LMH6521 datasheet(34/47 Pages) TI2

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LMH2832

ADS54J60

RF IN

I Channel

Q Channel

LPF

Frequency (MHz)

100

150

200

250

300

350

400

450

500

-110

-100

-90

-80

-70

-60

-50

-40

D037

Channel A to B

Channel B to A

LMH2832

SBOS709A – JULY 2016 – REVISED JULY 2016

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10.2.1.3 Application Curve

Figure 62. Amplifier Dual Channel Isolation Presented to ADC Interface

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.

Figure 63. IQ Receiver Block Diagram

LMH6521 Datasheet(PDF) 34 Page - Texas Instruments

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