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Voltage regulation feedback loops
I have a few questions in my mind. I've searched alot but couldn't find a satisfactory answer. Kindly help me if anyone has knowledge about it. I am concerned regarding the feedback loops of the...
View ArticleIntuitive advice needed regarding PID controller for *centering* a Balanced...
I have built for myself an inverted pendulum balancer. It comprises a straight, horizontal metal track upon which rides a carriage which is driven by a stepper motor. The pendulum is mounted on the...
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UCC3895- VS UC3842-based SMPS designs
I have a slight confusion regarding the UCC3895, which is a four-channel wave generator. Earlier I had worked on the UC3842 and therefore to see better results I wanted to take a look at the UCC3895....
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How does an SMU change its output impedance from current source mode to...
The above three figures are from the Keithley 237 SMU service manual.From my understanding, the system is configured as a famous two OPAMP precision current-pump topology (shown here).Although I still...
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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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Problem with the current in a multiphase buck converter
I am a student of electrical and computer engineering and am currently working on a project that involves the study of a multiphase buck converter or synchronous buck converter (2 phases, in my...
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UCC3895 based power supply Confusion
I was working on the UCC 3895 IC in order to work on an SMPS design. I've seen the schematics of the IC and I could find any internal reference as done in some other PWM ICs like the UC3842 having that...
View ArticleRelationship between latency and sampling rate of a digital PID controller
I am trying to set up a fast digital PID controller. The error signal is read by an ADC and sent to an FPGA. The FPGA uses a PID equation to compute the integer sent to the DAC.At the moment I am...
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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...
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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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Making block diagram of an op-amp configuration
Hi everyone,I have to make the block diagram of the above configuration. Supposing the input capacitance of op-amp Cin, I've drawn this:A is the open loop transfer function of the OPA.B is the voltage...
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What is the definition of "the loading of feedback network on the...
There is the following example:simulate this circuit– Schematic created using CircuitLabIts loading of the feedback network on the input side is 40kohm in series. Its loading of feedback network on the...
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Why is the feedback of op-amp oscillators connected to inverting input...
I'm new to the subject of oscillators and learned that sustained sinusoidal oscillations are made possible by positive or regenerative feedback. Is that right? If that's true then I can't quite grasp...
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Feedback mechanism intuition
There is a circuit taken from the presentation below.Suppose at some point the VFM voltage rises from V0 to V0 + 0.01 V so V_minus of the op-amp rises too. So what causes the voltage on VFM to return...
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Is this LDO instability a real problem or a model bug? [closed]
Here is an LTSPICE simulation for which I just have an LDO (ADP7118) in its recommended environment and some reasonable parasitics. It is unstable as you can see in the transient plot (showing the LDO...
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Why will an ideal double integrator oscillator only oscillate at one frequency?
I am trying to learn about RF oscillators.Example 8.6 in the oscillator chapterof RF Microelectronics 2nd edition by Razavi asks to solve for the frequency and amplitude of the oscillation of an ideal...
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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 to add frequency control feedback loop to a circuit for an inductive heater
I am interested in a design made by an MIT student, Bayley Wang, several years ago for a 30kVA induction heater. One engineer on this site with professional expertise examined this circuit and...
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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...
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How do I explain this regulation action in terms of control theory?
Shown below is a current regulator circuit which ensures an almost constant current through R1 independent of Vin variations.There is no closed loop feedback system evident- How can we explain this...
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