R2000 datasheet(25/75 Pages) ETC

25 / 75 page

Indy® R2000 Electrical, Mechanical, & Thermal Specification

Figure 4-11: Detailed TX to LO (Self Jammer Cancellation) Path Block Diagram

11 dB pad

1 dBm

31 dBm

21 dBm

10 dBm

-11 dB

-10 dB

+30 dB

Indy Reader Chip

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:

5.4

RF Power Detection

There are power detectors at the input of the LO_in, Rx_in, and Detector signals in the Indy R2000. In the single

antenna configuration (see Figure 4-7), the power detector at the LO_in signal performs the forward power detection

function, and the power detector at the Rx_in signal is for the reverse power detection. The power detector at the

Rx_in signal can also be used to implement a rough wideband LBT function with the transmitter turned off. A small

RF amplifier may be switched on to slightly improve the sensitivity of the LBT detector. The peak detectors at the

output of the IF amplifiers are connected to the auxiliary (AUX) ADC and can also be used to perform rough LBT.

In dual antenna configuration (see Figure 4-8), the power detector at the LO_in signal performs the forward power

detection function. The power detector at the detector signal measures the reverse power detection via a directional

coupler. The power detector at the Rx_in signal can be used to implement a rough wideband LBT function with the

transmitter turned off. A small RF amplifier may be switched on to slightly improve the sensitivity of the LBT detector.

There are three power detection functions provided in the Indy R2000 reader chip, listed below.

5.4.1 Forward power detection for transmit power calibration

The power is tapped after the PA using the same high impedance node used to generate the RX LO signal. This

power detection is part of the transmit power calibration as well as part of the PA regulator loop that controls the

voltage supply for the PA.

5.4.2 Reverse power detection for measuring antenna reflection

If the controller detects a severe mismatch, the controller shuts down the transmit PA to avoid damage.

5.4.3 Rough wideband LBT

High power (~ -30 dBm) activity is detected in the complete receive band, as defined by the external band select

filter, and in the IF band following the down-conversion mixers.

R2000 Datasheet(PDF) 25 Page - List of Unclassifed Manufacturers

R2000 Datasheet(HTML) 25 Page - List of Unclassifed Manufacturers

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75

Datasheet Download

Link URL