Datasheet > BGU8004

BGU8004

更新时间： 2024-02-11 18:30:57

品牌	Logo	应用领域
恩智浦 - NXP		电信电信集成电路
页数	文件大小	规格书
18页	358K
描述
SPECIALTY TELECOM CIRCUIT, PBGA6, 0.65 X 0.44 MM, 0.29 MM HEIGHT, WLCSP-6

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BGU8004 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
零件包装代码：	CSP	包装说明：	0.65 X 0.44 MM, 0.29 MM HEIGHT, WLCSP-6
针数：	6	Reach Compliance Code：	compliant
风险等级：	5.83	Base Number Matches：	1

BGU8004 数据手册

AN11369

NXP Semiconductors

BGU8004 GNSS LNA EVB

8. Noise figure as function of jammer power at 850MHz

and 1850MHz

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 GNSS antenna. To measure this

behavior the setup shown in Fig 13 is used.

The jammer signal is coupled via a directional coupler to the DUT: this is to avoid the

jammer signal damaging the noise source. The GNSS BPF is needed to avoid driving the

second-stage LNA in saturation.

BGU8004

BGU7007

GPS LNA

GNSS LNA

GND V_enV_cc

EVB

Jammer signal

RF-generator

JU1

2^ndstage

LNA

SAW

RF in

RF out

-20dB

Noise

Source

Noise

analyzer

BGU8004

BGU7007

Directional coupler

Fig 13. Noise under jamming measurement setup (LNA evaluation board)

With the results of these measurements and the specification of the SAW filter, the

jammer power levels that cause noise increase can be calculated.

As can be seen in Fig 14, with a 850 MHz jammer the NF of the LNA starts to increase at

P_jam= -25 dBm (input jammer power at LNA-board, taking into account the approx 20 dB

attenuation of the directional coupler and RF-cable from Jammer-Generator to the

directional coupler). For the 1850 MHz jammer the NF of the LNA starts to increase at

P_jam= -30 dBm (see Fig 15).

AN11369

All information provided in this document is subject to legal disclaimers.

Application note

Rev. 1 — 10 October 2013

13 of 18

1...10 11 121314 15 16...18

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