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Photoelectric conversion circuit design and optimization

In Electronic Infomation Category: P | on April 13,2011

Abstract: The photoelectric conversion circuit preamplifier and MAX232ACSE-T datasheet and main amplifier circuit design detailed analysis of the study, given the circuit amplification, filtering, noise reduction and MAX232ACSE-T price and other optimization methods to achieve that will be useful to separate signal from noise and MAX232ACSE-T suppliers and output purposes. From the principle of the photoelectric conversion circuit board design to final manufacturing process parameters affect its performance and stability factors were discussed in depth, made the circuit device selection, arrangement, wiring, and noise reduction methods such as the selection criteria and basis.

Photovoltaic technology is the traditional optical technology and modern electronic technology and computer technology, a combination of a high-tech. Photoelectric conversion circuit as the core of the optical detection technique has been widely applied to the military, industry, agriculture, environmental science, medical and aerospace fields. The so-called photoelectric conversion device is based on the photodiode, the diode by radiation flux changes in the amount of light into the corresponding current, and then through the preamplifier, the main amplification circuit to further optimize the useful signal follow-up, and finally realized with the host computer connection with the corresponding algorithm. Thus, any optical detection system, the photoelectric conversion circuit design and optimization are the most important, its stability and performance parameters will determine the reasonableness of the design success of the detection system.

1 photoelectric conversion - pre-amplifier design

Be light in the photodiode, it will produce a small current proportional to illumination, it is a good light - electric sensors. Photodiode can work in 2 modes, one zero-bias photovoltaic mode; one is anti-biased photoconductive mode, the specific circuit shown in Figure 1. In the photovoltaic mode, the photodiode can be very precise linear work; in photoconductive mode, the photodiode to achieve a higher switching speed, but at the expense of linearity; the same time, anti-bias mode, even in the photodiode No light conditions will produce a very small dark current, dark current may introduce input noise. Therefore, use of photovoltaic mode. Photodiode

ideal characteristics of a constant current source, when its output characteristics of the load resistance is zero is better, but by the ideal pre-amplifier circuit amplifiers have a short virtual, virtual-off! Concept, the input impedance R in = Rf / (1 + A), where, A is the op amps open loop gain, Rf is the feedback resistor. In general, A> = 10 6 < / SUP> , so the R in 0; that guarantees photodiode in photovoltaic mode, the linear operating characteristics. Photodiode through the feedback resistor is connected with the operational amplifier, to produce a weak current through the feedback resistor Rf form a larger drop in order to achieve change in flux - Light current - voltage of the I / V preamplifier conversion.

Figure 1 photodiode mode

Photodiode selected on the basis:

photodiode equivalent circuit of Figure 2

Figure 2, I sc for the photocurrent; Rd is the diode resistance; Cd for the diode junction capacitance; I ns for the diode shot noise current; I nd the thermal resistance for the diode noise current. Photodiode and the follow-up constitute the ideal op-amp preamplifier circuit, the impact of the performance parameters of the main factors are the following:

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