The difference between a Root Mean Square (RMS) detector and a log detector is the type of signal characteristic they measure and how they process the signal. An RMS detector calculates the average power of an RF signal over time by squaring the instantaneous values, taking the average, then calculating the square root of the result.
This method provides a measurement of the continuous power level of the signal, useful for applications such as power measurements in communications systems or audio processing.
A log detector, on the other hand, measures the logarithm of the instantaneous signal strength. This type of detector is advantageous because it can compress a wide range of signal levels into a smaller range of output voltages, making it suitable for applications where a large dynamic range of signal resistances must be processed or displayed logarithmically.
Log detectors are commonly used in RF and microwave receivers, spectrum analyzers, and other measuring instruments to provide a logarithmic response to signal power levels.
An RMS detector is designed to measure the root mean square value of an RF signal, which represents the average power level of the signal over a given period of time. It integrates signal strength over time, providing a steady-state measurement of signal strength.
RMS detectors are widely used in applications requiring accurate and stable power measurements, such as in power amplifiers, modulation analysis and audio systems where understanding the average power level of the signal is crucial.
A log detector, also known as a log detector, works by converting the power level of the input RF signal to a logarithmic output voltage or current proportional to the logarithm of the signal power.
This type of detector is particularly useful in applications requiring wide dynamic range measurements, where it can compress large variations in signal power into a linear or semi-logarithmic response. Log detectors are commonly used in RF communications systems, radar receivers, spectrum analyzers and other instruments requiring precise measurement and display of signal power levels.
The detector used in microwave frequencies often depends on the specific application and requirements. However, a common type of detector used in microwave frequency applications is the Schottky diode detector.
Schottky diode detectors are semiconductor devices that operate efficiently at high frequencies, including microwave bands. They are used to detect and measure RF and microwave signals in various applications, such as radar systems, microwave communications links, and satellite communications equipment. Schottky diode detectors offer fast response times and good sensitivity, making them suitable for high-frequency RF and microwave measurement applications