弄清电路中地噪声产生的机理是减少这种噪声的首要关键。对于既有模拟信号又有数字信号的混合电路的系统的噪声,Avid Technology公司的Morty Tarr作了如下表述: 当流过地的“地电流”发生变化时,这个“地”就会产生噪声。在数字电路中,当信号的状态发生突变和信号在时钟的边沿时都会产生一个突变的尖峰电流;类似的,在模拟电路中,当负载电流发生变化或摆动时,也会产生一个突变的尖峰电流。这些变化的电流流过跨接在地回路的阻抗上时,就会在这个局 Understanding the mechanism of noise generation in the circuit is the primary key to reducing this noise. For system noise in hybrid circuits that have both analog and digital signals, Morty Tarr of Avid Technology makes the following statement: This “ground” produces noise when the “ground current” flowing through it changes. In a digital circuit, a sudden spike occurs when the state of a signal is abruptly changed and the signal is at the edge of the clock. Similarly, in analog circuits, a sharp spike occurs when the load current changes or swings Current. These varying currents flow through the impedance that bridges the ground return and will be at this station