IWR1443: Receiver's maximum input power

Hello,
There are two power level inputs, depending on the Quadrature Mixer output.
Rx RF -> LNA -> Quadrature Mixer -> HPF -> Buffer -> LPF -> DeltaSigma ADC.

The 1db compression point for signals filtered out by HPF is -5dbm. Section 5.7 RF specification in the datasheet.

The 1db compression point for inband signals (after HPF) is based on the LNA setting, see Figure 5-1.

Regards,
Joe Quintal

Hello,

Normally if you want to have a single patch antenna, there is both a Tx patch, and an Rx patch antenna, normally there is a GND shield between them.

On the TI EVM IWr1443 you can see this on the EVM, the Rx antennas left to right are Shield, Rx1, Rx2, Rx3, Rx4, Shield, then the Tx antennas

Tx1, Tx2(elevated), Tx3.

You have two choices:

   a) If you have a single patch for both Tx and Rx, you would use a Circulator  Tx RF port -> Circ Tx -> Patch Antenna

                                                                                                                              Rx RF port <- Circ Rx <-

       normally circulators are used when a waveguide is used for a horn antenna.

   b) the preferred approach is to have a single Rx patch antenna, shield strip, and single Tx patch antenna.  In this manner, the antenna port is directly connected to one Rx port.

                                                                                                                              Tx RF port -> Grounded Coplanar Waveguide -> stripline -> Tx patch antenna

                                                                                                                               Rx RF port <- Grounded Coplanar Waveguide <- stripline <- Rx patch antenna

The connections and dimensions for the (b) standard approach are described in the TImmwave_Radarsensor_RFPCBDesign_Manuf_Validation, spracg5.

Unless you have done electromagnetic HFSS simulations or have a special circuit, the Tx and Rx are not directly connected.

Regards

Joe Quintal

                      

Hello, Given the transport of P1 to an unused Rx ball, I would use a power divider, if this is 1/4, send the divided 1/4 to unused Rx.
Regards,
Joe Quintal

Hello,
I have sent a note to the RF designer. I will post when I get his answer.
Regards,
Joe Quintal