BFS520 datasheet(60/130 Pages) NXP

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NXP Semiconductors RF Manual 16th edition

2.4Portabledevices

2.4.1

ThebestreceptionofGNSSsignalswiththesmallestfootprint

NXP SiGe:C GPS LNAs BGU700x/BGU8007

NXP's GPS low-noise amplifiers offer the best reception of weak signals because of dynamic suppression

of strong cellular and WLAN transmit signals. Moreover, as only two external components are required,

designers can save up to 50% in PCB size and 10% in component cost.

These SiGe:C low-noise amplifiers (LNAs) improve the

reception of GPS signals, including GloNass and Galileo.

Available in extremely small 6-pin packages, they reduce

footprint, lower cost, and enhance reception in systems that

use an active or patch antenna.

GPS has become a standard feature in a very wide range of

consumer products, from personal navigation devices to digital

video cameras, watches, electric cars, and more. GPS signal

power levels are weak and below the noise floor at -155 dBm.

In many of these products, especially smart phones, strong

transmitters such as WLAN and cellular can drive the GPS LNA

into compression. When the GPS LNA is in compression, it has

lower gain, and that can worsen GPS reception. Also, when the

LNA is in compression, it generates intermodulation products

and harmonics from the transmitter signals, which can

overpower the weak GPS signals and lead to no GPS reception.

The NXP BGU700x/BGU8007 series use adaptive biasing

to immediately detect any output power from jammers, and

compensate by temporarily increasing the current. As a result,

optimal GPS signal reception is maintained for as long as possible.

Each device in the BGU700x/BGU8007 series requires only one

input matching inductor and one supply decoupling capacitor

to complete the design. This creates a very compact design

and lowers the bill of materials. Designers can save up to 50%

in PCB size and 10% in component cost. For example,

the BGU7005 is in a 1.45 x 1 mm package with application

area at only 4.53 mm2. This is 50% smaller than a comparable

solution with a 9.06 mm2 application area.

Key features

 Low noise figure: 0.75 dB

 System-optimized gain of 16.5 or 19 dB

 Adaptive biasing dynamically suppresses strong cellular and

WLAN transmit signals, resulting in improved linearity of

10 dB better IP3 under -40 to -20 dBm jamming conditions

and effective GPS output with jammer powers up to -15 dBm

 AEC-Q100 qualified (BGU7004, BGU7008) for highest

reliability in harsh conditions

 Only two external components required

 Small 6-pin leadless package: 1.45 x 1.0 x 0.5 mm

Key benefits

 Maintains optimal GPS signal reception for as long as possible

 Significant PCB size savings (50%)

 Lower component cost (10%)

Applications

 Smart phones, feature phones

 Tablets

 Personal Navigation Devices (PNDs)

 Digital Still Camera (DSCs)

 Digital Video Camera (DVCs)

 RF front-end modules (used in phones)

 Complete GPS chipset modules (used in DSCs)

 Automotive applications (BGU7004/8): toll collection,

emergency call

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