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8 Threads found on 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 (...)
I'm looking for a low noise amplifier to amplify some uV signals from 300kHz-1Mhz. It's for an NMR application. My questions are: 1. What exactly is inside a low noise amplifier? 2. Is it just a few transistors in CE, cascode, etc topologies that have been "tweaked"? 3. Is it something that I could build on my own on a breadboard or
A cascode amplifier is shown . Given that VCC = 12V, RS = 50Ω, R1= 43kΩ, R2 = 15kΩ, R3 = 12kΩ, RC = 2.7kΩ, RE = 1.2kΩ, RL = 4.7kΩ, CB1 =10μF ,CB2 =CC2=4.7 and CE = 100 . Assume junction capacitance Cbe= 9pF, Cbc=3pF, thermal voltage VT =25.8mV, βac=150 and VBE=0.7V for both transistors (i) D
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