AMPII with VAS Update
Measurements on Prototype on 2010-06-30
Shematic (PDF)
THD+N vs.Level
THD+N vs. frequency
SMPTE & Noise
Static measurements:
IDiff:
1.40V @ 240
Ohms = 5.8mA
IVas:
1.40V @ 120 Ohms =
11.6mA
Change in VLED: 1mV per 5V change in Vcc (Vcc>25V)
0.01% per Volt Vcc
Bias current:
23-26mV @ Re
THD+N vs. Level
THD+N vs. Level @ 1khz, v=12 @ 4.8 Ohms, B=80kHz (dB)
THD+N vs. Level @ 1khz, v=12 @ 4.8 Ohms, B=80kHz (%)
THD+N vs. Level @ 10khz, v=12 @ 4.8 Ohms, B=80kHz (dB)
THD+N vs. Level @ 10khz, v=12 @ 4.8 Ohms, B=80kHz (%)
THD+N vs. freq. (30W)
THD+N vs. freq @ 1V, v=12 @ 4.8 Ohms, B=80kHz (dB)
THD+N vs. freq @ 1V, v=12 @ 4.8 Ohms, B=80kHz (%)
SMPTE & Noise
SMPTE 4:1, 4.8Ohms, v=12
Noise (Ref = 24Vrms out), Input = short