AD588
Additional common-mode voltage reduction is realized by using
the circuit illustrated in Figure 28. A1, the ground sense ampli-
fier, serves the supplies on the bridge to maintain a virtual ground
at one center tap. The voltage that appears on the opposite
center tap is now single-ended (referenced to ground) and can
be amplified by a less expensive circuit.
+15V
220⍀
Q1 =
2N3904
RB
A1
R1
R2
R3
A2
R4
R5
R6
A3
A4
AD588
220⍀
Q2 =
2N3904
–15V
+VS
–VS
AD OP-07
+
VOUT
R1
–
R2
Figure 28. Floating Bipolar Bridge Drive with Minimum CMV
–14–
REV. D