函數(shù)信號發(fā)生器設(shè)計外文資料及翻譯(完整版)
【正文】 ions in transistor and circuit parameters, shall not fall below unity. While the first two principles stated above must be satisfied on purely theoretical grounds, we may add a third general principle dictated by practical considerations, .:In every practical oscillator the loop gain is slightly larger than unity, and the amplitude of the oscillations is limited by the onset lf nonlinearity. Root locus of the threepole transfer function in the splane. The poles without feedback () are ,and,whereas the poles after feedback is added are ,and .2. Triangle/square generation shows a function generator that simultaneously produces a linear triangular wave and a square wave using two opamps. Integratoris driven from the output ofwhere is wired as a voltage parator that’s driven from the output of via voltage divider . The squarewave output of switches alternately between positive and negative saturation levels.Suppose, initially, that the output of is positive, and that the output of has just switched to positive saturation. The inverting input of is at virtual ground, so a current equals. Becauseandare in series, and are equal. Yet, in order to maintain a constant current through a capacitor, the voltage across that capacitor must change linearly at a constant rate. A linear voltage ramp therefore appears across,causing the output ofto start to swing down luinearly at a rate of 1/volts per second. That output is fed via thedivider to the noninverting input of. Basic function generator for both triangular, and square waves.Consequently, the output ofswings linearly to a negative value until thejunction voltage falls to zero volts (ground), at which point enters a regenerative switching phase where its output abruptly goes to the negative saturation level. That reverses the inputs of and, sooutput starts to rise linearly until it reaches a positive value that causes the junction voltage to reach the zerovolt reference value, which initiates another switching action.The peaktopeak amplitude of the linear triangularwaveform is controll
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