TRANSCON - 2 X Cascode VAS plus 1 X Transconductance

Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.
This is an idea to mix two concepts. And the result is not to bad. But this Amp is definitely not for capacity load, then it tends to oscillate. A output filter is recommended.
Because of the last voltage amplification the amp can power up from rail to rail.
The simulated THD is about 0.000015% :)
 

Attachments

  • schem.jpg
    schem.jpg
    134.7 KB · Views: 206
  • bandw.jpg
    bandw.jpg
    154.7 KB · Views: 203
  • fft.jpg
    fft.jpg
    410.8 KB · Views: 176
Hi Pawel,

It's just a spontaneous idea, I will not further pursue this :)

At the time I am developing a module for an active Box. It should have:
-low Bias
-soft clipping
-short circuit protection
-rail to rail
-and, of course, acceptable performance

There must be an alternative to the LM ... and TDA ...
 
If you connect the LTP cascode reference voltage V1 to the current source (collector of Q2) rather than ground, I believe it will reduce the common-mode distortion produced in the non-inverting configuration by modulation of the C-E voltage of the input pair, despite their cascode.
 
Last edited:
Status
This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.