Wideband
Differential Amplifier Calculator
See our other Electronics
Calculators.
The wideband differential amplifier has high gain and high band
width. It overcomes the Miller capacitance limitations of the common
emitter amplifier by tying the collector of Q1, and the base of Q2 to
signal ground. As a result it can achieve gain bandwidths orders of
magnitude larger than the common emitter amplifiers. The only cost
is that a second transistor is needed.
This calculator computes bias voltage and current
levels, as well as gain and frequency response.
Equations
VB= VP*R2/(R1+R2)
VE= VB-VBE
IE=VE/RE
Alpha= Beta/(Beta+1);
IC= Alpha*IE
VC= VP - IC*RC/2
IB=IC/Beta
gm = Ic/25mA
re= Alpha/gm
rπ=
Beta/gm
A=Alpha* rπ*RC/(Rs+2*rπ)/re
fP1=1/(2*π*(Rs||2*rπ)*(CBE/2+CBC))
fP2=1/(2*π*RC*CBC)
fT=
gm/(2π*(CBE+CBC))
The lower pole is dominate:
Manufacturer Links
The best way to find electronic components is to use
our free Electronics
Component Directory, where a myriad of manufactures are
listed.
Other Electronics Links
We offer a broad range of electrical
engineering calculators and electronics
articles and tutorials.
Daycounter specializes in
contract electronics design. Do you need some help on your project?
Contact us to get a
quote.
[Employment]
[Downloads][Articles]
[Contact Us]
Call us now at
1.801.938.4264 - 502W. 9460S. Sandy, UT 84070
© Copyright 2004 Daycounter, Inc. All rights Reserved.
|
