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Discrete-Time versus Continuous Time analysis of feedback system
Imagine a generic feedback system, where A is forward gain and F is feedback gain. I will now go over two cases where in i will analyse this system.1. Reference = 110, A=10, F=1In this case, it can be...
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What does this NMOS/PMOS connected to Vout do in this TIA (Trans-impedance...
I was trying to understand a TIA (Trans-impedance Amplifier) design by Behzad Razavi which I found here.But I don't get what the transistor marked below, which is connected to the Vout, does?I even...
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Analog Compensator Vs digital Compensator in Power electronics Converter
I was working on designing a feedback compensator for my buck converter. I decided to use the compensator circuit in the feedback and give its output to Arduino which gives the duty cycle as shown...
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How can I improve the feedback portion of my boost converter circuit?
I designed this boost converter to drive vacuum florescent displays, nixie tubes, and similar devices.It can drive a 10k Ohm load at 235V. I'm sure I can get away with larger loads as alot of the...
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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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Negative phase margin and misconception of the point of instability in...
PreludeConsider a canonical block diagram of a negative feedback loop with gain \$K\$, plant transfer function \$G(s)\$ and feedback transfer function \$H(s)\$: -Regardless of what functions K, G, and...
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Output Voltage Feedback Circuit interpretation
I see reference design of Texas Instruments PMP40766 Universal input, 500-W CC/CV e-Bike charger reference design , In the design I don't understand the reason of diodes at the feedback circuit I share...
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DSP VS FPGA for Power electronics Solar inverters
I need some help regarding the use of an FPGA or DSP for the control loop of the three-phase solar inverter. I want to implement a digital feedback system (as shown below) instead of analog and...
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Placing the feedback components close to the inverting input pin or output pin?
In closed-loop operation amplifiers design, should we place the feedback components close to the inverting input pin or output pin in our layout? and why?For example for this design:I put the feedback...
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NCP11187 - SMPS Design Issues
I have been working on a SMPS design using the NCP11187. It should output 24V DC nominal with a maximum ripple of no more than 100mV Pk-PK and be able to output up to 50 Watts. I have generally...
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Feedback of the amplifier
If I have this amplifier with series-series (Voltage mixing , current sampling) feedback- Re, I know that current Ie will be sampling current (output) but what will be the voltage mixing (input) in...
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Feedback of amplifier
Would just like to know, why on the first picture RE1 is "part" of the feedback and is RE3 not? Then on the second picture is RE part of the feedback as well? Is there any way generally how to say?Link...
View ArticleUnderstanding Voltage Regulation in Sine Wave Inverters with ADC Feedback...
I properly scaled down the sine wave output of the inverter using a differential op-amp and applied a DC offset to shift the negative portion.What is the best and most efficient method to correct the...
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feedback in switching voltage regulator
I need to design a switching voltage regulator, all parts work fine but I am having trouble figuring out the feedback, on the negative terminal of my comparator i have a triangular wave that cycles...
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The functionality of a driver circuit
I was requested to make a laser driver circuit for a course project. After some research, I found this circuit.Can someone explain how this circuit works? What is 1R (R5&R6)? Can it be replaced...
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How can I analyse this circuit with two port network here?
The following is a figure from 8.72 in Design of Analog CMOS Integrated Circuit, page 319:The author used Bode analysis in the textbook. I am wondering whether I can solve it with two port network...
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How can I break the feedback loop network and add loading effect
Here is the circuit schematic.Consider Loading effect in feedback and break the loop.Simplify the circuit.$$A_{v,open} = \frac{V_{out}}{V_{in}} = -\frac{g_{m1} R_F R_D} {R_S +R_F}$$Calculate \$\beta\$...
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TPS65131 inverting dc-dc overshoot
I am trying to make a ±12 V power supply with a TPS65131 DC-DC converter.The positive rail looks just fine, but the negative rail overshoots to around -12.7 V and then slowly recovers to -12 V, then...
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How can you tell whether it's either voltage-current or voltage- voltage...
The following circuits have different feedback.Resistor \$R_F\$ senses the output voltage and returns a proportional current to node \$V_X\$. Thus, the feedback can be considered as the voltage-current...
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Why does this simple op amp create an AM modulated envelope over its carrier?
The circuit below is an ideal op amp (requires no power, can produce any output voltage) in LTSpice:LTSpice shows it amplifying the 159.155 kHZ input, as expected. But it also shows a 2500 kHz AM...
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