Two-transmit, two-receive, 400MHz to 6GHz, RF-sampling AFE

The AFE7922

is a high performance, wide bandwidth multichannel transceiver, integrating two RF sampling

transmitter chains and two RF

sampling receiver chains. The high dynamic range of the transmitter and receiver

chains allows the device to generate and receive 3G, 4G, and 5G signals from

wireless base stations, while the wide bandwidth capability of the AFE7922 is designed for multiband 4G and 5G base

stations.

The TX signal paths support

interpolation and digital up conversion options that deliver up to 400MHz of signal

bandwidth per TX channel. The output of the DUCs drives a 12GSPS DAC (digital to

analog converter) with a mixed mode output option to enhance 2nd Nyquist

operation. The DAC output includes a variable gain amplifier (TX DSA) with 40dB

range and 1dB analog and 0.125dB digital steps.

Each receiver chain includes a 25dB

range DSA (Digital Step Attenuator), followed by a 3GSPS ADC (analog-to-digital

converter). Each receiver channel has an analog peak power detector and various

digital power detectors to assist an external or internal autonomous automatic gain

controller, and RF overload detectors for device reliability protection. Flexible

decimation options provide optimization of signal bandwidth of up to 400MHz per RX

channel.