How the sensor application circuit reduces noise and interference

Sensor circuit sensor circuit noise and interference sources easily received outside or inside some of the irregular noise or interference signals, in fact, passThe success of Crankshaft Sensor Replacement design and interference design are inseparable.Low-frequency noise is low frequency noise is mainly due to internaldiscontinuities caused by the conductive particles. In particular carbon film resistors, the carbonaceous material is present inside many micro-Small particles, particles are discontinuous, the electric current flows through the resistor will change in conductivity caused by the current changes, the contact does not produce similarOrleans arc flash explosion. In addition, the transistor may also have a similar burst noise and flicker noise, and the resistance mechanism which generates a discontinuity in the particle phaseRecently, also the degree of doping of the transistor. Two semiconductor devices produced by the shot noise of the semiconductor PN junction voltage across the barrier zone changes caused tiredThe charge accumulated in this region the number of changes, which show a capacitive effect. When the applied forward voltage rises, N and P areas of electronic devices in the depletion region of the holeMovement, is equivalent to charging the capacitor. When the forward voltage decreases, which in turn make the depletion region away from the electron and hole, the equivalent capacitor is discharged. When the applied reverseVoltage, the depletion region of the opposite variation. When Crankshaft Positioning Sensor flows through the potential barrier region, this change will cause flow through the potential barrier region small fluctuations generated by the current, thereby generatingRaw current noise. Its size and noise temperature, △ f is proportional to the bandwidth. 3 high-frequency thermal noise, thermal noise is due to internal electronic conductorGenerated by the random motion. The higher the temperature, the more intense electron motion. No internal electronic conductor Games in its internal rules the formation of many tinyCurrent fluctuations, because it is disorderly movement, so its average total current is zero, but it as a component (or as part of the circuit) is connected up, A circuit, its internal current will be enlarged to a noise source, especially in the high frequency band of the work circuit of high frequency noise particularly.