Gnss Antenna Interface; Reference Design For Passive Antenna - Quectel UC20 Hardware Design

5.2. GNSS Antenna Interface

The following tables show the GNSS antenna pin definition and frequency specification.
Table 25: Pin Definition of GNSS Antenna
Pin Name
ANT_GNSS
Table 26: GNSS Frequency
Type
GPS
GLONASS

5.2.1. Reference Design for Passive Antenna

Passive
antenna
100pF
D1
UC20_Hardware_Design
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Pin No. I/O
47 AI
Frequency
1575.42± 1.023
1597.5 ~ 1605.8
GND
GND
6.8nH
RFIN
NM
Figure 34: Reference Circuit of GNSS Passive Antenna
Description
GNSS antenna
56pF
RFOUT
/SHDN
51K
VCC
MAX2659
33pF
Confidential / Released
UMTS/HSPA Module Series
UC20 Hardware Design
Comment
50Ω impedance
Unit
MHz
MHz
NM
ANT_GNSS
MCU_GPIO
VDD
Module
220nF
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