Question 13.7: FINDING THE TRANSIENT RESPONSE OF AN AVERAGING CIRCUIT An in...
FINDING THE TRANSIENT RESPONSE OF AN AVERAGING CIRCUIT
An input signal is to be averaged and then fed to a load resistance R_{L} = 1 GΩ. This is shown in Figure 13.27(a). The input signal is a triangular wave, as shown in Figure 13.27(b). Use PSpice to plot the transient response of input and output voltages for a duration of 0 to 33.33 msec in steps of 10 μsec.
The averaging is accomplished by the RC circuit of Figure 13.27(c). This is similar to Example 13.6, except that the value is divided by time. The input frequency is f = 1 kHz.
The PSpice schematic is shown in Figure 13.28(a) with an averaging circuit. Figure 13.28(b) shows an implementation with an ABM integrator.
The listing of the circuit file is as follows:
Example 13.7 Averaging circuit
| SOURCE VIN 1 0 PULSE (0 1V 0 0.5MS 0.5MS 1NS 1MS) CIRCUIT RL 2 0 1G * Calling subcircuit AVRG: * Subcircuit definition for AVRG: ANALYSIS .TRAN 10US 4MS UIC ; Use initial condition in transient analysis .END |
The plots of the transient response for the input and output voltages are shown in Figure 13.29. Under steady-state conditions, the average value of a triangular wave remains constant at 0.5bh/T = 0.5 × 1 msec × 1 V/1 msec = 0.5 V.
