# Questions tagged [multiplier]

Voltage multipliers - circuits that transform AC supply voltage into a whole number multiple of DC output voltage.

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### Variable Analog Multiplier (Resistor Values, Concepts)

Is there a way to create a variable analog multiplier using conventional op amps? I've been trying to wrap my head around analog multipliers, and I haven't been able to come up with a reliable answer ...
1 vote
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### DAC used as multiplier

I have tested a circuit with DAC (MCP4922). Using it as multiplier, reference sine wave is applied to VREF pin and sine wave of same frequency is applied as digital input to DAC, I didn't went deeper ...
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### What is the general rule for combining smaller hardware multipliers to create a larger multiplier?

FPGAs have DSP blocks that are hard multipliers. These have a fixed upper size for operands e.g 9 bit each or 18 bit each e.t.c. The actual size depends on the vendor and FPGA family. Now I know that ...
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1 vote
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### How many clock cycles does a multiplier take?

Here is a filter. The following is a snippet from DSP Integrated Circuits (Academic Press Series in Engineering) by Lars Wanhammar What's the maximum sample rate for lattice wave filter? The ...
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### Practical Implementation of A Two Quadrant Transconductance Analogue Multiplier [closed]

Currently cannot simulate a functional Two Quadrant Transconductance Analogue Multiplier. Understood constraints: Vx is small (Vx << Vt ~ 25mV) Vy is greater than VBE(on)(0.6V) (a DC offset ...
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### What options are there for multiplying clock pulses by non-harmonic values?

I have a MIDI clock signal which will output pulses at 24ppqn and a device I would like to synchronise which runs at 64ppqn. This is equivalent to a an ⁸⁄₃ clock multiplication. My current method is ...
540 views

### Practical Multiplier circuits using log/anti-log amplifier

I'm trying to build a circuit that output the product of the 2 inputs using TL974 opamps. Looking for something like Vout = Vin1 x Vin2. I found this design which should give something like Vout = ...
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### 3x analog signal multiplier

I was looking for sin(x) in, sin(3x) out. I am aware of PLL, diode, and AD632 multipliers. Most are either squarers for sin(2x) or pure sine or amplitude multipliers. I saw the sin(a+b) identity and ...
105 views

If I understand it correctly, the Dadda multiplier adds the partial products in a similar way compared to the Wallace multiplier, but it doesn't reduce the partial product terms as much in its tree ...
281 views

### Why is this extra bit width necessary in a multiplier?

In a discussion on multiplier circuits, my textbook (Brown and Vranesic's Fundamentals of Digital Logic, 3e) write that When a shifted version of the multiplicand is added to a partial product, ...
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### Multiple leads to one channel of labscope

What would be the best thing to use to block the ground signal of a fuel injector while monitoring all 4 signals at one time attached to one channel of my labscope.The main use would be on the ground ...
1 vote
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### What am I doing wrong with this 2x2 Karatsuba Multiplier in Verilog HDL?

I am trying to implement a 2x2 karatsuba Multiplier which I will be using as a base case for a higher bit multiplier. Here's the code: ...
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### Why is my Karatsuba multiplier not giving right answers for large numbers?

I tried to implement 16-Bit Karasutba Multiplier in Verilog HDL. It gives me right answers for small numbers, but it's incorrect for large numbers. Can someone point out what's wrong? Here's the ...
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1 vote
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### Do voltage multiplier circuits and transformerless power supplies have functional similarity? [closed]

I saw diagrams of voltage multipliers like in the picture below. To my understanding, it seems like they have the same function as transformerless but the use of a voltage multiplier is to increase ...
588 views

### Voltage multiplier operating principle with pulsating DC

I need to generate up to 2 kV by pulsing a DC 1kV source. The circuit I used is the following: Clearly, this circuit is intended for an AC input that has both positive and negative halves where as in ...
127 views

### Multiplier using op-amps not simulating properly in LTspice

I'm trying to create a square of two signals (3 and 4 V) using multipliers logic with only opamps in LTpsice, but the Vout is incredibly high (about -400 kV for 3 V) and not accurate. Any idea why ...
862 views

### How do I simulate an analog multiplier in LTspice? [closed]

I need to perform the squaring of two input voltages and I'm not sure how to go about that without a multiplier.
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### Having trouble understanding textbook explanation of "hot chassis" in full-wave voltage doubler vs half-wave

The textbook explanation is not doing it for me. The half-wave voltage doubler shown in Fig. 4-27(a) offers some improvement in safety over the full-wave voltage doubler. Compare Figs. 4-24(a) and 4-...
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1 vote
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### High voltage multiplier attempt - low voltage output

I have built a 15 stage voltage multiplier in hopes of multiplying an input voltage of 2kV to ~70kV. This voltage multiplier has been constructed with 3kV 1nF ceramic capacitors and diodes rated at ...
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1 vote
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### Analog Circuit Modelling in Simscape (Simulink) doesn't work (No Input sighted)

I tried rebuilding the analog circuit for the Lorenz Attractor in Simulink using Simscape toolbox. Luckily they have also an analog multiplier circuit built-in and I re-wired everything just as the ...
521 views

### VHDL: Booth's multiplication algorithm process block not working as intended?

I am trying to implement Booth's multiplication algorithm using this flowchart in VHDL. So far, I have written the code below: ...
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### Are there any "Both Rising Edge and Falling Edge Triggered" Shift Register?

I was designing this circuit in Logisim-evolution. In the book, it is mentioned that an n-bit multiplier would require n-clock cycles to work. I think this will be possible only when we have the shift ...
133 views

### Does diode reverse recovery time in Cockcroft-Walton Multiplier depend on current or negative voltage?

Say there is a multiplier whose sine wave input is 1 kV, 50 kHz, output should be 10 kV, 100uA. The high frequency means a fast diode should be used (low reverse recovery time trr). However, it seems ...
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1 vote
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### Trying to implement a squaring circuit [duplicate]

Using the results from a previous question i want to implement a squaring circuit. This circuit was posted by some other user in the answers. Below is an image of the squaring circuit used. I have to ...
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### Can this ZVS driver power a Cockcroft Walton Multiplier?

I'm having trouble figuring out how to connect my ZVS driver (30-50khz) to this Cockcroft Walton multiplier (CWM.) I'm starting to wonder if it can even work with this circuit. Its maximum arc gap is ...
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### TC962 Voltage Doubler - Why the slightly lower output?

I am prototyping this voltage doubler circuit based off the datasheet of the TC962. Capacitors are GRM21BZ71E106KE15L. When applying 9V at the input, the output is 17.96V at no load. When drawing ...
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### Cost effective way to generate THz frequency

Kicking around some ideas here as how to multiply a relatively low RF GHz frequency to the THz range. Would simply using a cheap 4400MHz RF signal generator and a couple inline RF frequency ...
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### How to determine resistors for rectifier bridge wattmeter - Hewlett patent 3662264

More than 40 years ago I worked for a company that sold, modified, and serviced a wide range of electronic instruments, including wattmeters. In particular, we built watt transducers that used a core ...
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### How do I achieve well-formed pulses in a Dickson charge pump?

A picture is worth a thousand words, and I tend to make a lot of mistakes in my words, so, first picture, the circuit in question: I know the Dickson charge pump looks a little different but it is ...
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### Impedance calculation of a four stage Dickson voltage multiplier

I built a four stage Dickson voltage multiplier for RF energy harvesting at 2.45 GHz. This is the circuit which I built. My components are BAT54S as diode and 100uF capacitor. I need to calculate the ...
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### What is the relation between NE555 voltage doubler output voltage vs load?

Considering this circuit (NE555 voltage doubler), how can I find the formula for the relation between the value of the load resistor and the output voltage? You can see below two examples of this ...
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### Signal multiplier circuit using op amp concepts

Design a circuit that from two sinusoidal inputs generates the output $s(t) = \sin(2π f_1 t) \times \sin(2π f_2 t)$, where $f_1$ and $f_2$ are two distinct frequencies between 1 kHz and 10 kHz. ...
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### BJT type Gilbert cell does not work

I designed a Gilbert cell for analog multiplication, all the transistors (NPN) are in active region as I checked one by one, however, the result does not seem correct at all. How can I make it better? ...
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### Trouble with VCA as signal amplitude control

I designed (and tested) the classic analog multiplier composed with operational amplifiers. However, the voltage resulting from the operation did not correspond to the product of the input voltages. ...
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### Op-Amp Based Multiplier LTSpice Simulation

I'm supposed to make a multiplier with log amplifier configuration using LM741 op-amps and 1N4001 diodes. I found this circuit configuration in this Youtube video. However, the output voltages I get ...
140 views

### Concept of Booth Encoded Multiplier 8bit

So I'm kinda a newbie in this world so pardon me for the basic questions. I want to implement Booth encoded multiplier 8bit. Until now, I pretty much understand for the block diagram and what happened ...
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1 vote
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### Need help understanding voltage multiplier in boost SMPS

I made a 4x multiplier on the switch node of a boost circuit. I don't quite understand how DC pulses behave in a voltage multiplier. C1, C2, C4, and C10 don't seem to contribute to series discharge. ...
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