Analog Electronics: Circuits, Systems and Signal Processing by David Crecraft, Stephen Gergely

By David Crecraft, Stephen Gergely

The content material has been rigorously designed to fulfill the necessities of first and moment yr scholars of digital engineering, communications engineering and telecommunications, following complete honours measure courses or two-year classes together with HNC/HND.

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By David Crecraft, Stephen Gergely

The content material has been rigorously designed to fulfill the necessities of first and moment yr scholars of digital engineering, communications engineering and telecommunications, following complete honours measure courses or two-year classes together with HNC/HND.

Show description

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The circuit is connected to a generator of a step voltage having an output voltage of V shown here for simplicity as a battery and a switch Si. The switch is put in position A for a positive going step. 86) assuming that no current flows in the circuit at the start, when S\ goes to position A (/ = 0 at r = 0). 36(a). 87) ^=^('--"")=^<'-')=» A -O Li h'L t Fig. /. circuit. (a) (b) Fig. 36 The variation of the current and the voltages with time: (a) the current; (b) the voltages. Signals and signal processing 51 When the switch moves to position A (/ = 0), the current and therefore the voltage across the resistor are zero (/ = 0 and VR = 0).

The voltage across the resistor is always proportional to the current. 90). 2). The time scale of the process is governed by the exponent tR/L. The term L/R is a characteristic constant for a particular circuit. It is called the time constant it has the dimension of time and the symbol x. 35 from A to B has the result of setting the generator (supply) voltage from F to 0. Recall that VL = Z>^, so the current through the inductor, and therefore in the circuit, can only change slowly and not instantaneously.

11) In a continuously changing sine wave (j) changes continuously by In radians per cycle. Since this takes place / times per second the rate of change of cj) is called the angular velocity, or angular frequency, co. 13) where the m term represents the change of (j) since t = 0. The 9 term, called the phase angle, represents the fact that the sine wave may not have started at (|) = 0 when r = 0 in the particular scale of time used here. , at different times. 11 shows two sinusoids of different phases as an illustration.

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