Wideband Low Noise Amplifier


Posted on Feb 6, 2014

This application note discusses the application of Avago Technologies` MGA-675T6 for 5-6 GHz application. The MGA-675T6 is integrated internally with shutdown and biasing circuitry. Besides reducing the complexity of the external circuitry, the shutdown circuitry allows the LNA to be easily shut down by an external voltage control. This feature ma


Wideband Low Noise Amplifier
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kes the MGA-675T6 suitable to be used in a mobile receiver where the amplifier can be switched off easily to reduce current consumption and to extend a battery life. By using Avago Technologies` proprietary 0. 5-micron GaAs E-pHEMT technology (Enhancement-mode pseudomorphic high electron mobility transistor), the MGA-675T6 can achieve excellent linearity, high gain and very low noise fi gure at low voltage and current. These are the key parameters to improve the sensitivity of the receiver. The low operating voltage and current is essential to modern portable devices such as notebook or mobile devices that are equipped with multiple wireless standards (WiMAX, WLAN, GPS, and Digital Television etc. ). Simultaneous applications of these functions always require high power consumption, especially digital TV which heavily involves image display. Thus, great power effi ciency to extend battery life becomes an important requirement for portable devices. While operating at 3 V and 10 mA, the MGA-675T6`s measured performance at 5. 5 GHz on the demonstration board is typically: 1. 75 dB NF, >17 dB gain, -3 dBm IIP3, and -9 dBm IP1dB. The device can be easily shut down through an external control voltage, and it will draw almost zero current ( ­A range). The MGA-675T6 is housed in an UTSLP (Ultra-thin Small Leadless Package) package with a very low profi le (0. 4 mm) and small footprint (2. 0 G— 1. 3 mm2) that requires only a small...




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