User's Manual
Table Of Contents
- Contents
- Table Index
- Figure Index
- 0. Revision history
- 1. Introduction
- 2. Product concept
- 3. Application interface
- 3.1. Pin of module
- 3.2. Operating modes
- 3.3. Power supply
- 3.4. Power on and down scenarios
- 3.5. Charge interface
- 3.6. Power saving
- 3.7. Summary of state transition
- 3.8. RTC backup
- 3.9. Serial interfaces
- 3.10. Audio interfaces
- 3.11. SIM card interface
- 3.12. SD card interface
- 3.13. PCM interface
- 3.14. ADC
- 3.15. Behaviors of the RI
- 3.16. Network status indication
- 3.17. Operating status indication
- 4. Antenna interface
- 5. Electrical, reliability and radio characteristics
- 6. Mechanical dimensions
- 7. Storage and manufacturing
- Appendix A: GPRS coding schemes
- Appendix B: GPRS multi-slot classes
M50 Hardware Design
M50_HD_V2.0 - 71 -
4. Antenna interface
The Pin 63 is the RF antenna pad. The RF interface has an impedance of 50Ω.
Table 30: Pin definition of the RF_ANT
4.1. RF reference design
The reference design for RF is shown as below.
Module
RF_ANT
0R
NM NM
Figure 49: Reference design for RF
M50 provides an RF antenna pad for customer’s antenna connection. The RF trace in host PCB
connected to the module RF antenna pad should be micro-strip line or other types of RF trace,
whose characteristic impedance should be close to 50Ω. M50 comes with grounding pads which
are next to the antenna pad in order to give a better grounding. Besides, a ∏ type match circuit is
suggested to be used to adjust the RF performance.
To minimize the loss on the RF trace and RF cable, take design into account carefully. It is
recommended that the insertion loss should meet the following requirements:
Name Pin Description
GND 61 Ground
GND 62 Ground
RF_ANT 63 RF antenna pad
GND 64 Ground
GND 65 Ground
GND 66 Ground
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