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Oscillation Frequency for RC Phase-Shift Oscillator Oscillation Frequency for RC Phase-Shift Oscillator ¶ In the pahse-shift oscillator the feedback circuit is three cascaded RC secrions. For simple design the capacitors and resistors in each section have the same value R and C. Fig. RC Phase-Shift Oscillator ¶ Calculate the Oscillation Frequency ¶ At each capacitor and resistor the currencies are $ \begin{aligned} i_1 &= j\omega C\,(v_1-v_a)\\ i_2 &= \cfrac{v_a}{R}\\ i_3 &= j\omega C\,(v_a-v_b)\\ i_4 &= \cfrac{v_b}{R}\\ i_5 &= j\omega C\,(v_b-v_2)\\ i_6 &= \cfrac{v_2}{R}\\ i_7 &= \cfrac{v_2}{R_i} \end{aligned} $ Kirchhoff's Current Law gives $ \begin{aligned} i_1 &= i_2+i_3\kern 2em&\dots(1)\\ i_3 &= i_4+i_5&\dots(2)\\ i_5 &= i_6+i_7&\dots(3)\\ \end{aligned} $ Eq.(1) becomes $ \begin{aligned} &j\omega C...