Analog Devices: CN0178 Reference Design for Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System

e14 Contributor — Sun, 27 Oct 2013 06:00:51 GMT

Current Revision posted to Documents by e14 Contributor on 10/27/2013 6:00:51 AM

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Software Tools

Kit Overview

The EVAL-CN0178-SDPZEVAL-CN0178-SDPZ Evaluation board is a Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System. It uses the ADL5902ADL5902 TruPwr™ detector to measure the rms signal strength of RF signals with varying crest factors (peak-to-average ratio) over a dynamic range of approximately 65 dB and operates at frequencies from 50 MHz up to 9 GHz.

The measurement result is provided as serial data at the output of a 12-bit ADC (AD7466AD7466). A simple 4-point system calibration at ambient temperature is performed in the digital domain. The interface between the RF detector and the ADC is straightforward, consisting of two signal scaling resistors and no active components. In addition, the ADL5902ADL5902 internal 2.3 V reference voltage provides the supply and reference voltage for the micropower ADC. The AD7466BRTZ-R2AD7466BRTZ-R2 has no pipeline delay and is operated as a read-only SAR ADC. The overall circuit achieves temperature stability of approximately ±0.5 dB.

The circuit evaluation uses the EVAL-CN0178-SDPZEVAL-CN0178-SDPZ circuit board and the EVAL-SDP-CB1ZEVAL-SDP-CB1Z System Demonstration Platform (SDP-B) evaluation board. The two boards have 120-pin mating connectors, allowing for the quick setup and evaluation of the circuit’s performance. The EVAL-CN0178-SDPZ board contains the circuit to be evaluated, as described in this note, and the SDP evaluation board is used with the CN0178 evaluation software to capture the data from the EVAL-CN0178-SDPZ circuit board.

Key Applications: Communications, Radar

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Development Tools

PC with a USB port and Windows® XP or Windows Vista® (32-bit), or Windows® 7 (32-bit)
EVAL-CN0178-SDPZEVAL-CN0178-SDPZ Circuit Evaluation Board
EVAL-SDP-CB1ZEVAL-SDP-CB1Z SDP Evaluation Board

- Blackfin Processor ADSP-BF527
- USB 2.0 Interface to PC
- JTAG header footprint
- 32MB SDRAM
- 2 x Small Footprint 120 Pin Connectors
- Configurable Peripheral Interfaces - SPI - SPORT - I2C - GPIOs - Parallel - Timers

CN0178 Evaluation Software
Power supply: +6 V, or +6 V “wall wart”
Environmental chamber
RF signal source
Coaxial RF cable with SMA connectors

Technical Documents

Learning Center

Type	Description
User Manual	ADI: User Manual (CN-0178) for Software-Calibrated, 50 MHz to 9 GHz, RF Power Measurement System
User Guide	ADI: User Guide for EVAL-SDP-CB1Z
Datasheet	ADI: Datasheet for ADL5902 50 MHz to 9 GHz 65 dB TruPwr Detector (Rev A)
Datasheet	ADI: Datasheet for AD7466/AD7467/AD7468 1.6 V, Micropower 12-/10-/8-Bit ADCs (Rev C)
Datasheet	ADI: Datasheet for AD7466 Known Good Die (Rev 0)
Selection Guide	ADI: Selection Guide for RF/IF IC
Application Note	ADI: Application Note (AN-1040) for RF Power Calibration Improves Performance of Wireless Transmitters

Design Elements

Type	Description
Schematics	ADI: Schematics for EVAL-CN0178-SDPZ Evaluation Board
Layout	ADI: Layout File for EVAL-CN0178-SDPZ
BOM	ADI: BOM File for EVAL-CN0178-SDPZ Evaluation Board
Application Library	ADI: Application Library for BeMicro FPGA Project (CN0178) with Nios driver
Reference Design	ADI: Reference Design for CN0178 FMC-SDP Interposer and Evaluation Board / Xilinx KC705

Video

www.youtube.com/watch

Kit Features

Features of EVAL-CN0178-SDPZEVAL-CN0178-SDPZ RF Power Measurement System:

ADL5902 TruPwr™ Detector to measure the rms signal strength of RF signals with varying crest factors (peak-to-average ratio) over a dynamic range of approximately 65 dB and operates at frequencies from 50 MHz up to 9 GHz.
- Accurate rms-to-dc conversion from 50 MHz to 9 GHz
- Single-ended input dynamic range of 65 dB
- No balun or external input matching required
- Waveform and modulation independent, such as GSM/CDMA/W-CDMA/TD-SCDMA/WiMAX/LTE
- Linear-in-decibels output, scaled 53 mV/dB
- Transfer function ripple: <±0.1 dB
- Temperature stability: <±0.3 dB
- Power-down capability to 1.5 mW
The measurement result is provided as serial data at the output of a 12-bit ADC (AD7466AD7466). A simple 4-point system calibration at ambient temperature is performed in the digital domain.
- Specified for VDD of 1.6 V to 3.6 V
- Low power, No pipeline delays, Automatic power-down
- Fast throughput rate: 200 kSPS
- Wide input bandwidth: 71 dB SNR at 30 kHz input frequency
- Flexible power/serial clock speed management
- High speed serial interface: SPI/QSPI™/MICROWIRE™/DSP compatible
- Power-down mode: 8 nA typical
The RF signal being measured is applied to the input of the ADL5902
The power supply voltage and reference voltage for the AD7466BRTZ-R2AD7466BRTZ-R2 12-bit ADC are provided by the ADL5902 internal 2.3 V reference.
The overall circuit achieves temperature stability of approximately ±0.5 dB.

Kit Contents

The Analog Devices EVAL-CN0178-SDPZEVAL-CN0178-SDPZ supplied with below contents:

Evaluation Board

Tags: eval-cn0178-sdpz, cn0178, adl5902, eval-sdp-cb1z, ad7466, analog_devices