2.4 Portable devices
2.4.1
The best reception of GNSS signals with the smallest footprint
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.
Focus applications,
products & technologies
61
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
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 mm
2
. This is 50% smaller than a comparable
solution with a 9.06 mm
2
application area.
NXP Semiconductors RF Manual 16
th
edition
PHILIPS [ NXP SEMICONDUCTORS ]
