The AD9371 is a highly integrated, wideband RF transceiver
offering dual channel transmitters and receivers, integrated synthesizers, and digital signal processing functions. The IC
delivers a versatile combination of high performance and low power consumption required by 3G/4G micro and macro BTS
equipment in both FDD and TDD applications. The AD9371
operates from 300 MHz to 6000 MHz, covering most of the licensed and unlicensed cellular bands. The IC supports receiver bandwidths up to 100 MHz. It also supports observation receiver and transmit synthesis bandwidths up to 250 MHz to accommodate digital correction algorithms.
The transceiver consists of wideband direct conversion signal
paths with state-of-the-art noise figure and linearity. Each complete receiver and transmitter subsystem includes dc offset correction, quadrature error correction (QEC), and programmable digital
filters, eliminating the need for these functions in the digital
baseband. Several auxiliary functions such as an auxiliary analog-
to-digital converter (ADC), auxiliary digital-to-analog converters (DACs), and general-purpose input/outputs (GPIOs) are integrated
to provide additional monitoring and control capability.
An observation receiver channel with two inputs is included to monitor each transmitter output and implement interference mitigation and calibration applications. This channel also connects to three sniffer receiver inputs that can monitor radio activity in different bands.
The high speed JESD204B interface supports lane rates up to 6144 Mbps. Four lanes are dedicated to the transmitters and four lanes are dedicated to the receiver and observation receiver channels.
The fully integrated phase-locked loops (PLLs) provide high performance, low power fractional-N frequency synthesis for
the transmitter, the receiver, the observation receiver, and the
clock sections. Careful design and layout techniques provide the
isolation demanded in high performance base station applications.
All voltage controlled oscillator (VCO) and loop filter components are integrated to minimize the external component count.
A 1.3 V supply is required to power the core of the AD9371, and
a standard 4-wire serial port controls it. Other voltage supplies provide proper digital interface levels and optimize transmitter
and auxiliary converter performance. The AD9371 is packaged in a
12 mm × 12 mm, 196-ball chip scale ball grid array (CSP_BGA).
Applications
- 3G/4G micro and macro base stations (BTS)
- 3G/4G multicarrier picocells
- FDD and TDD active antenna systems
- Microwave, nonline of sight (NLOS) backhaul systems
