A circuit and method for detecting received optical signal strength in a wide dynamic range
A technology with wide dynamic range and signal strength, which is applied in measuring circuits and using electric radiation detectors for photometry, etc., can solve problems such as higher working accuracy requirements, smaller VROP minimum value, difficult circuit design, etc., to achieve high detection The effect of precision and ease of use
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[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.
[0030] The circuit for detecting the intensity of received optical signals in a wide dynamic range in the embodiment of the present invention includes a power supply VDD, a photodiode, a buffer (the buffer in this embodiment uses a Schmitt trigger), a threshold current source, and 4 NMOS (N-Mental-Oxide-Semiconductor, N-type Metal-Oxide-Semiconductor Field Effect) transistors composed of cascode photocurrent mirrors, 4 PMOS transistors (positive channel Metal Oxide Semiconductor, n-type substrate, p-channel , a threshold current mirror of a cascode structure composed of a MOS transistor that carries current through the flow of holes).
[0031] see figure 2 As shown, the power supply VDD is connected to the cathode of the photodiode, the anode of the photodiode is connected to the input terminal of the photocurrent mirror, and the output term...
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