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Power amp loads 20mW for weak signal amplification

Posted: 29 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:New Japan Radio? NJM2278? power amplifier? weak signal amplification? amplifiers?

NJM2278 power amp from New Japan Radio

New Japan Radio Co. Ltd has announced the NJM2278, a 20mW power amplifier designed for use in the transmitters of specific extremely low-power radio equipment using weak signals in the 300/400MHz bandwidth.

The NJM2278 consists of a power transistor and a bias circuit. It amplifies weak signals of 300MHz to 500MHz and provides a maximum 20mW output signal to an antenna terminal via an external matching circuit.

Although ICs incorporating power amps for weak-signal wireless devices have been available on the market, their lack of power has been a problem, the company said. As a result, many engineers must design their transmission blocks with discrete components. However, as this becomes more common, attention must be paid to the external bias circuit to correct temperature characteristics. This can impose a serious burden on engineers. The company said its NJM2278 solves these problems with high gain, efficient temperature characteristics, low operating voltage, low current consumption and compact packaging.

Key features of the NJM2278 include:

  • Operating voltage: 2-5.5V

  • Low-current operation: 20mA (400MHz, 2.7V)

  • Power gain: 17dB (at Input -30dBm); 13dB (at Input 0dBm)

  • Saturation output power: 14dBm (at Input 3dBm)

  • Variable gain range: 4dB

  • Gain deviation: 1dB (-40C to 85C)

  • RF IN terminal impedance: 70 ohms

  • RF OUT terminal impedance: 110 ohms

  • Packaging: SOT-23-6 (MTP6) (2.8-by-2.9-by-1.3mm)

Engineering samples of the NJM2278 are available today. Production quantities will be available starting December 2006. Pricing starts at 69 cents.

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