Public info about the author: Cribald

Electronics engineer graduated at Università Politecnica delle Marche in Ancona. Experience in software and hardware designing. PSpice user since the days of university studies.
  • A full course using PSpice as SPICE simulator for a practical and easy way to learn 3-stage audio power amplifiers design with theory and SPICE simulation analysis. You ‘ll learn to calculate and size components of a basic three stage power amplifier. The sources current circuits of the first stage, study the effects of a feedback signal application, the mirroring of the first stage currents, design of a typical dual rail power supply for a fixed power, features of enhanced output stages with a current limiter, a zobel network filter, Nyquist Criterion to validate the stability of the amplifier with a feedback applied. The course explains how to implement frequency compensation with one or two dominant poles with compensation capacitors, design of top quality BJT 100W quasi complementary class B, 100W complementary class B, 140W class B, 40W class A.

    • 3 stages base schematic dual power supply 100W complementary class B 100W quasicomplementary class B class A 40W amplifier class B 140W amplifier dual power supply rectified global view simulation of dual power supplay gain phase bode plot without compensation gain phase bode plot after compensation phase out of stability region 70 degrees phase margin
  • SPICE simulation of a very high quality BJTs power amplifier in class A. Three stages, class A amplifier, double simmetrical differential couple with current mirrors. Sources currents with automatic control of the constant current amplitude. Feedback circuit and couple of compensation capacitors for every differential couple of the first stage. Darlington and cascode configuration transistors in the intermediate stage. Complementary parallel final transistors in emitter follower configuration, and SOAR circuit with double slope limiter circuit.

    • mirror effect on bjt emitters currents class A quiescent final bjt currents final BJT currents input output waveforms Gain versus frequency
  • SPICE simulation of a an active low pass filter in voltage follower configuration. How sizing the component values to set the cutoff frequency.

    • low pass filter response with unitary gain
  • SPICE simulation of an active high pass filter with LF353 operational amplifier. How to size the component values to fix the cutoff frequency.

    • high pass filter response with unitary gain
  • SPICE simulation of a square wave generator implemented with an operational amplifier. After choosing the components values to fix the oscillation frequency, it ‘s possible to adjust the duty cycle by a trimmer.

    • high and low duty cycles several duty cycles FFT waveforms