1 Introduction

The AFE7769D, based on zero-IF sampling architecture, offers a Digital Pre-Distortion (DPD) algorithm for improved signal quality. Additionally, the device features proven results for next-generation base stations and adjacent communications infrastructures, making it preferred for massive MIMO and beamforming technologies.

Figure 1-1 Beam Formed by Adjusting the Phase Between Time-Synchronous Antennas

The AFE7769D is a pin-compatible family of high performance, multichannel transceivers, integrating four direct up-conversion transmitter chains, four direct down-conversion receiver chains, two wideband RF sampling digitizing auxiliary chains (feedback paths) along with low-power Digital Pre-Distortion (DPD) engine for Power Amplifier (PA) linearization. The integrated DPD engine corrects the distortion due to PA nonlinearity for signals up to 300MHz instantaneous bandwidth and 730MHz DPD expanded bandwidth. The high dynamic range of the transmitter and receiver chains enables wireless base stations to transmit and receive 2G, 3G, 4G, and 5G signals.

The device also facilitates integrated QMC (quadrature mismatch compensation) algorithm which is capable of continuously monitoring and correcting I and Q imbalance mismatch without the need to inject any specific signals or perform offline calibration.

The synthesizer section integrates four fractional-N RF PLLs that can generate four different RF LOs, allowing the device to support up to three different bands.

For phased array applications, the device verifies deterministic and reliable phase using Sysref. Sysref helps synchronize multiple AFEs, thus proving it to be useful in applications like ground stations, satellite communications, and wireless infrastructures.