Complementary med pwr transistors? - Page 3

hjelm · 14th June 2004, 01:34 PM

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

jcx · 16th June 2004, 12:15 AM

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

peranders · 16th June 2004, 08:18 AM

http://www.analog.com/UploadedFiles/...255MAT03_c.pdf
http://www.analog.com/UploadedFiles/...7SSM2220_b.pdf

Please note that SSM2220 comes in SO08

finally! and also to a decent price.

Check at the end of the datasheets.

14th June 2004, 01:34 PM	#21
hjelm diyAudio Member Join Date: Nov 2003 Location: Västerås	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 __________________ Hjelm

16th June 2004, 08:18 AM	#23
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	http://www.analog.com/UploadedFiles/...255MAT03_c.pdf http://www.analog.com/UploadedFiles/...7SSM2220_b.pdf Please note that SSM2220 comes in SO08 finally! and also to a decent price. Check at the end of the datasheets. __________________ /Per-Anders (my first name) or P-A as my friends call me

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16th June 2004, 12:15 AM	#22
jcx diyAudio Member Join Date: Feb 2003 Location: ..	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

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