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A3. (a) Explain the principle of operation of a phase shift oscillator. Explain the condition needed for sustained oscillations and how the amplitude may be stabilised [8 marks] (b) Design a phase shift oscillator using a three-section RC network using 10 ko resistors and 100 nF capacitors. Calculate the frequency of oscillation [9 marks] (c) The gain and phase of the three-section RC network are shown in Figure A3c. If the operational amplifier used to complete the circuit in part (b) is found to have a phase shift of -10° around the designed frequency of oscillation, explain how this will affect the operation of the circuit NI ELVISmx Bode Analyzer XLV LabVIEW Mosurement Settings Semua Resporas Channel AD A Connections: AIO-FGEN AT 1-Signal -200- -100 Start 50.00! Stop 300.00 1-500 Stre -500 Peskode 1.00 Op Ame Soral Polarity mal 300 100 Frequency (E) 2000 Graph Settings Mapping Logarithmi 1500 Autoscale 100.0 500 - Cursor Settings Cursors on Curver Position 00 Right -500 -1000 - 150.0 fratrument Control Dec Sim NO Run Shop Print 100 Hello Frequency (H) 0:00 Real Data Frequency (2) Phase deo) 0:00 Gan 0.00 Simulated Data Gan (dB) Inf Figure A3C [8 marks]