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| AD9364 软件定制无线电(SDR)宽带收发器开发方案 |
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| 文章来源： 更新时间：2014/4/8 13:54:00 |
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ADI公司的AD9364是高性能高度集成RF捷变收发器,设计用于3G和4G基站.器件集成了具有混合基带的RF前端以及频率合成器,12位ADC和DAC,工作频率70MHz到6.0GHz,包括了大多数许可证频段和无许可证频段,支持通道带宽从200kHz到56MHz,主要用在点对点通信系统,飞蜂窝/特微蜂窝/微蜂窝基站,遥控无线电,软件定制无线电(SDR),测试测量设备,雷达,卫星调制解调器等.本文介绍了AD9364主要特性,框图以及AD9364软件开发套件AD-FMCOMMS4-EBZ指标和特性,电路图表与材料清单.
The AD9364 is a high performance, highly integrated radio frequency (RF) Agile Transceiver™ designed for use in 3G and 4G base station applications. Its programmability and wideband capability make it ideal for a broad range of transceiver applications. The device combines an RF front end with a flexible mixed-signal baseband section and integrated frequency synthesizers, simplifying design-in by providing a configurable digital interface to a processor. The AD9364 operates in the 70 MHz to 6.0 GHz range, covering most licensed and unlicensed bands. Channel bandwidths from less than 200 kHz to 56 MHz are supported. The direct conversion receiver has state-of-the-art noise figure and linearity. The receive (Rx) subsystem includes independent automatic gain control (AGC), dc offset correction, quadrature correction, and digital filtering, thereby eliminating the need for these functions in the digital baseband. The AD9364 also has flexible manual gain modes that can be externally controlled. Two high dynamic range ADCs digitize the received I and Q signals and pass them through configurable decimation filters and 128-tap FIR filters to produce a 12-bit output signal at the appropriate sample rate.
The transmitter uses a direct conversion architecture that achieves high modulation accuracy with ultralow noise. This transmitter design produces a Tx EVM of ≤−40 dB, allowing significant system margin for the external power amplifier (PA) selection. The on- board transmit (Tx) power monitor can be used as a power detector, enabling highly accurate Tx power measurements. The fully integrated phase-locked loops (PLLs) provide low power fractional-N frequency synthesis for all Rx and Tx channels. All VCO and loop filter components are integrated. The core of the AD9364 can be powered directly from a 1.3 V regulator. The IC is controlled via a standard 4-wire serial port and four real-time input control pins. Comprehensive power-down modes are included to minimize power consumption during normal use. The AD9364 is packaged in a 10 mm × 10 mm, 144-ball chip scale package ball grid array (CSP_BGA).
AD9364主要特性:
RF 1 × 1 transceiver with integrated 12-bit DACs and ADCs
Band: 70 MHz to 6.0 GHz
Supports time division duplex (TDD) and frequency division duplex (FDD) operation
Tunable channel bandwidth (BW): <200 kHz to 56 MHz
3-band receiver: 3 differential or 6 single-ended inputs
Superior receiver sensitivity with a noise figure of <2.5 dB
Rx gain control
Real-time monitor and control signals for manual gain
Independent automatic gain control 2-band differential output transmitter
Highly linear broadband transmitter
Tx EVM: ≤−40 dB
Tx noise: ≤−157 dBm/Hz noise floor
Tx monitor: ≥66 dB dynamic range with 1 dB accuracy
Integrated fractional-N synthesizers
2.4 Hz maximum local oscillator (LO) step size
Multichip synchronization
CMOS/LVDS digital interface
AD9364应用:
Point to point communication systems
Femtocell/picocell/microcell base stations
Wireless communications demonstration and learning tool
Remote radio head
Software-defined radio
Satellite modems
Test and measurement equipment
Radar and advanced imaging
General purpose data acquisition
图1. AD9364框图
AD9364软件开发套件AD-FMCOMMS4-EBZ
The AD-FMCOMMS4-EBZ provides software developers and system architect with a single 1 x 1 transceiver platform that can be software-configured for wideband tuning as well as narrowband RF performance.
In the wideband configuration, the AD-FMCOMMS4-EBZ will operate over the full 70 MHz to 6 GHz tuning range of the AD9364, however, the RF performance expectations of this configuration must be tempered with the very wide band front end. It will meet the AD9364 datasheet specifications at 2.4 GHz, but does not over the entire RF tuning range that the board can support. Typical performance data for the platform’s entire tuning range is published within the board documentation. This configuration is primarily intended for system investigation and bringing up various waveforms from a software team before custom hardware is complete. The objective being for designers to see waveforms, but not being concerned about the last 1dB or 1% EVM of performance.
The AD-FMCOMMS4-EBZ can also be user-configured for optimum performance in the 2400 – 2500 MHz band. In this configuration it may exhibit diminished RF performance on tuned frequencies or programmed configurations, outside of this band. This configuration is primarily intended to provide RF engineers with the ability to connect the AD9364 to an RF test bench (Vector Signal Analyzer, Signal generator, etc.) and achieve its optimum performance. The AD-FMCOMMS4-EBZ is a high-speed 1 x 1 agile RF transceiver analog FMC module software-tunable over the 56 MHz to 6 GHz band.
图2. AD-FMCOMMS4-EBZ外形图
AD-FMCOMMS4-EBZ指标和特性:
Software tunable across wide frequency range (70 MHz to 6.0 GHz) with a channel bandwidth of <200 kHz to 56 MHz.
Phase and frequency synchronization on both transmit and receive paths
Allows high channel density
Powered from single FMC connector
Supports MIMO radio, with less than 1 sample sync on both ADC and DAC
Includes schematics, layout, BOM, HDL, Linux drivers and application software
Supports add on cards for spectrum specific designs (PA, LNA, etc.)
AD-FMCOMMS4-EBZ应用:
General purpose design suitable for any software-designed radio application
MIMO radio
Point to point communication systems
Femtocell/picocell/microcell base stations
WiFi
ISM
图3. AD-FMCOMMS4-EBZ电路图(1)
图4. AD-FMCOMMS4-EBZ电路图(2)
图5. AD-FMCOMMS4-EBZ电路图(3)
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