LTspice tutorial 5: Simulation of Ring Oscillator using CMOS inverter

The odd number of inverters in the circuit forms a closed loop with positive feedback and this is known as a ring oscillator. The oscillation frequency is calculated using following equation Assuming that all inverters are identical and n is the number of inverters in the ring oscillator. The Delay is calculated using tphl+tplh= 0.7(Rn+Rp)(Cload) We will design the 11 stage ring oscillator and estimate the oscillation frequency using the LTspice tool. Cload= 5/2(1.25+0.625)fF= 4.7fF tpHL + tpLH = 0.7.(3.4k+3.4k)(4.7fF)= 22ps For an 11 stage ring oscillator, we get oscillation frequency of fosc= 1/11(.22ps)= 4.1 Ghz #cmosinverterbasedringoscillator #cmosinverterringoscillator #cmosringoscillator #cmosringoscillatordesign #cmosringoscillatordesigntutorial #cmosringoscillatorequation #cmosringoscillatorfrequencycalculation #cmosringoscillatoroutput #cmosringoscillator pspice #cmosringoscillatorhspice #cmosringoscillatorwithcombineddelaystages #cmosringoscillatoryoutube #howtocalculatefrequencyofringoscillator #aringoscillatorconsistingof11inverters #highfrequencyringoscillator #howtosimulateringoscillatorincadence #ltspiceringoscillator #oscillationfrequencyofringoscillator #pmosringoscillator #ringoscillatoranalog #ringoscillatoranalysis #ringoscillatorassignment #ringoscillatorcircuitltspice #ringoscillatordelaycalculation #ringoscillatordelaymeasurement #ringoscillatordesigntutorial #ringoscillatordiagram #ringoscillatorfrequency #ringoscillatorfrequencyequation #ringoscillatorinltspice #ringoscillatorltspice #ringoscillatortimingdiagram #ringoscillatortutorial #ringoscillatorusingcmosinverter