Linear 公司的LTC5564是带比较器的7ns超快响应时间15GHz RF功率检测器，频率范围从600MHz 到15GHz，输入功率电平从-24dBm 到16dBm，75MHz解调带宽，可编程增益设定以改善灵敏度，放大器输出失调电压可调，主要用在802.11a，802.11b，802.11g，802.15和光数据链接，无线数据调制解调器，无线和有线设备的RF信号检测，MMDS和微波链路， 5.8GHz ISM频段无线电以及雷达检测等.本文介绍了LTC5564主要特性， 简化方框图以及600MHz 到15GHz功率检测电路和15GHz演示板电路图.

 UltraFast 7ns Response Time 15GHz RF Power Detector with Comparator

 The LTC5564 is a precision， RF power detector for applications in the 600MHz to 15GHz frequency range. The LTC5564 operates with input power levels from –24dBm to 16dBm. A temperature compensated Schottky diode peak detector， gain-selectable operational amplifier， and fast comparator are combined in a small 16-lead 3mmx3mm QFN package.

 The RF input signal is peak detected and then sensed by both a comparator and amplifier. The comparator provides a 9ns response time to input levels exceeding VREF along with a latch enable/disable function. The gain selectable operational amplifier provides a 350V/μs slew rate and 75MHz of demodulation bandwidth to the analog output. VOUTADJ and VREF pins allow for the adjustment of VOUT offset and VCOMP switch point voltages， respectively.

 LTC5564主要特性:

 Temperature Compensated Schottky RF Peak Detector

 Wide Input Frequency Range: 600MHz to 15GHz

 Wide Input Power Range: –24dBm to 16dBm

 7ns Typical Response Time

 75MHz Demodulation Bandwidth

 Programmable Gain Settings for Improved Sensitivity

 Adjustable Amplifier Output Offset Voltage

 High Speed Comparator with Latch Enable: 9ns Typical Response Time

 16-Lead 3mmx3mm QFN Package

 应用:

 RF Signal Presence Detectors for: 802.11a， 802.11b， 802.11g， 802.15， Optical Data Links，

Wireless Data Modems， Wireless and Cable Infrastructure

5.8GHz ISM Band Radios

MMDS Microwave Links

PA Power Supply Envelope Tracking Control

Fast Alarm

RF Power Monitor

Envelope Detector

Ultra-Wideband Radio

Radar Detector

图1.LTC5564简化方框图

图3.LTC5564 15GHz演示板电路图