User manual

Product Overview
© 2009 Microchip Technology Inc. DS51801A-page 7
• The Difference Amplifier (Diff. Amp.):
- Rejects the DUT’s common mode output (V
CM
)
- Provides additional gain (G
DA
≈ 10.0 V/V) to the term G
N
V
OS
at the DUT’s
output
- Shifts the output so it is centered on the reference V
REF
=V
DD
/2
- Produce an output voltage of G
DA
G
N
V
OS
+V
DD
/2
The inputs:
• Allow the DUT to be biased at most valid bias points
• Allow V
CM
to set by the circuit at V
DD
/2, or set by the user
The outputs:
• Make it easy to measure the important bias voltages V
DD
/2 and V
CM
• Make it easy to measure V
M
–V
DD
/2 = G
DA
G
N
V
OS