Avago 公司的ALM-1712是 GPS 低噪音放大器前端模塊,它把低噪音放大器(LNA)和GPS FBAR濾波器組合在一起. ALM-1712采用先進的GaAs E-pHEMT和FBAR技術,具有非常低的噪音,典型值為1.65dB,關斷電六小于1uA,RF輸入引腳的ESD大于3KV,電源電壓可低到1.0V,并能通過單一外接電阻調整偏壓電流.本文介紹了ALM-1712的主要特性, 演示板和應用電路框圖, 演示板元件布局圖和所用元件表以及S參數(shù)和測量參考平面.

ALM-1712: GPS Low-Noise Amplifier Front-end Module with Integrated Pre and Post Filters and Variable Current/Shutdown Function

Avago Technologies’ ALM-1712 is a GPS front-end module that combines a low-noise amplifier (LNA) with GPS FBAR filters. The LNA uses Avago Technologies’ proprietary GaAs Enhancement-mode pHEMT process to achieve high gain with very low noise figure and high linearity. Noise figure distribution is very tightly controlled. A CMOS-compatible shutdown pin is included either for turning the LNA on/off, or for current adjustment. The integrated filter utilizes an Avago Technologies’ leading-edge FBAR filter for exceptional rejection at Cell/PCS-Band frequencies.

The low noise figure and high gain, coupled with low current consumption make it suitable for use in critical low-power GPS applications or during low-battery situations.

ALM-1712主要特性:
Very Low Noise Figure : 1.65 dB typ
Exceptional Cell/PCS-Band rejection
Advanced GaAs E-pHEMT & FBAR Technology
Low external component count
Shutdown current : < 1 uA
CMOS compatible shutdown pin (SD)
ESD : >3kV at RFin pin
1mm typical thickness
Adjustable bias current via single external resistor/voltage
Useable down to 1.0V supply voltage
Small package dimension: 4.5(L)x2.2(W)x1(H) mm3
Meets MSL3, Lead-free and halogen free
Specifications (Typical performance @ 25°C)
At 1.575GHz, Vdd = 2.7V, Idd = 8.0mA
Gain = 12.8 dB
NF = 1.65 dB
IIP3 = +7 dBm, IP1dB = +3 dBm
S11 = -9 dB, S22 =-10 dB
Cell-Band Rejection: 95dBc
PCS-Band Rejection: 90dBc

ALM-1712應用:
GPS Front-end Module



圖1.ALM-1712應用電路



圖2.ALM-1712演示板和應用電路框圖



圖3. ALM-1712演示板元件布局圖

表1.演示板和應用電路元件表





圖4.ALM-1712 S參數(shù)和測量參考平面

詳情請見:
http://www.avagotech.com/docs/AV02-1639EN