The number of stages will be determined by the amount of phase shift at the output of each stage.Hi
Im stuck on the question below.
design a phase shift oscillator which gives two outputs at 120 degrees to each.
Im confused as to how many RC stages are required and why?
I gotta point out that not all amplifiers invert the signal.There is a built in assumption though. The amplifier stage inverts the signal 180°. With BJT amplifiers this is a common configuration, as well as with vacuum tubes and other types of transistor amplifiers.
I suspect this is a Wien Bridge, in the absence of a schematic.What worked for me at the first try, was a "twin T" oscillator using a TL072 opamp.
Used two 1N4148 diodes to control amplitude and seemed to have very little distortion even if assembled in a protoboard.
You can use an ordinary 3-stage oscillator. The signal across each stage is 60 degrees away from the ones either side, so you can tap off the signals from the 1st and 3rd stages (with high impedance buffers) to get two signal 120 degrees apart, albeit with different amplitudes.Hi
Im stuck on the question below.
design a phase shift oscillator which gives two outputs at 120 degrees to each.
Im confused as to how many rc stages are required and why?