Crest Factor, Peak, and RMS RF Power Measurement Circuit Optimized for High Speed, Low Power, and Single 3.3 V Supply (CN0187)

The circuit shown in Figure 1 measures peak and rms power at any RF frequency from 450 MHz to 6 GHz over a range of approximately 45 dB. The measurement results are converted to differential signals in order to eliminate noise and are provided as digital codes at the output of a 12-bit SAR ADC with serial interface and integrated reference. A simple twopoint calibration is performed in the digital domain.

The ADL5502 is a mean-responding (true rms) power detector in combination with an envelope detector to accurately determine the crest factor (CF) of a modulated signal. It can be used in high frequency receiver and transmitter signal chains from 450 MHz to 6 GHz with envelope bandwidths over 10 MHz. The peak-hold function allows the capture of short peaks in the envelope with lower sampling rate ADCs. Total current consumption is only 3 mA @ 3 V.

The ADA4891-4 is a high speed, quad, CMOS amplifier that offers high performance at a low cost. Current consumption is only 4.4 mA/amplifier at 3 V. The amplifier features true singlesupply capability, with an input voltage range that extends 300 mV below the negative rail. The rail-to-rail output stage enables the output to swing to within 50 mV of each rail, ensuring maximum dynamic range. Low distortion and fast settling time makes it ideal for this application.

The AD7266 is a dual, 12-bit, high speed, low power, successive approximation ADC that operates from a single 2.7 V to 5.25 V power supply and features sampling rates up to 2 MSPS. The device contains two ADCs, each preceded by a 3-channel multiplexer, and a low noise, wide bandwidth track-and-hold amplifier that can handle input frequencies in excess of 30 MHz. Current consumption is only 3 mA at 3 V. It also contains an internal 2.5 V reference.

The circuit operates on a single +3.3 V supply from the ADP121, a low quiescent current, low dropout, linear regulator that operates from 2.3 V to 5.5 V and provides up to 150 mA of output current. The low 135 mV dropout voltage at 150 mA load improves efficiency and allows operation over a wide input voltage range. The low 30 μA of quiescent current at full load makes the ADP121 ideal for battery-operated portable equipment.

The ADP121 is available in output voltages ranging from 1.2 V to 3.3 V. The parts are optimized for stable operation with small 1 μF ceramic output capacitors. The ADP121 delivers good transient performance with minimal board area. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP121 is available in tiny 5-lead TSOT and 4-ball, 0.4 mm pitch halidefree WLCSP packages and utilizes the smallest footprint solution to meet a variety of portable applications.



Figure 1. High Speed, Low Power, Crest Factor, Peak, and RMS Power Measurement System (Simplified Schematic: All connections and Decoupling Not Shown)

Возможности

  • Measures crest factor, peak power, and RMS power
  • Wide frequency range from 450 MHz to 6 GHz
  • Optimized for low power RF monitoring

Файлы

Схемы и диаграммы

Быстро получите общее представление о схемотехнике решения

Печатные платы и ПО

Ускорьте разработку по готовому дизайну

Crest Factor, Peak, and RMS RF Power Measurement Circuit Optimized for High Speed, Low Power, and Single 3.3 V Supply  CN0187

Используемые компоненты

Производитель: Analog Devices Inc.
Наименование
Производитель
Описание Корпус/
Изображение
Цена, руб. Наличие
AD7266BSUZ
AD7266BSUZ
Analog Devices Inc.
Арт.: 201820 ИНФО PDF RD
Доступно: 497 шт.
Выбрать
условия
поставки
12BIT ADC, SAR 2MSPS, SMD, 7266; Resolution, Bits:12bit; Sampling Rate:2MSPS; Channels, No. of:2; Input Type:Differential, Single Ended; Interface Type:Serial, SPI; Voltage, Supply Min:2.7V; Voltage, Supply Max:5.25V; Termination Type:SMD; Case Style:TQFP; Pins, No.…
AD7266BSUZ
497 шт.
(под заказ)
Выбрать
условия
поставки
ADA4891-4ARZ
Analog Devices Inc.
Арт.: 796086 RD
Доступно: 1818 шт.
Выбрать
условия
поставки
ADA4891-4ARZ
1818 шт.
(под заказ)
Выбрать
условия
поставки
AD7266BCPZ
AD7266BCPZ
Analog Devices Inc.
Арт.: 856809 PDF RD
Доступно: 12593 шт.
Выбрать
условия
поставки
Analog to Digital Converters - ADC Dual 2MSPS 12-Bit 3Ch SAR IC
AD7266BCPZ
12593 шт.
(под заказ)
Выбрать
условия
поставки
AD7266BSUZ-REEL7
Analog Devices Inc.
Арт.: 2261864 PDF RD
Доступно: 1858 шт.
Выбрать
условия
поставки
Analog to Digital Converters - ADC Dual 2MSPS 12-Bit 3Ch SAR IC
AD7266BSUZ-REEL7
1858 шт.
(под заказ)
Выбрать
условия
поставки
ADA4891-4ARUZ
Analog Devices Inc.
Арт.: 2275174 PDF RD
Доступно: 11327 шт.
Выбрать
условия
поставки
ADA4891-4ARUZ
11327 шт.
(под заказ)
Выбрать
условия
поставки
AD7266BCPZ-REEL7
AD7266BCPZ-REEL7
Analog Devices Inc.
Арт.: 2290990 PDF RD
Доступно: 5649 шт.
Выбрать
условия
поставки
Analog to Digital Converters - ADC Dual 2MSPS 12-Bit 3Ch SAR IC
AD7266BCPZ-REEL7
5649 шт.
(под заказ)
Выбрать
условия
поставки
ADA4891-4ARZ-R7
Analog Devices Inc.
Арт.: 2389618 RD
Доступно: 10162 шт.
Выбрать
условия
поставки
ADA4891-4ARZ-R7
10162 шт.
(под заказ)
Выбрать
условия
поставки
ADA4891-4WARUZ-R7
Analog Devices Inc.
Арт.: 2389623 RD
Доступно: 8140 шт.
Выбрать
условия
поставки
ADA4891-4WARUZ-R7
8140 шт.
(под заказ)
Выбрать
условия
поставки
ADA4891-4ARUZ-R7
Analog Devices Inc.
Арт.: 2389656 RD
Доступно: 4033 шт.
Выбрать
условия
поставки
ADA4891-4ARUZ-R7
4033 шт.
(под заказ)
Выбрать
условия
поставки
ADL5502-EVALZ
ADL5502-EVALZ
Analog Devices Inc.
Арт.: 2390094 PDF RD
Поиск
предложений
ADL5502, CREST DETECTOR, EVAL BOARD
ADL5502-EVALZ
-
Поиск
предложений
ADL5502ACBZ-P7
Analog Devices Inc.
Арт.: 2390104 RD
Доступно: 13417 шт.
Выбрать
условия
поставки
ADL5502ACBZ-P7
13417 шт.
(под заказ)
Выбрать
условия
поставки