# Questions tagged [multiplier]

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

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1answer
88 views

### 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 ...
1answer
62 views

### 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, ...
4answers
2k views

### 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, ...
0answers
35 views

### 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 ...
0answers
102 views

### Frequency multiplier from kHz to MHz

I'm not familiar with electronics at all, and would like to get some ideas to implement frequency multiplication of LVCMOS. I want to multiply the frequency in the range of 250 kHz by a factor of 10 ...
3answers
100 views

### 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 ...
0answers
47 views

### How to control charge on a high-voltage capacitor after voltage multiplier?

Can anyone think of an electronic way to control the charge on a high-voltage capacitor that is fed by a multi-stage voltage multiplier? I can control the charge on the way up by controlling the ...
0answers
40 views

### DC Voltage Multiplier for Positive and Negative Input

I have a small DC motor being driven by a controller which supplies +6V/-6V to the motor to control its speed and direction (elliptical machine resistance control motor). The issue is that 6Vs is not ...
1answer
83 views

### Problem in blocking and non-blocking - verilog

I have this code and I am having a problem in the product output, any ideas? I've tried a lot and it doesn't work.
2answers
136 views

### issue with booth multiplier VHDL code

I'm trying to build a 4-bit booth multiplier using VHDL. I don't know why but the process block is executed just once. The state does change from idle to busy then it doesn't work. ...
1answer
70 views

### Can you get values of the components in the circuit?

I have a mosquito repellent circuit diagram (voltage doubler) with printed values. Can anybody find the actual component value of the capacitors?
1answer
423 views

### Gilbert cell. Understanding the basic

I am trying to understand a concept of Gilbert cell. I have the next figure. Quastion1: If +1V is set up in (3), then in (4) is admitted -1V, and for (5) is -1V, (5) +1V. The current source is sume ...
1answer
46 views

### C-W Multiplier Unipolar Input

I was seeing some circuits for a Cockroft-Walton multiplier.Most of them seem to be using an AC input voltage.My specific query is ,would this multiplier work with a uni-polar (pulsed DC) input. For ...
1answer
836 views

### 4-bit binary multiplier circuit

I have made this 4-bit binary multiplier circuit, but the product of, for example: B3B2B1B0 (1100) x A3A2A1A0 (0001) = P7P6P5P4P3P2P1P0 (00101000) and not 1100, What have I done wrong?
1answer
114 views

### How is the signal Multiplied with the Carrier in AM

In wireless transmission, via Amplitude modulation, we multiply the message signal by a carrier wave to get the modulated signal $$x(t) = m(t) \times cos(\omega t)$$ Where $m(t)$ is the original ...
1answer
405 views

### Resistance Multiplier

The circuit below is a resistance multiplier but I am having trouble deriving the effective input resistance, which should be a multiple of $R_b$. The answer should be something like R_{\text{in}}...
1answer
227 views

### Bug zapper project with counter

I have this evil thought that building a fly zapper with a counter every time it works. There are two ways in my mind, first one is hacking a bug zapper product which I already have (hand grip style, ...
4answers
466 views

### Analog analog multiplication, part of a hybrid CPU (for fun)

Short version: How do I make an analog multiplier that takes two analog DC inputs? Long version: I made a comment recommending Ben Eaters videos for another question, while doing so I ended up ...
1answer
59 views

### Help with frequency multiplying

I'm generating a 15MHz sinusoidal signal from a Colpitt oscillator that i want to multiply to 90MHz. I'm thinking about doing a triple multiplier and a double multiplier to get the right frequency. ...
2answers
87 views

### does frequency multiplier work with signal that contain multiple frequency components?

for example, say we have a wide band frequency multiplier that takes the input of 100MHz-200MHz and the output have frequency of 300MHz-600MHz（a frequency tripler). if the signal contains a 110MHz ...
2answers
411 views

### VHDL 4-bit Shift-and-Add Multiplier Buffer and Out port error

I am working on a creating a 4-bit Shift-and-Add Multiplier. I am getting this warning message - "WARNING:HDLParsers:3555 - "//filer1.egr.msu.edu/samarar1/ece230/Project05/Project05.vhd" Line 220. ...
2answers
1k views

### Mosfet based ripple filter for tube amp

I need some hint to fully understand how this circuit works (credits to Audio Design Guide): simulate this circuit – Schematic created using CircuitLab My doubts are in the operation of the ...
0answers
243 views

### Maximum frequency for use of polarized electrolytic capacitors in voltage multiplier circuits

I would like to build a capacitor-diode style voltage quadrupler driven by a sine wave or square wave generator with frequency in the range 10khz-100khz. My concern is the type of capacitor I need to ...
3answers
228 views

### Are there any drawbacks to this oscillator frequency multiplier circuit?

I'm trying to make an upconverter from 65 MHz to UHF band using a mixer; I therefore need an oscillator frequency around 375 MHz to mix with the 65 MHz base signal. I'm also trying to vary the ...
1answer
202 views

### How to create discrete high voltage oscillator?

I need to increase 24 V DC to 1.5 kV DC. Using a voltage multiplier would require over 60 stages. I am considering using a few stages of a voltage multiplier, say 8, to increase the voltage to about ...
1answer
91 views

### Power IR2110 from a low voltage AC Source

I am trying to power the IR2110 using an AC Source. However, this source is also connected to a full wave bridge rectifier that's going to supply a controlled buck converter. I tried using a voltage ...
2answers
60 views

### In a voltage multiplier, must the frequency be low enough to allow for charging in first stage before switching?

For example, in a four stage multiplier, taking 150 V to 300 V, 450 V, and 600 V... Is it common to charge the first stage capacitor to maybe 50 V (given a high switching frequency) and propagating ...
2answers
76 views

### Do we have binary dividers cicuit on cisc computer? [duplicate]

Just like we have binary multipler circuit in cisc computer so do we have binary divider circuit in cisc computer? Or it is just like we use algothrims instead of having a real divider circuit? (Just ...
2answers
237 views

### Do we have binary dividers circuit in CISC computers? [closed]

Just like we have binary multipler circuit in cisc computer so do we have binary divider circuit in cisc computer? Or it is just like we use subtractor multiple time instead of having a real divider ...
2answers
123 views

### Voltage multiplier

please be patient as I am not a electrician/electronic engineer. I am wanting to make a negative ion generator to attempt to make a powder coating gun, I know they are cheap but I like to build for ...
1answer
289 views

### Order capacitors by leakage rate in Cockcroft-Walton voltage multiplier

Looking at a system like the Cockcroft-Walton multiplier posted here: https://www.allaboutcircuits.com/textbook/semiconductors/chpt-3/voltage-multipliers/ To use 400V 100uF electrolytic capacitors ...
1answer
49 views

### How to derive this formula from this schematic?

This is the voltage multiplier from the paper ,it said the rectiﬁed output voltage is given by $V_{out_i}$= $V_{out_{i-1}}$ +$2(V_A-V_{ON})$,$V_A$ is the AC voltage amplitude at the input;\\$...
1answer
626 views

### Voltage Multiplier Frequency and Waveform

Note: I am aware of this question. It is 6 years old and I didn't find an answer there and I didn't want to necro the question. As part of a school physics project I need a very large voltage. I will ...
1answer
73 views

### Does a RF frequency multiplier work with ultrashort pulse?

The question is, does a RF frequency multiplier work with ultrashort pulses? In another words, does the frequency multiplier change the pulse width of input signal? For example, suppose we have a ...
1answer
2k views

### analog multiplier using log and antilog amplifier issue

I'm trying to build an analog multiplier that takes any two voltages and produces the product for them This is the basic layout of the circuit: can this layout do what I need? I know there is ...
1answer
67 views

### Combinational Linear Shifting VHDL

I am designing a 32 bit floating point pipelined and synthesizable adder/multiplier as part of group for a class in school. I was put in charge of the re-normalization. Part of this is left or right ...
1answer
123 views

### switched capacitor voltage doubler for strobe circuit

I am interested in making an LED blink fast with a low duty cycle. To make the LED bright again (despite the low duty cycle), I thought I'd try to use some sort of charge pump to overdrive the LED. I'...
0answers
121 views

### Conceptual confusion about voltage multiplier circuits

I can do circuit analysis of the half-wave series multiplier (also called Villard or Greinacher cascade or Cockcroft-Walton multiplier) and see that it works, but I have several conceptual confusions ...
2answers
375 views

### Why do we do right shifting in Booths algorithm?

I know the working of booths algorithm. Suppose we have multiplicand M = 01011 and multiplier Q = 01110 We can write Q as (2^4 - 2^1). So multiplication reduces to 2^4(M) + 2(-M) Now booths ...
2answers
700 views

### How can I multiply square wave circuits?

I would like to generate a signal that consists of a 1 kHz signal, which switches to a 100 kHz signal, flipping from one to the other at a rate of 10-100 Hz. I have access to signal generators to ...
1answer
74 views

### Peak detection using an analog switch

I have a sinusoidal signal of 500kHz with 1V(peak to peak). I need to peak-detect this signal. I found out that using OPAMPs and diodes can not provide a good peak detection. It was pointed out to me ...
1answer
216 views

### Why is there a capacitor and resistor added to this voltage quadrupler?

I'm not sure how to use the schematic function with stack exchange so I'll be posting these pictures. I wanted to repurpose the circuit in a fly zapper to make sparks. I drew a circuit I saw from the ...
3answers
93 views

### Control Output Shock From Cockroft-Walton Doubler

so I'm building a device that charges a capacitor bank to between 1kV and 2kV. The goal here is to use a 555 timer to control a shock pulse from the capacitor bank. I can touch the ouputs of the bank, ...
3answers
3k views

### How does a Gilbert cell work?

So, I am familiar with what a Gilbert cell is and what it does, but I have looked through all the resources I can find trying to understand it and I just can't wrap my head around it. Just from ...
1answer
682 views

### Voltage Multiplier - Cockcroft-Walton Capacitance Value

I want to design a circuit in order to Harvest radio-frequency (RF) signals and get a DC Output to a specific load (i.e micro Watt Battery of a sensor). Notes to be considered : input will be ...
5answers
2k views

### What are some ways to improve a voltage multiplier?

I am working on a Nixie power supply, but I would like to improve it. I have 4x9V batteries in series for a total of 36V to be switched across a multiplier. A (TTL) 555 timer is running astable from ...
1answer
120 views

### Very quick Question to those familiar with analog multipliers, specifically AD633

Bit of a basic tech question, but having looked through all the datasheets and also having used AD633 for years now, I am not sure what its 'base unit' is? What I mean is, I want to now multiply ...
1answer
289 views

### Receiving 27MHz wireless power

I am designing a high frequency passive RFID tag-like device that receiving 27MHz wireless power, use it to power a onboard MCU and a low power transmitter. The estimated current drain is about 50mA. ...
1answer
2k views

### Building a 5-bit Multiplier

I'm currently learning digital logic and have been tasked with building a 5-bit multiplier using only simple gates. I saw it recommended here to use a truth table to help you build the circuit. ...
1answer
338 views

### Problem with accuracy of AD633 multiplier

I have 3pcs of AD633 chips, and the accuracy should be ±1% (typical), ±2% (max) according to datasheet. I wired it like this: I tried several input voltages, but it seems, that output is still way ...