
18
FN8198.0
March 11, 2005
Application Circuits (continued)
Attenuator
Filter
Inverting Amplifier
Equivalent L-R Circuit
+
–
VS
VO
R3
R1
VO = G VS
-1/2
≤ G ≤ +1/2
GO = 1 + R2/R1
fc = 1/(2
πRC)
+
–
VS
VO
R2
R1
ZIN = R2 + s R2 (R1 + R3) C1 = R2 + s Leq
(R1 + R3) >> R2
+
–
VS
Function Generator
R2
R4
All RS = 10k
+
–
VS
R2
R1
R
C
}
VO = G VS
G = - R2/R1
R2
C1
R1
R3
ZIN
+
–
R2
+
–
R1
}
RA
RB
frequency R1, R2, C
amplitude RA, RB
C
VO
X9430