Driver, broadband power amplifiers tout high linearity

San Jose, Calif.—Aimed at WiMAX/WiBro applications, WJ Communications Inc. released four products, which include the AH314/AH315, high-linearity 2-W 2-stage driver amplifiers, and AP561/AP562, high performance 8-W single-stage power amplifiers.

The amplifiers are intended for use in WiMAX/WiBro applications at
the commonly targeted sub-bands within the 2.3 – 2.9 GHz and 3.3 – 3.8
GHz frequency ranges. All four amplifiers produced using InGaP/GaAs HBT process technology, and incorporate
proprietary bias circuitry to compensate for variations in linearity
and current draw over temperature. An internal active bias allows the
AH314/5 to operate at single +5V, while the AP561/2 internal active
bias allows them to operate at +12V with an added feature of a +5V
power down control pin.

The AH314 is a two-stage amplifier with 23 dB gain operating
between 2.3 and 2.9 GHz, while the AH315 has 25 dB gain operating
between 3.3 and 3.8 GHz. Both amplifiers offer +25 dBm linear output
power with less than 2.5% error vector magnitude (EVM), and with
greater than 2W of compressed 1 dB power. Key characteristics of both
amplifiers are very low EVM at highly power backoff conditions as well
as having very good gain flatness – less than 0.2 dB over a 100 MHz
window. The AH314/5 are ideal for WiMAX/WiBro Base Transceiver Station (BTS) applications requiring linearity margin prior to the final stage
amplifiers in the system.

The AP561 offers 12 dB gain and operates across 2.3 – 2.9 GHz
band, while the AP562 offers 12 dB gain across 3.3 – 3.8 GHz operating
range. These amplifiers deliver greater than 1W linear power at less
than 2.5% EVM with +39 dBm of 1 dB compressed output power. At 1W
linear power, the amplifiers will also have 13% power-added efficiency (PAE). The high output linear power and efficiency allows the AP561/2 to be used for outdoor customer premise equipment (CPE) applications.

Availability: The AH314/AH315 products are readily available, while the AP561/AP562 will be available for sampling in January 2008 with production in March 2008.
Datasheets: AH314, AH315, AP561 and AP562.

WJ Communications Inc., 1-408-577-6200,

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