active element in amplifier being semiconductor device (H03B5/26 takes precedence)

Full Title

Generation of oscillations using amplifier with regenerative feedback from output to input (H03B9/00, H03B15/00 take precedence) > with frequency-determining element comprising resistance and either capacitance or inductance, e.g. phase-shift oscillator > active element in amplifier being semiconductor device (H03B5/26 takes precedence)