Hi-
I believe there are a few problems with page /vol_3/chpt_4/8.html, "The Cascode Amplifier".
First, in a figure in the middle of the page (03502.png) depicting two schematics, one labeled "Cascode" and the one next to it on the right labeled "Common-base". That schematic on the right should be labeled "Common emitter" instead, and the title for that figure relabeled appropriately.
After that things get a little confusing. The following graph shows two plots, one for the cascode and one for the common-emitter. The SPICE code that follows has no statements for plots for either one. The text says that code is for "printing AC input and output voltages", but contains no print statements.
Also, it is confusing to show two different schematic diagrams drawn seperately for "comparison", but then state that they share a voltage source ("The AC source V3 drives both amplifiers via node 4") and give SPICE code that includes both. Hmmm... why not draw the schematic as one complete unit? Or present SPICE code for each schematic separately? Imho, it's confusing as is. The only thing I can think is that it has been done that way to conserve space and possibly some redundacy, but I feel it is done at the expense of clarity.
Then, the hyperlink at the end of this sentence:
"The bias resistors for this circuit are calculated in an example problem cascode."
points to itself, not to some separate example showing calculations.
Hope this is helpful.
Keith Ostertag
I believe there are a few problems with page /vol_3/chpt_4/8.html, "The Cascode Amplifier".
First, in a figure in the middle of the page (03502.png) depicting two schematics, one labeled "Cascode" and the one next to it on the right labeled "Common-base". That schematic on the right should be labeled "Common emitter" instead, and the title for that figure relabeled appropriately.
After that things get a little confusing. The following graph shows two plots, one for the cascode and one for the common-emitter. The SPICE code that follows has no statements for plots for either one. The text says that code is for "printing AC input and output voltages", but contains no print statements.
Also, it is confusing to show two different schematic diagrams drawn seperately for "comparison", but then state that they share a voltage source ("The AC source V3 drives both amplifiers via node 4") and give SPICE code that includes both. Hmmm... why not draw the schematic as one complete unit? Or present SPICE code for each schematic separately? Imho, it's confusing as is. The only thing I can think is that it has been done that way to conserve space and possibly some redundacy, but I feel it is done at the expense of clarity.
Then, the hyperlink at the end of this sentence:
"The bias resistors for this circuit are calculated in an example problem cascode."
points to itself, not to some separate example showing calculations.
Hope this is helpful.
Keith Ostertag