Oscillators 1

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Oscillators 1. Design a phase shift oscillator based on the figure below. The circuit is to produce a 1kHz output frequency. Use 741 op-amps with a +10V supply Inverting R2 amplifier WW o+V cc R Output voltage VEE Feedback voltage Phase shift network = Figure 16-1 A phase shift oscillator consists of an inverting amplifier and an RC phase shift- ing feedback network. The RC network attenuates the output and phase-shifts it by 180. The amplifier amplifies the network output and phase-shifts it through a further 180. 2. Design the phase shift oscillator with amplitude control as shown in the figure below: The circuit is to produce 5kHz, +5V output waveform R2 Figure 16-13 Amplitude-controlled phase RX R6 RX shift oscillator circuit for Example 16-5. D D2 Q+V cc 0-VEE

3. Refer to the figure below. Design a triangular wave generator to produce a 13 V, 500Hz output. Use 741 op- amps with a +9V supply Schmitt trigger circuit Integrator R3 Q+Vcc o+ Vcc R1 -VEE O- VEE Integrator +V. - UTP output -Vo - -- - LTP + Volsat) - Schmitt output -V o(sat) - Figure 16-24 Triangular waveform generator consisting of a non-inverting Schmitt trigger circuit and an integrator. The Schmitt output is the integrator input, and the integrator output is applied as the Schmitt input. 4. The circuit below shows a Wienbridge oscillator. Design the circuit to produce 100kHz, 19V output with a closed loop gain of 3 Feedback Non-inverting I network amplifier o+Vcc Output R1 Vo voltage + R3 -VEE Feedback of voltage R2 RA Figure 16-10 The Wein bridge oscillator circuit uses an operational amplifier and a Wein bridge that balances at a particular frequency.