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How to get the feedback factor of this system?
If I want to get the feedback factor β of this system, do I need to consider the capacitor connected to ground or just 100k/(5k+400k+100k)?
View ArticleLFSR to generate a PRBS31 Test Pattern: Cannot figure out how to access the...
I am designing a simple white noise generator using four cascaded TI CD4014B 8-Stage Static Shift Registers and one TI CD4030B Quad Exclusive-Or Gate. Since I need the PRBS31 Test Pattern, the 31st and...
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current source with op-amp+NMOS
this is a closed loop feed back circuit in order to make a precise current source.my first question is about R23. haw much it should be? i think it isbetter to just mounted a 0R resistor and reduce the...
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MEMS Oscillator Simulation in LTSPICE
The MEMS oscillator topology i simulate is belowfig1: Oscillator schematicSource: A Tunable-Gain Transimpedance Amplifier for CMOS-MEMS Resonators CharacterizationBelow is mine, the resonator i am...
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How do I solve for the gain (MOSFET+Capacitor)?
So I came across this circuit in my analog electronics course. I am not sure on how to account for the capacitors and I couldn't find a similar circuit anywhere else. So how do I solve this circuit for...
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What is wrong with my simulation?
I am trying to design a isolated power supply with feedback control and I'm getting this error. I changed the initial timepoints and it did not simulate.
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How to Measure the Frequency Response of a Circuit with Current Feedback...
I want to use the Bode 100 Vector Network Analyzer to measure the frequency response of my circuit. I understand that with voltage feedback, a typical injection transformer can be used at the feedback...
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High-side current sensor causing feedback oscillations during overcurrent
I'm trying to design a circuit which uses an INA138 current sensor to shut off a load during overcurrent conditions (max current = 1A).However, when the current is over 1A I'm creating a feedback loop...
View ArticleHomemade EEG circuit common mode feedback
I am currently building a DIY EEG circuit using this guide. This guide is for when there are two inputs. How can I modify this so that I can also input two EMG signals too?It is common knowledge that...
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How to stabilise the BJT diff. pair feedback loop?
I need to remove the oscillation of feedback loop while fast response is maintained.I have no problem to avoid the oscillation if 47 nF cap is placed across output but since I want to feed the input...
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Stability analysis of cross-coupled amplifier in Cadence
I am trying to implement a cross coupled amplifier with OP-AMP feedback.I am not able to get it stable for a square wave however.The circuit looks as follows:The OP AMP is ideal from Cadence, all...
View ArticleHow do I determine \$R_o\$ for an op amp?
I understand that when driving a capacitive load with an op amp, the output resistance, \$R_o\$, of the op amp interacts with the load capacitor to form a low-pass filter, introducing a pole in the...
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Common-collector Colpitts oscillator - feedback analysis
I am a student working on a project where we are using CC Colpitts oscillators as local oscillators.We've chosen the above values based on the condition gm> w02C1C2RL,series, which for the given...
View ArticleHow to add feedback system for a CNC machine which drived by stepper motor?
I have an old CNC machine to retrofit. In this machines stepper motors without are used and those motor are not double shaft, so how can I make a feedback for this system if it is possible?
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How to calculate the current and voltages of this Sziklai pair?
Im new to Sziklai pairs and could not find any information on how to do calculations for this case. Im trying to do DC calculations and the info i have : +IN and -IN are for AC source, the +VE and -VE...
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Phase shift near saturation mitigation in input stage amplifier -- How does...
I'm trying to understand how this circuit works on the input stage to the 4192A Impedance Analyzer.Apologies for the quality... this is the best scan I could find. The design is furnished with the...
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Measuring flyback SMPS feedback loop response
I'm trying to measure the feedback loop on a isolated flyback SMPS. My goal is to determine the phase margin and 0 dB cross-over frequency.The most common circuit I have seen is the one recommended in...
View ArticleFeedback Circuit schematic to Control Theory block diagram?
I'm studying analog electronics circuit with feedback.I see that, during analysis, a useful abstraction over the schematic is the block diagram in control theory style, but I stuggle in deriving it...
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Non-standard injection point to measure loop stability of SMPS
I have come across this document https://www.ti.com/seclit/ml/slup386/slup386.pdf , where injection points for stability measurement are discussed in Fig.26.For point 3 it says: "Because the op amp...
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What is the recommended minimum DC gain for isolated switching power supplies?
I am studying one of Christophe Basso's excellent articles, where he describes the transfer function of the TL431 error amplifier in a Type II configuration (No Fast Lane configuration):$$|H(s)|=CTR...
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