General Receiver Port Interface - Analog Devices ADRV9001 User Manual

Reference Manual
RF PORT INTERFACE INFORMATION
For a wideband match application, because of well-controlled input/output impedance characteristics of the ADRV9001 for the entire range of
its RX/TX operational frequency band, implement the minimal matching network to control undesirable impedance deviation typically associated
with the high side of the frequency range a balun operates. Additionally, select a balun with the same differential side termination impedance
as the impedance of the receiver inputs and transmitter outputs, accomplish a broadband match by avoiding unnecessary impedance
transformation network, which is inherently band-limiting.
Also consider adding additional differential series capacitive components on the balanced side of the balun to facilitate AC-coupling and Pi
match on both sides of the balun, as shown in
For a narrowband impedance match application to filter out signals outside of the frequency band of interest, use the Pi match technique
for the desired bandwidth of impedance match with a selected balun's terminal impedance. Consider the Pi match as two L match networks
back-to-back and allow independent control of Q and impedance ratio obtainable from a matching network. A narrowband matching network
tuned for frequency bands of the receiver and transmitter further improves the out-of-band rejection of a transceiver for frequency duplexed
systems.

GENERAL RECEIVER PORT INTERFACE

The ADRV9001 has two independent receive input channels (Rx1 and Rx2). Both receiver channels can support up to 40 MHz bandwidth and
use a differential signaling interface. Apply the differential input signals to an integrated mixer. The mixer input pins are internally biased to 0.65
V and can be AC- coupled depending on the common-mode voltage level of the external circuit.
The important considerations for the receiver RF port interface are as follows:
1. Device to be interfaced: filter, balun, T/R switch, external LNA, and so on. Does this device represent a short-to-ground at DC?
2. Rx1 and Rx2 maximum safe input power is 18 dBm (peak).
3. Rx1 and Rx2 optimum DC bias voltage is 0.65 V bias to ground.
4. Board Design: reference planes, transmission lines, impedance matching, and so on.
interface circuits. The options in
Rx1 signal names are indicated. Impedance matching can be necessary to obtain data sheet performance levels.
Receiver Port A/B Switching
The ADRV9001 supports a wide range of RF frequencies from 30 MHz to 6 GHz. However, typical RF baluns do not support all frequencies but
only a smaller range. There is a special feature to support switching the receiver A and B ports, which allows to use both of them as receiver
channels, and they can be switched at run time depending on the carrier frequency. Port A and B can be connected to different RF baluns and
RF matching networks to support different RF frequencies. The frequencies are configurable.
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Figure 220.
Figure 220. RF Matching Network with Additional Series AC-Coupling Capacitors
Figure 221 and Figure 222 are valid for all receiver inputs operating in differential mode, though only the
ADRV9001
Figure 221 shows possible differential receiver port
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