Jan:
Couldn't you use a cascode if the Vce is too big.
When you use currents there might actually be a gain in it.
Set the base at a fixed voltage and the emitter towards the mirror, gives the mirror less Vce voltage swing to work against as well.
I am not too good at this but it seemed to work in my iv stage although i didn't get any gain in using it, no Vce problem.
/Hjelm
Couldn't you use a cascode if the Vce is too big.
When you use currents there might actually be a gain in it.
Set the base at a fixed voltage and the emitter towards the mirror, gives the mirror less Vce voltage swing to work against as well.
I am not too good at this but it seemed to work in my iv stage although i didn't get any gain in using it, no Vce problem.
/Hjelm
don't dismiss emitter degeneration without looking at some #
roughly the improvement in matching, linearity, output z is porportional to the amount of local feedback
~= V(Rdegen)/26mV
so even a few hundred mV arcoss the degeneration Rs could improve things to a useful extent with a low voltage burden - certainly much less than 600mV
roughly the improvement in matching, linearity, output z is porportional to the amount of local feedback
~= V(Rdegen)/26mV
so even a few hundred mV arcoss the degeneration Rs could improve things to a useful extent with a low voltage burden - certainly much less than 600mV
http://www.analog.com/UploadedFiles/Data_Sheets/23265255MAT03_c.pdf
http://www.analog.com/UploadedFiles/Data_Sheets/196449167SSM2220_b.pdf
Please note that SSM2220 comes in SO08 finally! and also to a decent price.
Check at the end of the datasheets.
http://www.analog.com/UploadedFiles/Data_Sheets/196449167SSM2220_b.pdf
Please note that SSM2220 comes in SO08 finally! and also to a decent price.
Check at the end of the datasheets.
- Status
- This old topic is closed. If you want to reopen this topic, contact a moderator using the "Report Post" button.