003_wein-bridge_oscillator : Wein-Bridge Oscillator
Requires: SmartSpice & Smartview
Minimum Versions: SMARTSPICE 4.6.5.R
The input deck is an Operational amplifier circuit with .AC and .MEASURE analysis. Rubberband R11[res],R12[res] and R10[res] parameters to change the gain and ".param R_TUNE_FREQ" and ".param C_TUNE_FREQ" to change the frequency response.
The stages in starting rubberband functionality is initially to get reference slider and reference waveform then vary the slider and get the new waveform vs the reference to see the change in output for the given slider value.
Input Files
rubberband_example_03.in
* OPAMP WIEN-BRIDGE OSCILATOR * Rubberband parameters: * R11[res], R12[res], R10[res] - gain, GAIN = (1 + (R11 + R12)/R10) * .param R_TUNE_FREQ, .param C_TUNE_FREQ - frequency, F0 = 1 /(2 * Pi * R_TUNE_FREQ * C_TUNE_FREQ) VTEST 40 0 AC 1 .PARAM R_TUNE_FREQ=10K .PARAM C_TUNE_FREQ=16NF R2 40 6 R_TUNE_FREQ C2 6 3 C_TUNE_FREQ R1 3 0 R_TUNE_FREQ C1 3 0 C_TUNE_FREQ * NON-INVERTING OPAMP R10 0 2 10K R11 2 5 18K XOP 3 2 4 OPAMP1 * AMPLITUDE STABILIZATION R12 5 4 5K *D1 5 4 D1N914 *D2 4 5 D1N914 * .model D1N914 D(Is=0.1p Rs=16 CJO=2p Tt=12n Bv=100 Ibv=0.1p) * * OPAMP MACRO MODEL, SINGLE-POLE * connections: non-inverting input * | inverting input * | | output * | | | .SUBCKT OPAMP1 1 2 6 * INPUT IMPEDANCE RIN 1 2 10MEG * DC GAIN (100K) AND POLE 1 (100HZ) EGAIN 3 0 1 2 100K RP1 3 4 1K CP1 4 0 1.5915UF * OUTPUT BUFFER AND RESISTANCE EBUFFER 5 0 4 0 1 ROUT 5 6 10 .ENDS * * ANALYSIS .AC DEC 10 10 10MEG .SAVE AC VM(4) VM(3) VP(3) V(3) .MEASURE AC MAX_GAIN MAX VM(4) .MEASURE AC FREQ_AT_MAX_GAIN AMAX VM(4) .END
Graphics
