OnBoard DAQ Concept

1
On-Board DAQ Concept
1) Pre determine Resolution 2) Generate sampling
pulses - to acquire data - to reset Vpp
circuit and phase detector circuit (if necessary)
2
Current set-up
Excitation Source
From Sample
18 18 5
output
Timer
Phase D.
ve Pk.D.
-
-ve Pk.D.
3
Alternate Option

• Use Hetrodyne mixers to extract phase and
  amplitude as done in Lock-in-Amplifier
• Advantages
• No need to deal with Noise problem with filtering
  etc.
• Exact alternative to lock-in-ampifier
• Blocks
• ?/2 shift module should not result affect
  reference signal amplitude