AS3911 datasheet(145/159 Pages) AMSCO

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ams Datasheet

Page 145

[v2-11] 2016-Jun-13

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AS3911 − Application Information

Figure 126:

Connection of Tuning Capacitors to the Antenna LC Tank in Case of Single (left) and Differential

Driving (right)

Antenna Tuning Using ‘Antenna Calibration Control’ Register

There is also a possibility to control the position of the TRIM

switches by writing the Antenna Calibration Control Register.

When the bit trim_s of this register is set to 1 position of the

trim switches is controlled by bits tre_3 to tre_0.

Using this register and performing phase and amplitude

measurements (using direct commands Measure Phase and

Measure Amplitude) different tuning algorithms can be

implemented in the external controller.

TRIM1_0

TRIM1_1

TRIM1_2

TRIM1_3

RF01

RF02

RFI1

RFI2

Antenna

TRIM2_3

TRIM2_2

TRIM2_1

TRIM2_0

TRIM1_0

TRIM1_1

TRIM1_2

TRIM1_3

RF01

RF02

RFI1

RFI2

½ Antenna

TRIM2_3

TRIM2_2

TRIM2_1

TRIM2_0

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