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The receiver module has the following five PCBAs (refer to
):
•
Power supply PCBA
•
CPU PCBA
•
Antenna PCBA
•
Digital PCBA
•
RF PCBA
Figure 3-11 Receiver module main PCBAs
Receiver Signal Flow
Power and SDLC connections are made through the 15-pin D sub
connector located on the back of the module. This connector goes
directly to the CPU PCBA. From here, power is routed to the power
supply PCBA where power is conditioned for the RF and digital
PCBAs. The power supply PCBA also provides all signal connections
between the CPU and digital PCBAs. Command data is exchanged
between the CPU and the digital PCBAs through a serial link. ECG,
SpO
2
, and NIBP data are delivered to the CPU PCBA with the
standard PWM signal used in digital telemetry.
The RF signal travels to the receiver module through the two BNC
connectors on the module’s front. These connectors are on the
antenna PCBA which then transfers incoming signals to the RF
PCBA. The RF PCBA has a synthesized local oscillator so all
CPU PCBA
digital PCBA
power supply
PCBA
receiver PCBA
antenna
PCBA
SDLC and power
+5 V
+5 V
+5 V
±
12 V
serial port
PWM ECG data
PWM ECG data
serial port
±
10 V
±
10 V
antenna inputs
synthesizer
RF input
RF input
and diversity switch
control
low level
PWM
(670-0724-XX)
(670-0617-XX)
(670-0723-XX)
(670-0933-XX) or
(670-0619-XX)
(670-1203-01)
(670-0973-05)
(670-1306-06)