# Questions tagged [precision-rectifier]

A precision rectifier allows to rectify small input voltages, which are lower than a forward voltage drop of a diode.

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### Analysis of the below op-amp circuit and its waveform

What will be the output voltage and capacitor voltage waveform for this problem? [The approach I tried --> When the diode is ON, the negative feedback is complete and voltage of inverting terminal ...
66 views

### How to smooth DC output from an op-amp precision full wave rectifier?

I am using the circuit below to rectify the AC voltage from a current sensing transformer. It is a single supply full wave rectifier, which I intend to use to measure this voltage with a ...
66 views

### Precision Rectifier Breadboard Filters Out DC Offset Unexpectedly

I have a design for a precision rectifier that isn't working as I would like it to on a breadboard. I've attached the schematic below (VF1/VF2 are metering nodes). It is being fed by a preamplifier (...
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### Why is this precision rectifier circuit not producing a perfect output?

Can someone explain to me why this precision rectifier circuit isn't fully rectifying the signal? It seems to work well until the crest of the non-inverted sine wave signal. I've been trying to ...
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1 vote
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### Is this a valid way to determine which diodes are on in an op-amp based rectifier?

Consider the circuit above, where we are treating the diodes as ideal. Let's take the case where Vs < 0. Since V- = V+ = 0 for both U8 and U9, that automatically means the current is to the left ...
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### Fullwave rectifier with active clamp

What is wrong with my simulation? I am simulating with LTspice the following circuit taken from "Art of Electronics 3ed" where my LTspice model looks as follows: What am I doing wrong as ...
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1k views

### Seeking circuit of precision rectifier (or absolute-value) with "high bandwidth"

I need to detect (convert to DC, or low frequency <1kHz) the amplitude of a signal. The signal at full-scale is quite large, being a 1MHz sine-wave, with zero-offset and peak-to-peak amplitude of ...
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### Why I'm getting different values than the simulator in precision half-wave rectifier?

I've build this circuit on the breadboard and with 5V AC I'm getting 2.5V at the output: simulate this circuit – Schematic created using CircuitLab The problem is in the simulator it outputs 1....
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### Op Amp Precision Rectifier Question

I'm struggling a bit with op amps again! I'm trying to learn how to use an inverting precision amplifier, and I'm getting very confused about the operation of the op amp in a active rectifier ...
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### Peak detector circuit for AC RMS value

The peak detector circuit based on a precision rectifier with buffer allows to obtain the peak value. The RMS value in an AC circuit is obtained from: RMS = V peak / sqrt (2) = V peak * 0.7071 AC ...
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### How does this rectifier work, since the op-amp input is 0 V?

Consider the rectifier below. Both inputs for the op-amp are 0 V. There are two diodes, that only allow current if the potential difference over them is above 0.7 V. Also, V1 is a sinusoid. I don't ...
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### Full-wave precision rectifier - Noise on the output only on the rectified part

I have a simple full-wave precision rectifier made of two op-amps integrated into the OPA2810. The gain of the full-wave precision rectifier is 1. The circuit is the following: The positive supply is ...
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### How to improve this precision rectifier by further decreasing cross-over transition times?

The Circuit The rectifier comes from TI's TIDU030: Precision Full-Wave Rectifier, Dual-Supply application note. My "benchmark" used as a baseline for evaluation is as shown below, powered ...
511 views

### How to add gain to this op-amp based precision full wave rectifier?

The design for the rectifier is rather clever, and comes from TI's TIDU030: Precision Full-Wave Rectifier, Dual-Supply. It looks as follows: simulate this circuit – Schematic created using ...
286 views

### Voltage follower output half wave signal; how can I reduce the ringing on the output?

I have used a voltage follower with a TSH082. I was able to get a half-wave signal with some slight ringing on the output (shown below). Is there a way to reduce the ringing on the half-wave signal ...
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### Half wave rectifier query

This is an ASK asynchronous demodulator In the circuit, we can see 3 differentiated parts: One half-wave rectifier, one envelop detector and a comparator. The circuit receives SIG which is a ASK ...
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### Voltage Follower vs Half Wave Rectifier

So I used a voltage follower with an input of a sine wave signal (positive and negative cycle) . The output was half wave signal which is what I wanted. Why do people use half wave precision rectifier ...
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555 views

### My precision full wave rectifier is only outputting half wave; not sure why

I am currently using a precision full wave rectifier as shown below. The issue I have is that the output look like a half wave signal. Images of the input and output signal of the circuit is shown ...
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### Which is the input resistance of the second amplifier?

If a apply a positive Vs, then D2 is blocked and D1 is working, right? How do I calculate Vo then? I know the formula is: - (input resistance / negative feedback resistor) * Vs, but I don't know which ...
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### Understanding the precision rectifier

In particular, I was trying to understand the behavior of this precision rectifier given an input wave $V_{in}=V_{o}sin(\omega t)$. To my understanding, the circuit reduces to what we have in the ...
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1 vote
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### Understanding how the simple precision rectifier works

I'm specifically talking about this: If I try to graph $V_{out}$ , considering that I'm supplying $V_oSin\left(\omega t\right)$: I would start by assuming that the diode is reversely biased, ...
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1 vote
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### Is there a current in $R_1$ in this precision rectifier if so, where does it go?

So Wikipedia on Precision Rectifier says that : ... when the input is greater than zero, $D1$ is off, and $D2$ is on, so the output is zero because the other end of ${\displaystyle R_{2}}$ is ...
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### Peak detector and amplifier for electret microphone

I've designed a circuit for detecting peak levels of a electret microphone. I've tested the circuit before manufacturing 100 units and it worked nice. After testing the 100 PCB I've received, only 32 ...
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### Confusion in precision rectifier

I just started reading about operational amplifier from the book Fundamentals of Microelectronics by Behzad Razavi. I want a to get a better understanding of precision amplifiers and their design. The ...
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### Precision half-wave rectifier / peak detector oscillation on positive cycle

I am having trouble building this precision half-wave rectifier to use to detect an AC peak on a real PCB: The "real" circuit uses an LM318 opamp, but in LTspice the LM308 appears to ...
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### Precision rectifier doesn't give expected output

I'm currently designing a precision rectifier. I have a current sensor that outputs a current (AC) of 0.3mA to 32mA for 0-100A across a resistor of 510 ohms. As the value of the voltage will be around ...
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### What is the difference between a diode rectifier and an op-amp precision diode?

What is the difference between a diode rectifier and an op-amp diode (precision) rectifier? What is the need for an op-amp in the second case? Thanks for the easy explanation.
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### Double wave precision rectifier frequency response

To perform a didactic experience, I had to design a double wave rectifier by using op-amps (TL081). I choose to use two stages: a single wave precision rectifier (i.e. ideal diode) and an inverting ...
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2k views

### Full wave rectification by opamp

I am trying to read a current waveform from a shunt resistor series with the power line. Using a full bridge rectifier, I got the following waveform: The waveform was sampled every 2 millisecond ...
1 vote
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### Precision Full-Wave Peak Detector component values

so, I am a beginner in electronics...hoping to find some help... here I've found a circuit that I want to use from LM 3915 datasheet..... but the problem is I don't have 0.2 and 0.47 Capacitors... ...
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### Precision Rectifier confusion

Its been a while I took a long hiatus due to not having a scope any longer, but I finally saved up and got myself one. I was playing around with a precision rectifier (OPA350PA) and I came across ...
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### Why is the output of the precision rectifier 0 when the diode does not conduct?

From Wikipedia: "When the input voltage is negative, there is a negative voltage on the diode, so it works like an open circuit, no current flows through the load, and the output voltage is zero." ...
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### "gain error" of rectifier circuit

I did some soldering and breadboarding and implemented the precision rectifier circuit as presented in which was taken from an Burr-Brown Application note sboa068. R1, R2 and R3 are all 10k, the ...
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1 vote
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### Precision absolute value circuits

I see several options for this; there is the TI's application bulletin (originally a Burr Brown App. Bull. from 1997) --- www.ti.com/lit/an/sboa068/sboa068.pdf There's LT's LT1001-based circuit: http:...
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### AC Signal Conditioning for ADC (Design Choices)

I have a low frequency (50Hz) signal which can be positive or negative (centered around system ground) depending on the mode selected. The signal has a maximum amplitude of +/- 12V. So, just to be ...
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### output offset: dual supply opamp running on single supply

I'm running a precision rectifier circuit on TL082. http://www.ti.com/lit/ds/symlink/tl082-n.pdf supplying dual supplies (+/-12V) has it working correctly, however a single supply(0-12V) does not. I'm ...
3k views

### design: low voltage clamp circuit (0-200mV)

I need a active safety circuit to clamp voltages to the range of 0-200mV, independent of temperature and very precisely. I have simulated, using TINA-TI, 4 precision clamps in series to do this, see ...
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### How do we get output like that with full wave precision rectifier?

First of all look at my circuit. If we assume a sinusoidal signal as input Vin then the signals V01 and V02 should be like the signals shown in the picture. From the two signal how can we get the V0 ...
4k views

### OpAmp Precision Half Wave Rectifier

I am currently studying OpAmps and one of the topics that came up was the applications of OpAmp circuits. In particular, I was learning about precision rectifiers (using non-inverting version of it, ...
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