Introduction
Chapter 1
OEM6 Family Installation and Operation User Manual Rev 7
19
Figure 6: OEM638 Receiver System
1.3.1
OEM6 Family Card
NovAtel’s OEM6 family cards consist of a Radio Frequency (RF) section and a digital section.
Radio Frequency (RF) Section
The receiver obtains filtered, amplified GNSS signals from the antenna. The RF section down converts
the incoming RF signals to Intermediate Frequency (IF) signals which are processed by the digital
section. The RF section also supplies power to the active antenna LNA through the coaxial cable. The
RF section has been designed to reject common sources of interference.
Digital Section
The heart of the digital section is NovAtel’s MINOS6 ASIC (Application Specific Integrated Circuit). The
digital section digitizes and processes the IF signals to obtain a GNSS solution (position, velocity and
time). It also processes the system I/O, shown in
Figure 5, OEM615, OEM617D and OEM628 Receiver
and
Figure 6, OEM638 Receiver System on Page 19
1.3.2
Enclosure
An enclosure is necessary to protect the OEM6 family card from environmental extremes and high levels
of RF interference.
Antenna
LNA
RF
Section
MINOS6
ASIC
MINOS6
ASIC
OEM638 Board
Enclosure
Processor
FPGA
SD Card or
BT/Wi-Fi
Onboard
Storage
(4 GB)
I/O
Optional LNA
Power Supply
Optional External
Frequency Reference
(OEM638)
Power Supply
(3.3 V
or 4.5 V-36 V)
SDIO Interface
COM1
COM2
COM3
COM4
COM5
COM6/IMU
Transceiver
Transceiver
Transceiver
Event Output (x7)
Event Input (x4)
USB0 Device (High Speed)
USB1 Host Only
(High Speed)
USB2
CAN Communications 1
CAN Communications 2
User IO (x22)
General Purpose
Analog Input
10/100
Ethernet
SPI Interface (x2)
Magnetics
I
2
C (or IIC) Interface (x2)
