We consider the step response of the network green laser

The other hand, near the cutoff frequency introduces a positive phase shift, so that a larger stability margin. This will not only improve the stability, but also makes the cut-off frequency of the system to improve. In our system, in order to achieve better monitoring of high frequency noise, and improve system stability, ahead of the correction is very effective. Of course, general use, in the angle of the load effect and the loss of gain commonly used active ahead of the correction. However, ahead of correction is difficult to change the low-frequency characteristics of the system. This requires an additional correction - lag correction. Figure 4-4 shows the RC lead network. Its transfer function: As described above, the description of the lead network, the network can be seen as advance network "reverse network. Here will introduce the selling point of a new kind of green laser pointer .
On the one hand, due to the role of amplitude-frequency negative slope, significantly reduces the bandwidth in exchange for the sacrifice system stability. Other hand, although the frequency curve from the phase of view, correction has a negative displacement, but because of the role in the low frequency parts, will not have a big impact to the system stability margin. In addition, the series features lag correction and no change in the lowest band of the original system, therefore, the steady-state accuracy of the system can not afford with the destructive role. On the contrary, tend to also allow an appropriate increase in the open-loop gain to further improve the system steady-state accuracy. Lag - lead correction. Typically, in the system design at the same time need to introduce the above two correction methods, the role of different frequency components, and comprehensively improve the control performance of the system. It is because of good and high quality and performance.
The network is the superposition of the two networks, both characteristics of the above two networks. In the not to do repeat. As the actual feedback design, using the above basic network principle structure of the PD (proportional-integral), both PID (proportional integral derivative) regulator (otherwise the PD ratio of differential] regulator, which is equivalent to the advance correction due low-frequency nature of the interference signal, and there is no separate use). Obviously, we shipped from the diagram (4-1) put the s-domain expression of a network of resistance and its related container line with the general formula above. Its role is equivalent to lag correction. In the design of the voltage source, due to mainly low-frequency signal processing. It is one of the biggest selling points of this kind of green laser pointer .  In order to avoid some of the high-frequency interference makes the deterioration of stability of the circuit, we have adopted a PI regulator. According to the basic analysis, as required, we have first to prove system stability theory: the rest of the regulation system of the circuit is simplified as a first-order inertial system, its transfer function is: The system has a generally low the characteristics of the system. Since we are using the network constructed by the general resistance and capacitance, it is clear that, left part of the system poles in the s-domain to stabilize the system to meet our first requirement; in changes in regulation and output voltage reference of the voltage source characteristics, we consider the step response of the network  green laser  . It is due to its strict and perfect parameter and technology.