The ADMV4680 is a Ku frequency band, half-duplex beamforming
chip. The chip contains a single port network interface that is used
for both transmit and receive, a four-way splitter for both transmit
and receive, and a T/R switch to separate transmit and receive circuits.
A central digital controller allows the core chip to adjust gain
and phase of each channel. In a four-channel configuration, the
core chip receive path combines the four phase-adjusted signals
into a common RF port.
In the transmit mode, the four-channel chip distributes the signal
from the common RF port to four different antenna ports, adjusting
the gain and phase for each path. Transmit and receive signals
can be combined with the signals from other beamformer chips
to form a full phased array antenna. The ADMV4680 contains
four detectors at the four outputs. Each detector can be turned
off/on separately to save the power consumption. In addition, the
ADMV4680 has an integrated temperature sensor with less than
10°C accuracy.
In the receive mode, the ADMV4680 shows a typical noise figure of
1.9 dB at 25°C and 12.7 GHz, including the off-chip input matching
network, and typically consumes 78 mW. In the transmit mode, the
beamformer shows a typical output compression point (P1dB) of
9.5 dBm while the typical power consumption is 108 mW.
For gain and phase programmability, the ADMV4680 has several
control options requiring at least 72 serial port interface (SPI) clock
cycles to program for 6-bit and 8-bit phase resolution.
APPLICATIONS
10 GHz to 15 GHz satellite communication system
