AD8363ACPZ-R7 RF/IF and RFID

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AD8363ACPZ-R7 is a high linearity, low noise, logarithmic RF detector which is mainly used in communication system and the wireless field. It is a component of radio frequency (RF) detectors, which compare the incoming RF signal to a fixed reference level, with the output of the difference as a logarithmic function of the input voltage. This type of detector serves a variety of purposes, including for measuring power levels, automatically setting gain levels, and detecting the presence of a signal or noise.

The AD8363ACPZ-R7 is a class of logarithmic RF detectors that uses an analog circuit to measure the power level of an incoming signal. This device provides a linear-in-dB logarithmic output of the detected signal, with dynamics up to 80 dB and a low noise figure. The AD8363ACPZ-R7 can be used in both cellular and WLAN applications and can measure input signals from -60 dBm to +10 dBm with 7 dB Frequency Range.

The working principle of the AD8363ACPZ-R7 is based on a logarithmic amplifier. At the input of this amplifier, an RF signal is applied, which is based on the zero-to-dB input range. The voltage at the output is the logarithm of the input voltage, and this output voltage is compared by a voltage-controlled oscillator (VCO) which generates a frequency output. The frequency output is inversely proportional to the input voltage, resulting in a proportional logarithmic output.

The circuit consists of a differential amplifier in order to accept a differential input signal. The differential input is taken by two NPN transistors and is tuned to the center frequency of the RF signal. The two outputs of the differential amplifier are then connected to a logarithmic amplifier with two trans-impedance amplifiers, and the input is converted to a logarithmic voltage form. Then, the output of the logarithmic amplifier is compared with the voltage-controlled oscillator, which is the circuit’s output or feedback signal.

The AD8363ACPZ-R7 is very useful for communication systems and wireless applications as it offers high linearity and low noise in a wide range of input amplitudes and frequencies. Its logarithmic output can be used in different purposes such as measuring power levels, automatically setting gain levels, and detecting the presence of a signal or noise.

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