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Posts by LvW‭

10 posts
71%
+3 −0
Q&A Purpose of emitter resistor in a common collector amplifier

In most cases, the common-collector stage (emitter follower) is used as a buffer stage (unity gain). It is, therefore, an independent stage, whose mode of operation should not be determined by the ...

posted 3y ago by LvW‭

Answer
71%
+3 −0
Q&A Why Ib=const. for BJT output characteristics Ic=f(Vce)

Introduction: In some books and other technical papers (also from universities) it is - surprisingly - still claimed that the bipolar transistor (BJT) would be a current-controlled element. This is...

4 answers  ·  posted 3y ago by LvW‭  ·  edited 8mo ago by Lorenzo Donati‭

Question transistor
71%
+3 −0
Q&A Using FET based followers and design rules

"Also, if there is a way to control this drop (without using an oamp), what are the design rules, or perhaps the rules of thumbs ?" "I reformulate this question:do you see any reason to use a FET ...

posted 3y ago by LvW‭  ·  edited 3y ago by LvW‭

Answer
66%
+4 −1
Q&A Help with differential to single ended voltage converter

Question: What is the purpose of the current mirror? Answer: It allows to combine the current changes in BOTH transistors (T1, T2). Explanation In a classical differential amplifier (with separat...

posted 2y ago by LvW‭  ·  edited 2y ago by LvW‭

Answer
66%
+2 −0
Q&A Design high -pass filter with 2 points of the bode plot

Miss Mulan - I am a bit late with my answer. Nevertheless - there is formula which gives you the necessary filter order "n" - as a function of two frequencies and both associated damping figures. ...

posted 1y ago by LvW‭  ·  edited 1y ago by LvW‭

Answer
60%
+1 −0
Q&A Why Ib=const. for BJT output characteristics Ic=f(Vce)

My Answer: There are only practical reasons for a representation with Ib=const. These characteristics are primarily used to determine the DC working point (Ic_o, Vce_o) - together with the working ...

posted 3y ago by LvW‭  ·  edited 3y ago by LvW‭

Answer
60%
+1 −0
Q&A Re model of transistor is the same in 2 different configuration

I never would recommend to use the "re model" for a BJT. The reason is as follows: The BJT is a voltage-controlled device (Ic is controlled by Vbe and the base current is an unwanted by-product...

posted 2y ago by LvW‭  ·  edited 2y ago by LvW‭

Answer
60%
+1 −0
Q&A Results of analysis of Hartley oscillator dont make sense

MissMulan - at first, you should show which nodes are connected (crossing points). Secondly, where are the voltages Vo and Vin in your diagram? Please keep in mind, that it is essential to OPEN t...

posted 1y ago by LvW‭  ·  edited 1y ago by LvW‭

Answer
50%
+1 −1
Q&A Find feedback of circuit

I must admit that your question (the described problem) is an interesting one. Speaking about the circuit (without consideration of the parts values), there are two feedback effects: At first, ...

posted 2y ago by LvW‭

Answer
42%
+1 −2
Q&A Usage of modern active building blocks [closed]

In the past, a large number of new active building blocks have been proposed and published by many researchers all over the world. In most cases, these new building blocks were used for realizing n...

0 answers  ·  posted 3y ago by LvW‭  ·  edited 3y ago by LvW‭

Question amplifier