Design of open-loop peak detector based on LT1190 chip

Memory chip

A detector is a device that detects some useful information in a wave signal. A device used to identify the presence or variation of a wave, oscillation, or signal. The detector is typically used to extract the information carried. The detector is divided into an envelope detector and a synchronous detector. The output signal of the former is in correspondence with the envelope of the input signal, and is mainly used for demodulation of the standard amplitude modulation signal. The latter is actually an analog multiplier. In order to obtain demodulation, an additional oscillating signal (coherent signal) identical to the carrier of the input signal is required. Synchronous detectors are mainly used for demodulation of single-sideband AM signals or demodulation of vestigial sideband AM signals.
In the open-loop detector, D1 is a detection diode, D2 is a level shift compensation diode, load resistor RL is connected to -5V, and the same resistance bias resistor R8 is also connected to -5V, which is used to compensate the diode Provide bias. The same resistance of these resistors ensures that the diode's voltage drop is equal. The resistance of RL and R is small (1~10KΩ). Provides fast response, but at the expense of poor low frequency accuracy, the resistance of RL and R can provide good low frequency accuracy, but it will make the amplifier's response slow, resulting in poor high frequency accuracy, adding a feedback capacitor C A good intention can be obtained, and C increases the slew rate at the (-) input.