Low-noise amplifier series deliver superior noise figure and linearity
The MGA-63xP8 devices and ALM-11×36 modules expand the company’s market-leading LNA portfolio for BTS applications, which leverage the company’s proprietary 0.25 µm GaAs Enhancement-mode pHEMT process to deliver low noise figure and high linearity. As opposed to a broadband approach, Avago offers series of LNAs with each device optimized for superior end performance at specific frequency operation ranges. Both these latest LNA series exemplify this philosophy. Reflecting the portfolio’s emphasis on integration, the ALM-11×36 modules can replace large discrete and surface-mount component counts in conventional designs, shortening design cycle time and providing board space savings.
The high-linearity MGA-63xP8 LNA series integrates active bias circuitry and a power down function, simplifying design by eliminating the need for external discrete components to perform the same functions. The series offers high-gain performance consistent across 700-2600 MHz, with the MGA-636P8 device operating from 450-1500MHz, while the MGA-637P8 and MGA-638P8 operate from 1500-2500 MHz and 2500-4000 MHz, respectively. The series thus supports all major cellular bands for GSM, CDMA and UMTS, as well as the next-generation LTE bands.
The LNAs are housed in a common footprint miniature package measuring 2.0 by 2.0 by 0.75 mm. With a shared pin-out and layout of external matching network, the LNAs provide a common PCB layout for customers when used at different frequencies, therefore simplifying design. The performance and features of the series make them ideal to be used as second or third stage LNAs for cellular BTS radio cards, TMAs, combiners, repeaters and remote or digital radio heads.
The ALM-11×36 LNA modules are equipped with a fail-safe bypass function, which is especially critical for TMA applications to enable the LNA bidirectional bypass path during the absence of DC power supply. Their superior bypass isolation eliminates the possibility of oscillation issues, and the modules also feature low bypass insertion loss and high input and output return loss. All matching components are fully integrated within the modules and the 50 ohm RF input and output pins are already internally AC-coupled. This makes the modules easy to use, as the only external parts required are DC supply bypass capacitors.
The series delivers optimum performance across a wide range of bands, with the ALM-11036 module covering 776-870 MHz, the ALM-11136 module covering 870-915 MHz, the ALM-11236 module covering 1710-1850 MHz and the ALM-11336 module covering 1850-1980 MHz. All the modules share the same compact 7.0 by 10.0 by 1.5 mm package and pin out configuration and are thus ideal for common platform designs.
The wireless infrastructure industry must provide optimum coverage with the best signal quality in a crowded spectrum. Receiver sensitivity is the most critical requirement in a BTS receiver’s design, and LNA selection greatly affects the receiver’s performance. For front-end design architectures with a bypass path, low noise figure (NF) and bypass insertion loss (IL) are the key design goals. Another key design factor is linearity, which affects the receiver’s ability to distinguish between wanted and spurious signals that are closely spaced. Input third-order intercept, IIP3, is used to specify linearity. The MGA-63xP8 LNAs and ALM-11×36 LNA modules are equipped with superior performance as follows:
- MGA-636P8 – 0.44 dB NF and 23.7 dBm IIP3 (Typical at 700 MHz, 4.8V and 108 mA);
- MGA-637P8 – 0.52 dB NF and 22.5 dBm IIP3 (Typical at 1700 MHz, 4.8V and 75 mA);
- MGA-638P8 – 0.87 dB NF and 22.6 dBm IIP3 (Typical at 2500 MHz, 4.8V and 84 mA);
- ALM-11036 – 0.78 dB NF, 0.82 dB bypass IL and 21.3 dBm IIP3 (Typical at 849 MHz, 5V and 92 mA);
- ALM-11136 – 0.76 dB NF, 0.85 dB bypass IL and 22.0 dBm IIP3 (Typical at 915 MHz, 5V and 92 mA);
- ALM-11236 – 0.67 dB NF, 0.75 dB bypass IL and 17.3 dBm IIP3 (Typical at 1785 MHz, 5V and 99 mA);
- ALM-11336 – 0.72 dB NF, 0.78 dB bypass IL and 17.9 dBm IIP3 (Typical at 1980 MHz, 5V and 100 mA).
For further information: www.avagotech.com.
If you enjoyed this article, you will like the following ones: don't miss them by subscribing to :
