R2000 datasheet(24/75 Pages) ETC

24 / 75 page

Indy® R2000 Electrical, Mechanical, & Thermal Specification

Figure 4-10: Detailed TX to RX (Self Jammer) Path Block Diagram

11 dB pad

1 dBm

31 dBm

+30 dB

Indy Reader Chip

-10

10 dB

return

loss

-1 dB

dBm

10 dBm

dBm

Self Jammer Path

LO Path

Balun and

matching

0/90

10 dB

coupler

Balun and

matching

Balun and

matching

6 dB SAW

filter/Pad

7 dBm

-6 dB

KEY:

5.3.2 TX to LO (Self Jammer Cancellation) Path

The TX to LO or “Self Jammer Cancellation” path is the path taken by the transmitted high power signal that is

coupled through the directional coupler

towards the reader’s LO port. Example losses and gains of this signal along

the path are shown in Figure 4-11. These values are approximately based on the configuration used in the R2000

development kit and reference design. The path gains and losses are described below. The gains and losses are the

same as the TX to RX path until the signal hits the directional coupler.

The TX signal exits the Indy

Reader chip’s differential TX pins at the user specified power level.

The signal passes through the TX balun and matching network, with a certain amount of loss, for a power

level of 7 dBm.

The signal passes through the SAW filter or pad (depending on configuration), attenuated by 6 dB, for a

power level of 1 dBm.

The signal is amplified by 30 dB by the external PA, for a power level of 31 dBm.

The signal passes through the directional coupler to the coupled port, with an attenuation of 10 dB, for a

power level of 21 dBm.

The signal is attenuated by 11 dB by the pad, for a power level of 10 dBm.

This attenuation is selected such that the amplitude of the LO signal will be equal to the maximum

expected self jammer signal at the RX port, as described in section 5.1.5.

The 10 dBm signal passes through the balun and matching network, again with the balun’s characteristic

loss, and enters the Indy reader chip’s differential LO port.

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