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8 Threads found on edaboard.com: Cascode Frequency Response
Consider that the absolute output range, and the useful output range will certainly differ. Once you start to bury the cascode devices, your Rout and your gain will drop big-time (as well as your frequency response into any significant output capacitance, change markedly). The matching of load and compensation to output capability and (...)
PM = 180°-arctan(ft/fdp)-arctan(ft/fndp1)-arctan(ft/fndp2) ft --> unity gain frequency fdp --> dominant pole frequency (cut-off/-3dB freq. of your opamp) fndp1 --> non-dominant pole 1 freq. fndp2 --> non-dominant pole 2 freq. dp1 is much smaller than ft so try to move the ndp1 lot of times further than ft to improve phase margin. In a classical
frnds we all know that gain boosting technique enhances the gain without affecting the frequency response.But gain boosting gives rise to two doublets one due to each auxiliary amplifier.Thier frequency also affects the settling time....... also fast doublets will not affect the performance much if proper design is made according to (...)
Dear Bartona Hi You can use AD620 or some other of products of Analog device company. In first stage of those amplifiers is a differential amp with low noise Fets or mosfets with Zi approximation = very high(open circuit) . yes cascode has a good frequency response but it is large and hardly ever used in integrated circuits.(because that (...)
Added after 5 minutes:
Usually for AC analysis, You need to scale your X-axis with log scale instead of a linear scale, then you'll see the curve as you described. Folded cascode will have high output resistance, so the dominant pole will be at very low frequency as several kHz, and your scale is Meg Hz/div, then the low frequency response stucked (...)
Hi, I am designing a bandgap reference as shown below and I am measuring the loop gain of the circuit of (Vob-Voa)/(Via-Vib). By changing the size of the cascode transistor that is circled, I could get two different frequency response of the loop gain. The graph on the left is obtained when the cascode transistor is small. (...)
cascode with high current