Specifications

LEON-G100/G200 - System Integration Manual
GSM.G1-HW-09002-C Preliminary Design-In
Page 64 of 75
2.4.3 Antenna detection functionality
The internal antenna detect circuit is based on DC voltage measurement at ANT. The module may inject a
known DC current on ANT pin, to do resistance measurement.
To achieve good antenna detection functionality, use an RF antenna with built-in resistor from ANT signal to
GND, or implement an equivalent solution with a circuit between the antenna cable connection and the
radiating element as shown in Fig. 46.
LEON-G100
LEON-G200
ANT
A-to-D
Converter
Current
Source
RF
Choke
DC
Blocking
RF Transceriver
RF
Choke
DC
Blocking
Radiating
Element
Zo=50 Ohm
Resistor for
Diagnostic
Figure 46: Antenna Detection circuit
LEON-G100/G200 modules will report the measured value (ohmic resistance or voltage level) seen at ANT.
Values above the expected range indicate that the antenna has been disconnected. Values below the expected
range indicate that RF connection is shorted to GND.