Keysight Technologies Infiniium MSOV 084A, Service Manual

Page: 151 / 164

Theory of Operation
7
Infiniium V-Series Oscilloscopes Service Guide 151
Backplane assembly
The backplane assembly is a device on the PCI Express (PCIe) bus connected by
two SATA cables that connect to a PCIe-to SATA adapter board that is connected
to the motherboard. The backplane assembly re12 V DC power through a
power interface board from the bulk supply, and all voltages are derived from
switching power regulators and other circuitry. Most of the switching and circuitry
are on the backplane board, with some distribution and generation done on the
acquisition boards. The following figure shows a block diagram of the functions
contained on the backplane assembly.
Backplane block diagram
The colors in the diagram represent different signal groups. The backplane
provides power ( red ), clock generation ( pink ), trigger ( green ), and calibrator
( yellow ) functions to the oscilloscope, as well as communications and control for
the PC software ( blue ). The PC connects to the measurement system through PCIe
to the main FPGA. Connections to all other circuits go through the main FPGA.
PCIe Conn
Power
Regulators
Main
FPGA
PROM
Pred 4
Trigger
FPGA
Clock
Gen
Interpolator
Acq Signal
Connector
Acq Signal
Connector
Acq Power
Connector
Acq Power
Connector
Calibrator
PCIe
PHY
PCIe Conn
Fan
Connector
Supply
Sequencing,
Sensing,
and
Shutdown
Motherboard
Connector
Front Panel
Connector
Motherboard
Connector
+12V Supply
Connector
External
10 MHz
In
10 MHz
Out
Cal Out
Probe Comp
To Motherboard To Bridge Board
Trigger Out
Trigger In
Trigger
IC
Phase
Locked
10 GHz
In From
PDRO
Reference
System
100 MHz
Out to
10 GHz
PDRO