GPS LNAs dynamically suppress strong jammer transmit signals
Requiring only two external components, the BGU700x LNAs save up to 50 percent in PCB size and 10 percent in component cost.
Duco Das, product marketing manager, NXP Semiconductors, comments, “With our latest LNAs, we offer a complete and robust IC solution with all the ingredients necessary to enhance GPS performance while protecting against jamming signals coming into a device. The LNA can dynamically adjust device reception according to the way signals come in, transmitting more on the relevant frequency as needed, and offering the best possible chance to stay connected to the GPS signal.”
In many products, especially smart phones, strong transmitters such as Bluetooth, WLAN and cellular can drive the GPS LNA into compression. When the GPS LNA is in compression, it has lower gain which causes poor GPS reception; it also generates intermodulation products and harmonics from the transmitter signals, capable of overpowering weak signals and leading to loss of 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.
For example, the BGU7005 is in a 1.45-mm x 1-mm package with an application area of only 4.53 mm2. This is 50-percent smaller than a comparable solution with a 9.06-mm2 application area.
For further information: www.nxp.com.
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