"Eeyore" wrote in
message
Arny Krueger wrote:
When techniques like these are utilized, it is often
found that SS amplifiers have negligable crossover
distortion.
Pure nonsense. Crossover distortion remains the bete
noire of conventional Class AB bipolar designs.
Please explain that in the context of the performance of this power
amplifier:
http://www.pcavtech.com/pwramp/macrot-5000VZ/index.htm
For example,
http://www.pcavtech.com/pwramp/macro...ex.htm#DR_001S
represents the following test conditions.
(1) 1 KHz was applied to the amp, and levels were set so that 1 watt was
delivered to an 8 ohm resistive load. This corresponds to FS in the graphic.
(2) The dynamic range test signal was applied. This test signal is composed
of a 1 KHz tone at 60 dB below the signal used in step 1.
(3) The graphic shows a spectral analysis of the output of the power
amplifier, referenced to the signals observed in step (1). We see the
following:
(3a) 60 Hz hum with harmonics, none worse than about 95 dB below the 1 watt
in step (1).
(3b) The 1 KHz test tone, 60 dB below the 1 watt in step (1)
(3c) All harmonics 120 or more dB below the 1 watt in step (1).
Normally, crossover distortion produces a series of harmonics of the low
level test signal. The test signal was about 85 dB below the amp's full
rated power. There are simply no observable harmonics.
Is it possible to have crossover distortion that generates no harmonics of
such a low level test signal?