ADL8113ACCZ-R7 datasheet(34/37 Pages) AD

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Data Sheet

ADL8113

THEORY OF OPERATION

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Rev. 0 | 34 of 37

The ADL8113 integrates an amplifier with two switching networks

located at the RF input and output. The amplifier, which is internally

AC-coupled on its input and output, uses a gallium arsenide (GaAs)

LNA die. The switching network employs robust silicon-on-insulator

(SOI) technology for fast switching and a short settling time. This

integrated solution has four different signal path modes available:

internal amplifier, internal bypass, External Bypass A, and External

Bypass B. Signal path modes are controlled through the VA and

VB digital pins. The internal amplifier is biased up by applying

5V to VDD1 and by connecting a bias resistor between VDD1

and RBIAS. The reflective switch network is powered by applying

+3.3V and −3.3V to VDD2 and VSS2, respectively. DC bias to the

switches is independent of the LNA. Turning off the bias to VDD1

that controls the LNA provides better isolation between RF ports.

SIGNAL PATH MODES FOR DIGITAL CONTROL

INPUTS

Figure 116 through Figure 119 show the signal path modes for the

digital control inputs, while Table 12 details these modes for the

digital control inputs.

Figure 116. Internal Amplifier Mode, VA = 0V and VB = 0V

Figure 117. Internal Bypass Mode, VA = 3.3V and VB = 3.3V

Figure 118. External Bypass A Mode, VA = 0V and VB = 3.3V

Figure 119. External Bypass B Mode, VA = 3.3V and VB = 0V

Table 12. Truth Table for the Signal Path Modes for the Digital Control Inputs

Mode Name

Digital Control

Signal Path Mode

Internal Amplifier

Low

RFIN to RFOUT through the amplifier path

Internal Bypass

High

RFIN to RFOUT through the bypass path

External Bypass A

Low

High

RFIN to OUT_A and IN_A to RFOUT

External Bypass B

High

Low

RFIN to OUT_B and IN_B to RFOUT

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