Philips NXP BGU7004 GPS LNA User Manual page 10

NXP Semiconductors
Fig 9. Setup for 1 dB compression with jammers
The gain was measured in the GPS frequency band between port 1 and 2, while
simultaneously a jammer power signal was swept on port 3. Please note that the drive
power of the jammer is 20 dB lower at the input of the DUT caused by the directional
coupler.
MHz jammers respectively.
The analyzer read out for 850 MHz jammer is +9.3 dBm(see Figure 10) taking into
account the 20 dB attenuation of the directional coupler means P
For 1850 MHz the read out is +14.42 dBm (see Figure 11) taking into account the 20 dB
attenuation of the directional coupler means P
UM10491
User manual
Fig 10 and Fig 11 show the gain compression curves with 850 MHz and 1850
Rev. 1.0 — 14 June 2011
UM10491
BGU7004 GPS LNA EVB
1 dB = –10.7 dBm.
i
1 dB = –5.58 dBm.
i
© NXP B.V. 2011. All rights reserved.
10 of 15