LMH9226

LNA

LNA

LMH9226

Tx AFE

Tx AFE

PA

PA

LMH9226

LNA

LNA

LMH9226

Tx AFE

Tx AFE

PA

PA

Analog Front End

f = 2.2 GHz ± 2.9 GHz

DC-DC Converter

+3.3 V

DC-DC Converter

+3.3 V

LDO

LDO

Transceiver Board

LMH9126

LMH9126

LMH9126

LMH9126

+3.3 V

+3.3 V

11

LMH9126

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The LMH9126 is a differential to single-ended RF gain block amplifier, which works as an active balun in the

transmit path of a 2.2-GHz to 2.8-GHz 5G, TDD m-MIMO or small cell base station. The device replaces the

traditional passive balun and single-ended RF amplifier offering a smaller footprint solution to the customer. TI

recommends following good RF layout and grounding techniques to maximize the device performance.

8.2 Typical Application

The LMH9126 is typically used in a four transmit and four receive (4T/4R) array of active antenna system for 5G,

TDD, wireless base station applications. Such a system is shown in Figure 18, where the LMH9126 is used in

the transmit path as an active balun that converts differential DAC output from Tx AFE to single-ended signal.

Also shown in the figure is the application of LMH9226 chip, which is the counter-part of LMH9126 in the Receive

path.

Figure 18. LMH9126 in a 4T/4R 5G Active Antenna System