A peak and valley detection circuit

Abstract

The invention discloses a detection circuit for a peak value and a valley value. The detection circuit for the peak value and the valley value comprises a peak value detection module, a valley value detection module, an AND gate and a result output module. An input signal is inputted into the peak value detection module and the valley value detection module. A result which is inputted into the peak value detection module and the valley value detection module is inputted into the input terminal of the AND gate in real time. The output terminal of the AND gate is connected to the output module. The peak value detection module is used for comparing the input signal with preset peak value reference voltage. If the input signal is not smaller than the preset peak value reference voltage, a high electric level is outputted, and, otherwise, a low electric level is outputted. The valley value detection module is used for comparing the input signal with the preset valley value reference voltage; if the inputted signal is not greater than the preset valley value reference voltage, the high electric level is outputted, and, otherwise, the low electric level is outputted. The result output module outputs a result according to the signal inputted by the AND gate. The detection circuit for peak value and valley value can fast detect whether the signal peak value achieves an expected value, can effectively prevent interference caused by pulse noise on a detection result and is simple in structure and low in power consumption.

Description

technical field [0001] The invention belongs to the field of signal detection, in particular to a peak value and valley value detection circuit. Background technique [0002] The wireless sensor network is composed of a large number of sensor nodes, and the communication between wireless sensor nodes is realized by a wireless transceiver, which is mainly composed of a radio frequency front-end part and a baseband part. The main function of the radio frequency front-end is to receive and transmit data. The baseband part is mainly for digital signal processing. In different working environments, the effective signal power received by the antenna of the radio frequency receiver changes. In a wireless communication system, due to the influence of various external factors, the signal strength received by the receiver will vary within a large dynamic range. Blocking, and when the signal is too weak, it may be lost, so some detection method is needed to detect the strength of the...

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Problems solved by technology

[0003] The peak detector is a commonly used circuit for detecting signal strength. The charging time constant of the traditional peak detector is very small, and the output voltage of the detector can quickly reach a stable value. However, due to its large discharge time constant, when the input signal When the signal becomes smaller, the output voltage of the detector will remain near the peak value of the signal before the signal becomes smaller for a long period of time, so the traditional peak detector cannot quickly detect the change of the signal, and many radio frequency receivers today Need to be able to quickly switch the gain, such as a Bluetooth receiver, which requires the ability to quickly detect signal changes

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