LMH2832 Datasheet, PDF (34/46 Pages) Texas Instruments – LMH2832 Fully Differential, Dual, 1.1-GHz, Digital Variable-Gain Amplifier

LMH2832
SBOS709A – JULY 2016 – REVISED JULY 2016
10.2.1.3 Application Curve
-40
-50
Channel A to B
Channel B to A
-60
-70
-80
-90
-100
-110
0
50 100 150 200 250 300 350 400 450 500
Frequency (MHz)
D037
Figure 62. Amplifier Dual Channel Isolation Presented to ADC Interface
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10.2.2 IQ Receiver
The LMH2832 is a dual-channel device; therefore, the device has excellent gain and phase matching between
channels A and B. This matching makes the LMH2832 an excellent choice for systems that require two matched
channels (such as an IQ demodulation receiver), as shown in Figure 63. For an IQ system, both the gain and
phase must match for the real and imaginary channel. When using two single-channel amplifiers, the matching
characteristics are subject to process lot and packaging variations for two individual devices, and there is often
no way to make sure that the amplifiers match without testing each amplifier. However, the dual-channel
architecture of the LMH2832 allows for much tighter gain and phase matching with minimal crosstalk effects. For
more matching information, see the Electrical Characteristics table.
RF IN
I Channel
LPF
LMH2832
ADS54J60
LPF
Q Channel
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Figure 63. IQ Receiver Block Diagram
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