The AFE7700 device is a high-performance, multichannel transceiver, integrating four
direct up-conversion transmitter chains, four direct down-conversion receiver chains, and two
wideband RF sampling digitizing auxiliary chains (feedback paths). The high dynamic range of the
transmitter and receiver chains enables high performance wireless transceiver systems.
The low power dissipation and large channel integration of the AFE7700 allows the device
to address the power and size constraints of multi-antenna and phased array systems. The wideband
and high dynamic range feedback path can assist the Digital Pre-Distortion (DPD) of power
amplifiers and IQ correction in the transmitter chain. The fast SerDes speed can reduce the number
of lanes required to transfer the data in and out.
Each receiver chain of the AFE7700 includes a 28-dB range digital step attenuator (DSA),
followed by a wideband passive IQ demodulator, and a baseband amplifier with integrated
programmable antialiasing low pass filters, driving a continuous-time sigma-delta ADC. The RX chain
can receive an instantaneous bandwidth (IBW) up to 200 MHz. Each receiver channel has two analog
peak power detectors and various digital power detectors to assist an external or internal
autonomous AGC control for receiver channels, and a RF overload detector for device reliability
protection. The integrated QMC (quadrature mismatch compensation) algorithm is capable to
continuously monitor and correct for the RX chain I and Q imbalance mismatch without the need to
inject any specific signals or perform offline calibration.
Each transmitter chain includes two 14-bit, 3-Gsps IQ DACs, followed by a programmable
reconstruction and DAC image rejection filter, an IQ modulator driving a wideband RF amplifier with
39-dB range gain control. The TX chain integrated QMC and LO leakage cancellation algorithms,
leveraging the FB path can constantly track and correct for the TX chain IQ mismatch and LO
Each FB path is based on RF sampling architecture, and includes an input RF DSA driving a
14-bit, 3-Gsps RF ADC. The direct sampling architecture provides an inherently wideband receiver
chain and simplifies the calibration of the TX chains impairments. The FB path integrates two
independent NCO that allows a fast switching between two observed RF input bands.
The synthesizer section integrates four fractional-N RF PLL that can generate four
different RF LO, allowing the device to support up to two different bands, each one configured as
two transmitters, two receivers and one feedback paths.