LMH3401 Datasheet, PDF (36/48 Pages) Texas Instruments – LMH3401 7-GHz, Ultra-Wideband, Fixed-Gain, Fully-Differential Amplifier

LMH3401
SBOS695A – AUGUST 2014 – REVISED DECEMBER 2014
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10.2.2.6 Active Balun
The LMH3401 is designed to convert single-ended, 50-Ω source impedance signals to a differential output with
very high bandwidth and linearity, as shown in Figure 67. The LMH3401 can support dc coupling as well as ac
coupling. The LMH3401 is smaller than any balun with low-frequency response and has balance errors that are
excellent over a wide frequency range. As shown in Figure 68, the LMH3401 balance error is better than
–40 dBc up to 1 GHz when used with a 5-V supply.
50-:, Single-Ended
Input
VIN
VREF
:
CM
12.5 :
12.5 :
Device
200 :
:
200 :
:
VREF Equal to
DC Voltage of VIN
PD
Figure 67. Active Balun
Differential
Output
V _OUT+
V _OUT-
0
-10
-20
-30
-40
-50
-60
-70
1
10
100
1000
Frequency (MHz)
Figure 68. Balance Error
3.3V
5V
10000
C008
36
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