Main Board - LeCroy WaveSurfer 400 Series Service Manual

4.2

Main Board

The main board is divided into the following sections:
• Front End
• Analog to Digital Converter
• Trigger
• Time Base
• Calibrator
• SCAN DAC
• Main Board Control
uATX Board
CH1
ADC
System
CH1
FRONT
END
Zo=50ohms
4-2 Theory of Operation
Based on high impedance buffer, variable gain amplifier and differential
amplifiers.
Based on the HAM631 and the relay switchyard to combine the input channels.
Based on the Hybrids HTR420 discriminator & MST429A smart trigger.
Based on the MCG426 clock generator & MTB411A controller.
PCI Bus
MAM633
Control
CH2
ADC
System
Serial Bus
CH2
FRONT
END
Trigger signal
Figure 4-2 Acquisition Block Diagram
PCI Card
FPGA
CH3 CH4
ADC ADC
System System
CH3 CH4
FRONT FRONT
END END
AC Calibration
8bit Bus
TIME BASE
MAIN BOARD
CONTROL
TDC
SCAN DAC
MTB411A
Analog Control
Serial Bus
MCG426
Time Base Control
HTR420
MST429A
HTR420
HTR420
TRIGGER
HTR420
EXT
input
HTR420
DC Calibration
Calibrator