Talk:Common base

message: Could someone (preferably the author) pleas ex[plain this satment before it is deleted
.... VHF and UHF amplifiers where the fact that the output circuit only passes through a single PN junction rather than the two junctions of a common emitter amplifier gives a crucial advantage.
It actually passes through two junctions according to the diagram.
Light current 22:50, 6 August 2005 (UTC)
replies: text: Relax, please.  Maybe you should read through WP:AGF? - Omegatron 14:16, August 7, 2005 (UTC)
Moved this here cos it is really is not correct and should not be on a live page
where the fact that the output circuit only passes through a single PN junction rather than the two junctions of a common emitter amplifier gives a crucial advantage. (which is...?)''''
Light current 23:42, 7 August 2005 (UTC)
thread_title: Untitled

message: how does R1,R2 appear in the expression for R_in? they are shorted in small signal by C_b. 84.95.124.141 11:11, 20 February 2007 (UTC)
thread_title:  R_in 

message: There appears to be a contradiction in this article.
firstly:
Applications[edit]This arrangement is not very common in low-frequency circuits, where it is usually employed for amplifiers that require an unusually low input impedance, for example to act as a preamplifier for moving-coil microphones. However, it is popular in high-frequency amplifiers, for example for VHF and UHF, because its input capacitance does not suffer from the Miller effect, which degrades the bandwidth of the common-emitter configuration, and because of the relatively high isolation between the input and output. This high isolation means that there is little feedback from the output back to the input, leading to high stability.
This configuration is also useful as a current buffer since it has a current gain of approximately unity (see formulas below). Often a common base is used in this manner, preceded by a common-emitter stage. The combination of these two form the ***cascade*** configuration, which possesses several of the benefits of each configuration, such as high input impedance and isolation.
"a common base is used in this manner, preceded by a common-emitter stage. The combination of these two form the ***cascade*** configuration"
then later:
Overview of characteristics[edit]Several example applications are described in detail below. A brief overview follows.
The amplifier input impedance Rin looking into the emitter node is very low, given approximately by
,
where VT is the thermal voltage and IE is the DC emitter current.
For example, for VT = 26 mV and IE = 10 mA, rather typical values, Rin = 2.6 Ω. If IE is reduced to increase Rin, there are other consequences like lower transconductance, higher output resistance and lower β that also must be considered. A practical solution to this low-input-impedance problem is to place a common-emitter stage at the input to form a ***cascode*** amplifier.
"A practical solution to this low-input-impedance problem is to place a common-emitter stage at the input to form a ***cascode*** amplifier"
I looked up cascade and cascode in Wikipedia:
cascade = common collector -> common base
cascode = common emitter -> common base
So there is a problem in the first cited definition of cascade in this article.
Im no expert, so its unclear to me what is needed. I have made no changes to the article.
143.92.1.33 (talk) 00:38, 23 July 2013 (UTC)
replies: text: I took care of it by reverting the latest edit.  Dicklyon (talk) 03:43, 23 July 2013 (UTC)
thread_title:  Contradiction? 

message: I added a simple explanation: so college level readers have a starting point  — Preceding unsigned comment added by Grahamatwp (talk • contribs) 12:22, 24 May 2014 (UTC)
replies: text: I doubt that would be any real help to a college student.  Your claim that "As current is sunk from the emitter this provides potential difference so causing the transistor to conduct" was initially completely unreferenced.  You have now provided a cite to http://hyperphysics.phy-astr.gsu.edu/hbase/electronic/npncb.html#c1 but that page does not make any statement even remotely like that. SpinningSpark 12:33, 24 May 2014 (UTC)
replies: text: If you have issue with the wording used, then I suggest you improve it. Reverting changes without discussion will not improve the article. I was going for a Faraday description.  — Preceding unsigned comment added by Grahamatwp (talk • contribs) 12:58, 24 May 2014 (UTC)
replies: text: It cannot be improved. It needs discarding and starting again. SpinningSpark 16:47, 24 May 2014 (UTC)
replies: text:  You are being unhelpful. If you can see errors in the text you need to bring these into the discussion. If you feel it's completely wrong, then propose an alternative.  — Preceding unsigned comment added by Grahamatwp (talk • contribs) 17:07, 24 May 2014 (UTC)
thread_title:  Simplification is required 

message: The article is bound in mathematics, and is unclear I hesitate to say to the majority of readers. I would like to see the 
term large explained for instance, as large can be large in resistance , or large in current which are opposite of each other.
just saying something is large without informing if it is large resistance, or large current explains very little. 
Could I suggest a schematic be added showing stated voltage, stated value of RC in ohms and approximate voltage gain. 
The video here is I think far more informative and lets readers know how the circuit works; https://www.youtube.com/watch?v=dKutxThPvwY  
Underwaterlunch (talk) 08:59, 11 March 2015 (UTC)
thread_title:  Explain the term large ?