R2000 datasheet(22/75 Pages) ETC

22 / 75 page

Indy® R2000 Electrical, Mechanical, & Thermal Specification

compression point requirement. A high impedance tap at the output of the PA is implemented to generate the LO_in

signal used to drive the RX mixers.

Figure 4-7: Mono-static Antenna Scenario

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A second scenario allows separate antenna connections for receive and transmit as shown in Figure 4-8. The

isolation between the receive and transmit antenna is 25

–30 dB; therefore, the in-band blocker caused by the CW

transmit signal is on the order of +0 dBm. This scenario significantly reduces the compression requirements on the

receiver and allows for a more sensitive receiver. A high impedance tap at the output of the PA is implemented to

generate the LO_in signal used to drive the RX mixers.

Figure 4-8: Bi-static Antenna Scenario

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5.3

RF Transmit and Receive Path Configuration

The previous section provided a simplified explanation of the external circuitry required in the RF trans mit and

receive paths. It ignored topics such as differential signals, gains and losses in the paths, and matching. This section

elaborates slightly on those concepts.

A more detailed view of a single antenna configuration is shown in Figure 4-9. Values shown are taken from the

R2000 development kit. In this figure, the TX, RX, and LO ports are shown as differential, with a balun and

associated matching networks to translate to single-ended signals. The LO and RX/Self-jammer paths are shown in

blue and orange, respectively. The details of the LO and RX paths are shown in the following subsections.

R2000 Datasheet(PDF) 22 Page - List of Unclassifed Manufacturers