General Rules For Circuit Design; Power Supply - Sierra Wireless AirPrime XS1110 Product Technical Specification

5

5: General Rules for Circuit Design

This section provides rules to obtain the best performance when using the XS1110.

Power Supply

A low ripple voltage and stable power supply is required for the XS1110 to perform
optimally. An unstable power source will significantly impact GNSS RF reception
performance. To achieve high-quality performance, additional considerations to
stabilize power supply include:
1. Adding a ferrite bead, power choke, or low pass filter for power noise reduction.
2. Adding a linear regulator (LDO) rather than a switched DC/DC power supplier.
3. Using enough decoupling capacitors with VCC input for stable voltage.
Figure 5-1: Power Supply Design
Rev 4.0 Jul.20 37 41113354