**AD8367ARU: A True RMS Responding Power Detector for RF Applications**

In the demanding field of radio frequency (RF) design, accurately measuring signal power is a fundamental challenge. Traditional peak detectors often fall short because they cannot correctly interpret the complex modulated signals prevalent in modern communications. The **AD8367ARU from Analog Devices** stands out as a high-performance solution, engineered specifically as a **true RMS (Root Mean Square) responding power detector** to meet this critical need.

The core innovation of the AD8367ARU lies in its ability to provide an accurate DC output voltage that is directly proportional to the **RMS value of the input signal**. Unlike peak or logarithmic detectors, which can be misled by signal crest factors and modulation types, a true RMS detector delivers a precise measurement of the actual power of a signal, regardless of its waveform. This makes the AD8367ARU exceptionally valuable for measuring complex modulated signals like CDMA, OFDM, and WCDMA, which are common in cellular infrastructure, WiFi systems, and other wireless applications.

Housed in a compact 16-lead TSSOP package, this device operates over a wide frequency range from **1 MHz to 6 GHz**, making it versatile for a vast array of RF applications. It offers an impressive **dynamic range of up to 60 dB**, allowing it to handle signals from very low to very high power levels with consistent accuracy. Its response time is exceptionally fast, typically settling within 10 µs, which is crucial for real-time power control loops in transmitters.

A key feature of the AD8367ARU is its ease of use. It requires a single supply voltage from **2.7 V to 5.5 V** and incorporates an integrated output buffer amplifier. This amplifier can directly drive loads, simplifying interface with analog-to-digital converters (ADCs) or other control circuitry. The device can be configured in two primary modes: as a **measurement device** to provide a voltage corresponding to the input power, or as a **setpoint controller** in a closed-loop automatic gain control (AGC) system to maintain a constant output power.

In practice, the AD8367ARU is indispensable for tasks such as transmitter power control, receiver signal strength indication (RSSI), and test and measurement equipment. Its ability to provide a stable, accurate, and modulation-independent power reading ensures the reliability and efficiency of the entire RF system.

**ICGOOODFIND**

The AD8367ARU is an industry-standard, true RMS power detector that provides unparalleled accuracy for complex modulated signals across a wide frequency and dynamic range, simplifying power measurement and control in sophisticated RF systems.

**Keywords:**

True RMS Responding

RF Power Detection

Dynamic Range

Automatic Gain Control (AGC)

Modulated Signals