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Analog circuit frequency response analysis with zero frequency

Hello. For instance, our transfer function follows as : H(s) = (1+s/Wz1)/(1+s/Wp1)(1+s/Wp2) When we get zero frequency in analog amplifier design, we assume that transfer function is equal to zero at zero frequency(because numerator will be zero) from that, we can get wz1, zero (...)

PIR D203S circuit op amp circuit doubt

I don't identify a transimpedance amplifier. There are two voltage amplifier stages, first non-inverting, second inverting. Both are incorporating high- and low-pass filter functions, or in terms of AC circuit analysis poles and zeros. R4/C4 represents a zero, R3/R4 + 1 sets the mid frequency (pass band) gain of the first (...)

What is the output impedance of a square wave switch-mode RF "amplifier"?

if it is an efficient source of power into that antenna, the output impedance of the switch mode amplifier therefore has to be 50 ohms, or whatever the antenna impedance it is tuned to work with is.

Pole zero doublets and gain boosted op-amps

The question can better understood with a schematic of cascaded amplifier topology.

Differential Power Amplifier

Hey, I was wondering how to design a differential PA, so basically you have two common source amplifiers which are connected to a transformer with a center tap. How do you do load pull on a differential pair to know the optimum load impedance for the transistor? Do you just use one single transistor instead? Once you have you optimal imped

circuit for extracting signal average

"go to an op-amp" and being "in the op-amp path" are different things. Rather mysterious how a low-pass in front of an amplifier should affect stability. May be you are not telling the full story? Averaging can be a achieved by low-passes or integrators, ín other words poles at low frequency or zero. Quite obvious, I think.

Using 2 potentiometer pins only for audio in?

Using only two pins on a potentiometer will not work as a volume control. 1) With 3 pins the pot is a voltage divider with signal control from zero to maximum. 2) The input resistance of the LM386 amplifier IC you show is 50k ohms. Using 2 pins of the pot the signal becomes divided to 50k/(10k + 50K)= 83% for the minimum to 100% for the maximum. Yo

Phase to amplitude converting in analog stage

Hi, Read about "lock in amplifier" (LIA). It is a solution to measure amplitude and phase angle (0..360°). The output is low pass filtered and therefore you may see it as DC. = easy to read with an ADC. You need at least two bipolar ADC inputs per channel. *** The XOR solution is easy. You need reliable zero cross signals from a clean sine wave.

High Side Current Monitoring Common Mode Voltage Range

If your high side voltage is above 2v then the ZXCT1009 chip will work fine. Unless your high side voltage falls below 2v and you still wish to monitor the current, than you will probability have another source to power the shunt amplifier available. Any op amp that has a common mode voltage reaching down to zero would be more appropriate.

Issues with Instrumentation Amplifier for Current Sensing

Hi, Does this mean that with NO input applied at sense resistor (R116), I would have a non-zero output voltage due to intrinsic characteristics of any opamp? It can not go exactely to the supply rails. If one supply rail is 0V than the output can never be exactely 0v. My opinion: This is no only for OPAMPs. This is the same for e

Could someone please let me understand the term "Zero Drift" in an amplifier ?

I would like to know exactly what is zero drift and what it does in the sensing device. mainly, what advantages in it by using zero drift architecture amplifiers? :bang: Thank you for your comments.

Three phase motor control in microc with PIC16F877A using TRIAC

Hello,I would like to control a three phase motor respecting phase order,could you advise on how I can do it,for zero crossing detection I used an operational amplifier as a comparator for detecting the zero crossing level,and I also I want to start from a low speed which could be increased with a push button,I planned to use the TRIAC (...)

OTA Design : DC gain 120dB, Sensor Applicaiton ( low speed and small BW)

Since I am such a beginner about designing amplifier, so I will gladly get some suggestion for my design. I want to design a high DC gain ( 120dB ~ 140dB ), and for sensor application amplifier OTA, with the supply is 3.3V. It is for humidity sensor, and sampling frequency is 1MS/s, so not high speed, that means, mostly the input is DC for the

Role of a resonator in oscillator

Same as a crystal (which is a specific sort of resonator). It passes a particular frequency and in a feedback loop with an active amplifier, creates oscillation. There is no such thing as pure DC. Always some noise to start the process, unless you're at absolute zero.

Operational Amplifier- Virtual short

Hi all, As virtual short exists in opamp (with -ve feedback,open loop gain=infinite), Is output of this opamp is always zero? And also why virtual short not valid in positive feedback? Thanks. "Virtual short" means that the incoming signal (non-inv. input) is nearly identical to the feedback signal (at the

Negative voltage for drain in class-E power amplifiers

Friends, I would like to design a class E power amplifier. As you know, voltage and current waves of the switch in negative peak must be zero, but in my circuit they have negative values. When voltage is negative, current is positive!So, in this condition the switch can work as a source of power and can produce power!!! Is it a mistake or it rea

Voltage amplifier model (excercise question from Sedra Smith 5th ed.)

Hi! I'm doing some exercises in Microelectronic Circuits (Sedra Smith 5th ed) and got stuck on 1.13 (voltage amplifiers) NOTE! This is not the end-chapter excercises included in the PDF solution manual! According to SedraSmith a voltage amplifier can be modeled as in the figure. 118885 The question is: "

Class E and Class F Amplifier

Hello guys, Can someone explain how class E and class F amplifiers work? I tried to look around the web, but I didn't understood. For example, in class F, the square waveform that we can obtain using the filter to get the fundamental (in parallel with the mosfet at the output) and a series LC tank circuit to get the 3rd harmonic, appears at t

What is the correct frequency to determine Phase Margin

At a frequency < GBW, my phase response dips to 40deg (LHP zero present). ... i.e. why would the 40deg frequency not cause more ringing? Right: If you set the amplifier's closed loop gain to that gain < GBW where you find this 40° PM dip, the amplifier will show more ringing around that frequency. [QUOTE=dia

mmic power amplifier design

hello i need to know mmic power amplifier design from zero to advance step by step using ads