Noise Figure As Function Of Jammer Power At 850 Mhz And 1850 Mhz - Philips NXP BGU7004 GPS LNA User Manual

NXP Semiconductors
Trc1 S21 dB Mag 1 dB / Ref 16 dB Cal int PCax
S21
20
19
18
17
M 1
16 16
15
14
13
12
Ch1 Arb Channel Base Start -25 dBm Freq 1.575 GHz
Fig 10. 1dB Gain compression 1.575 GHz 850 Mhz
jammer

7. Noise figure as function of jammer power at 850 MHz and 1850 MHz

Noise figure under jamming conditions is a measure of how the LNA behaves when e.g.
a GSM TX interfering signal is at the input of the GPS antenna. To measure this behavior
the setup shown in
The jammer signal is coupled via a directional coupler to the DUT: this is to avoid the
jammer signal damaging the noise source. The GPS BPF is needed to avoid driving the
second-stage LNA in saturation.
Fig 12. Noise under jamming measurement setup
In Fig 13
and 1850 MHz jammer signals.
UM10491
User manual
M 1 -25.00 dBm 16.289 dB
• M 2 9.30 dBm 15.286 dB
1
M 2
Stop 15 dBm
Fig 11. 1dB Gain compression 1.575 GHz 1850 Mhz
Fig 12 is used.
and Fig 14, the noise figure as a function of jammer power is given for 850 MHz
Rev. 1.0 — 14 June 2011
Trc1 S21 dB Mag 1 dB / Ref 16 dB Cal int PCax
S21
20
19
18
17
M 1
16 16
15
14
13
12
Ch1 Arb Channel Base Start -25 dBm Freq 1.575 GHz
jammer
UM10491
BGU7004 GPS LNA EVB
M 1 -25.00 dBm 16.288 dB
• M 2 14.42 dBm 15.289 dB
1
M 2
Stop 15 dBm
© NXP B.V. 2011. All rights reserved.
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