The only infos that I got is my signal freq will be 8 - 45 Hz and need 20 M ohm preamp impedance. How do I determine the rest of the values, ie capacitance and resistors?
Hope someone could tell me what should I do 1st so that I could progress to next step.
2007-10-10 23:59:59 · 2 answers · asked by mis jekyll 2 in Science & Mathematics ➔ Engineering
I would go with a DC coupled design. That way you don't have to worry about the 'low' end of the AC spectrum, at all. A really good start would be a differential amplifier with, perhaps a darlington input to jack up the input impedance.
Do a search on "differential amplifiers" for more specific information.
DC - 45 Hz should be a "piece of cake" for any normal gain requirements.
.
2007-10-11 04:53:22 · answer #1 · answered by tlbs101 7 · 0⤊ 0⤋
First know the beta value of transistor/
then by using the kirchoff's voltage law , frame the eqn for input & output loop, then find the required resitances.
Use capacitors in the range of micro farads
2007-10-11 10:41:56 · answer #2 · answered by Anonymous · 0⤊ 0⤋