The most important characteristics of the diode is conductive in one direction. In the circuit, current can only flow from the diode cathode, negative outflow. The following simple experiment illustrates the forward diode characteristics and 42 datasheet and reverse characteristics. 1) positive characteristics in the electronic circuit, the diode cathode connected to the high potential side, the low potential side connected to the anode, the diode will turn this connection, known as forward bias. Have demonstrated that when both ends of the diode forward voltage is very small, still can not turn on the diode, the forward current flowing through the diode is very weak. Only when the forward voltage reaches the threshold voltage, the diode can be a real turn-on. 2) reverse characteristics in the elec...

Ground when the layout of the first consideration is the "subdivision" that, according to the different supply voltage, digital and 42 datasheet and analog circuits were set up ground. In the multi-layer printed circuit board has a dedicated ground floor, on the ground floor with a "designated ditch" approach to subdivision. However, the subdivision is not completely isolated from the various places, but still need to put in place various short to ground up to ensure the continuity of the electrical ground, short-channel image is sometimes referred to as "bridge . " Bridge should have enough width. layout ground should note the following: (1) multilayer high-speed signal on the signal layer trajectory can not cross the ditch on the ground floor. (2) A / D converter chip, such as only one ground pin, ...