A9 Ratchet
PCB - top view
Loop gain analysis
A9 Ratchet
THD 1kHz
IMD 3kHz, 4kHz, 5kHz
THD plots
Square wave
Triangle wave
Sine wave
Clipping
Slewrate ~108V/us
Stability test
A9 IPS
This simple IPS board was inspired by mr Mile Slavkovic's amplifier called A9.
I have changed the VAS stage, gain, power supply, OP-amplifier and the compensation.
Overall performance is very good. The key feature in this design is the NFB network.
The feedback loop is splitted in between OP-amplifier and the inverting input of the front stage.
The inverting input of the OP-amplifier is AC-coupled so we can say it works as a ''DC-servo'' circuit.
