Datasheet

LTC6412
20
6412fa
Figure 7. Large-Signal Output Equivalent Circuit Schematic Figure 8. Small-Signal Output Equivalent Circuit Model
200Ω
50Ω12.5Ω
50Ω
DUT
1:1
IDEAL
TRANSFORMER WITH CENTER TAP
1:1
IDEAL
TRANSFORMER WITH CENTER TAP
DIFFERENTIAL
MODE
PORT 2
DIFFERENTIAL
MODE
PORT 1
COMMON
MODE
PORT 2
COMMON
MODE
PORT 1
+OUT+IN
–OUT–IN
6412 F05
Figure 5. Schematic of Mixed-Mode S-Parameters Reported for Test Circuit B
Figure 6. Defi nition of Mixed-Mode S-Parameters Reported for Test Circuit B
S xyAB
S xyAB =
STIMULUS PORT NUMBER
RESPONSE PORT NUMBER
STIMULUS PORT MODE
RESPONSE PORT MODE
d: DIFFERENTIAL MODE (BALANCED)
c: COMMON MODE (BALANCED)
x MODE SIGNAL OUTPUT ON PORT A
y MODE SIGNAL INPUT ON PORT B
MODE
6412 F06
TO BUFFER
AMP
150Ω0.3pF
0.3pF
8pF
5Ω 5Ω
5Ω 5Ω
+OUT
–OUT
6412 F06
LOWPASS FILTER
150Ω
g
m
300Ω
DIFFERENTIAL
MODE ADMITTANCE
IDEAL 1:1
TRANSFORMER
WITH
CENTER TAP
COMMON MODE
ADMITTANCE
175Ω
190Ω
+OUT
–OUT
Z
OUT
1.5pF
5pF 4pF
6412 F08
1nH
1nH
APPLICATIONS INFORMATION