notes and support to replace discrete inductors used for output matching to patterned-on traces, taking advantage of the board space freed by the smaller footprint of the SE2587L. This could result in a savings of about 20% off the external bill of materials, the supplier said.

“With the SE2587L, we have worked closely with our customers to deliver the high performance they expect from SiGe in a form factor that is ideal for optimization of board layout and system cost,” said Jose Harrison, director, product marketing, computing and consumer. “The combination of our PA and applications support is unique in the industry. Our design expertise offers an innovative solution to efficiency and cost reduction.”

Leveraging an advanced SiGe technology, the device features a unique combination of linearity, accuracy and stability. The PA is characterized for both 3.3 V and 5 V operation for nominal and high power applications, respectively. SiGe integrates the reference voltage generator on-chip, allowing the PA to be enabled with a standard 1.8 V CMOS digital signal, and eliminating the large and current hungry external reference voltage generators.

The SE2587L is available now, and priced at $0.40 in volumes of 100K.

www.sige.com