# Questions tagged [multiplier]

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

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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 ...
434 views

### What is the purpose of diode between emitter and base in this capacitance multiplier?

The picture below is an excerpt of Figure 2 of a DC/DC boost converter (see PDF here). It is part of a capacitance multiplier. What is the purpose of this (anti-parallel) diode between emitter and ...
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### 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 ...
48 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 ...
101 views

### 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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### 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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1k views

### 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 ...
59 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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### Can this converter chip be used for 25W power conversion? [closed]

For this LTC1043 chip: Which does this: Can we deliver 1 amp of 25 volts +/- 6v (or something close to it) by dividing US-110V line voltage by 4? And why is this chip so expensive (\$5.33 in 1k qty) ...
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### How is the frequency multiplied by four here?

Here is the original circuit found from YouTube link. Since I don't have all the parts, I modified the circuit diagram: I have edited this circuit diagram. When I add the Zener the sound improved. ...
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### Multi Factor in electric meter

We have an engineering workshop. In the initial stage our connected load was 60 kW. 2 years back we have removed 50% of machineries and now the load is only 30 kW. In our electric meter manufacture ...
98 views

### Passive voltage multiplier output power

I have this voltage multiplier sextupler (Vin = 1 V, f = 4 Hz, l = 30 µH.) I would like to know the output power when the capacitor is charged to 1.5 V.
1 vote
443 views

### Radix-4 Booth's Multiplier verilog code error

I wrote the code for radix 4 booth's multiplier. But, I am getting 2 errors. I am not able to solve it. Could you please help? The errors are: Error: C:/modelsim_dlx64_2021.1/examples/assignment/...
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### wrong output of a multiplier in IP catalogue

I used a multiplier from IP catalogue in VIVADO. ...
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### Multiplier in FPGA

I have implemented multiplier by using IP catalog and added in simualtion as ...
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1 vote
376 views

### Proving the formula for capacitance multiplier

I'm looking into the mathematical justification of how a capacitance multiplier works. Here is the circuit. I have to prove that resulted grounded (multiplied) capacitance is (R2 * C)/R1 here by means ...
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### Calculating the capacitance for a voltage multiplier circuit

Recently, I've been asked to create a voltage multiplier, with an output voltage $Vo = 5*Vi$, where $Vi$ is the peak input voltage. This was accomplished without much issues through the schematic ...
1 vote
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### Why does two-BJT transistor-based capacitance multiplier show bad performance

I'm trying to understand why two-BJT transistor-based capacitance multiplier shows bad performance. The circuit (note that capacitance multipliers are bi-polar): Below are time output for usual RC ...
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### Designing subtractor using adder in Logisim for 1-bit ALU. How to implement Multiplier in my 1-bit ALU?

How can I design subtractor using adder in Logisim for 1-bit ALU (Arithmetic Logic Unit)? And also, how can I implement Multiplier in my 1-bit ALU? Here I tried to make 1-bit ALU which will perform ...
164 views

### Voltage multiplier circuit not working

I am trying to make a voltage multiplier circuit. When I connect it to mains $120 \; V$, the output voltage becomes $90 \;V \;DC$, I do not know why this is. Capacitors: $20 kV \; 1000 \; pF$ ...
969 views

### 4 bit Binary Multiplier [closed]

I've made the following 4 bit binary multiplier using a breadboard and in multisim. I have an adder connected to the multiplier, but I'm not getting correct results on my breadboard (I have LED's ...
125 views

### Analog multiplier using log and antilog amplifier

What should I add here to make it work? The output should be 3 * 5 = 15V.
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### Impedance of a Dickson Multiplier

Can someone help me in regards to calculating the impedance of a Dickson multiplier? It consists of capacitors of 3.3 pF and 2850 shottky diodes. They can be assumed ideal. It consists of 7 stages, ...
240 views

### 1-10Hz frequency count translated to PWM for stepper motor RPM

I would like to control the speed of a stepper motor based on an input signal that consists of short 12V pulses at a varying frequency of 1-10Hz. I know this is an easy task with a microcontroller but ...
348 views

### Why does my diode log amplifier in LTspice not match theory?

I am trying to learn about analog multipliers, and I'm trying to implement one using a log-antilog design. I am currently having some difficulties with the log part because simulating an ideal ...
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### Cockcroft voltage multiplier - Stages not building up voltage

We are trying to develop a Cockcroft voltage multiplier that is getting input from IC555 astable driver circuit. The circuit diagram for driver and multiplier is as shown below. The final objective ...
271 views

### Current sense resistor for high voltage

I have a 5KV DC output from a Cockcroft-Walton multiplier. The current is around few microamps as per the simulation. To prevent discharge, the 200Mohm resistor holds the voltage of the Cockcroft-...
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### Cockcroft walton multiplier output both AC and DC?

I was watching this video https://www.youtube.com/watch?v=ep3D_LC2UzU and I noticed that closer to the end he is probing the upper half of the circuit and the scope is displaying square waves , also ...
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### Cockcroft-Walton Multiplier strange voltage values

I am building a circuit that allows me to generate high DC voltages that can be used in conjunction with a 3He counter tube to detect slow neutron radiation. The circuit was designed by someone else ...
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### Multiplying oscillator signal with a pulse

I am trying to multiply my oscillator sine signal with my pulse. But, the voltage of the oscillator is too big so it saturates. This is the output I am getting from my oscillator. I am getting the ...
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### Shift left followed by round for performing: y=x+cz in hardware

I wan't to implement a simple arithmetic, given the following (say 8 bits) integers x,y,z $$y = x + c z$$ where 'c' is a fraction of a power of 2: 2^-1, 2^-2, 2^-3,... I was adviced to perform the ...
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### Flyback transformer vs neon sign transformer

I've been working on my spark gap Tesla coil, and I'm planing to use a 5kV 30mA neon sign transformer connected to a voltage multiplier circuit with 10 stages to get a higher voltage. Could I use the ...
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### Calculation of max possible current load from voltage multiplier connected to PSU 12V rail [closed]

today I found in a box a PSU with two 12V rails each delivering 17A (Fortron SAGA II 400W) and decided to step-up the voltage so can feed the DPS5020-USB DC-DC converter (rated at 60V/20A max output). ...
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### How to implement a 48x48 multiplier using DSP48E slices in Verilog HDL?

Is it possible to create a 24x16 multiplier using DSP48E slice from a 25x18 dedicated multiplier in Virtex-7? Please post a sample code... Are any advanced multipliers of these available?
1 vote
760 views

### Voltage multiplier - selection of values

I'm designing a circuit, which includes a voltage multiplier. The schematics of voltage multiplier is well known, but it usually appears without any specific values for capacitors and diodes: My ...
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### I designed and made this circuit but it produces only 360V when it should be producing at least +1000V

The circuit consists of a 9V battery (the input source) connected to a 555 astable multivibrator operating at 1.34 kHz frequency connected to a transformer and a long voltage multiplier chain. ...
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### What kind of hardware multiplier do modern processors use?

I was wondering what kind of multiplier implementations modern processors use. Is it some derived variant of booth Wallace tree algorithm? Are these kinds of micro-architectural details publicized ...
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### PLL (Phase Locked Loop)

I find a bit of confusion on the web about the use of the PLL. Sometimes I read that, given a certain input signal, it is used to generate a signal whose frequency is N times that od the input one, ...
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### How can I make 20-200 ohm variable resistor look like a 20-240 ohm resistor?

I have a fuel sender in my kit car that goes from 20R to earth (full) to 200R (empty). Unfortunately the gauge (constant current source, measuring resistance to earth?) expects empty to be 240 ohms, ...
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### Voltage multipliers work worse with more stages?

I'm simulating voltage multipliers (Dickson topology) with the stages from 1 to 12, following the paper "Design Optimization and Implementation for RF Energy Harvesting Circuits, 2012". The load was ...
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1 vote
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### Confused with voltage doubler circuit

This is how the book explains the process: Let me consider the first 90° of the input, the capacitor charges up to the peak voltage less the diode drop of D1, D1 is forward biased and D2 is reverse ...
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