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UMTS/HSPA Module Series

UC20 Hardware Design

UC20_Hardware_Design Confidential / Released 57 / 82

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

Pin No.

I/O

Description

Comment

ANT_GNSS

GNSS antenna

50Ω impedance

Table 26: GNSS Frequency

Type

Frequency

Unit

GPS

1575.42±1.023

MHz

GLONASS

1597.5 ~ 1605.8

MHz

5.2.1. Reference Design for Passive Antenna

Passive

antenna

MAX2659

Module

ANT_GNSS

/SHDN

GND

RFIN

GND

RFOUT

VCC

VDD

MCU_GPIO

100pF

6.8nH

220nF

33pF

51K

56pF

Figure 34: Reference Circuit of GNSS Passive Antenna

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