Questions tagged [multiplier]

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

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18
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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 ...
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4answers
514 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 ...
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3answers
3k views

Designing a simple ALU

I need to design an ALU with two 8-bit inputs A and B and control inputs x, y, and z that supports the following operations: ...
8
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1answer
14k views

Voltage multiplier calculations

I want to make a voltage multiplier to gain a high voltage, I understand that you must input AC for it to work and you get DC out. I also understand that the multiplier is made up of capacitors and ...
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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, ...
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3answers
29k views

3-bit multipliers - how do they work?

I need to understand how 3-bit multipliers work and then I must design one. I've read through Wikipedia's binary multiplier but I just can't wrap my head around it. I don't understand where to start. ...
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1answer
1k views

Parallel multiplication hardware

This picture is taken from Computer Organization and Design, Fourth Edition, David A. Patterson, John L. Hennessy. Sorry for the low resolution. I cannot get my head around it. I can see why the bits ...
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1answer
5k views

Two's Complement Multiplication Overflow

I was reading through a textbook of mine and found a question that I really can't figure out. It asks to find a pair of two's complement numbers which will result in an overflow if they're multiplied ...
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2answers
726 views

large digital multiplier IC

I was in college 18 years ago and saw a classmate's project that had a very large DIP IC on it (roughly 1"x4" !) which he said was a digital multiplier IC. (I assume it was 32x32 -> 64) I'm curious ...
4
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1answer
9k views

2-bit adder and Multiplier

I am trying to wire a 2 bit adder and a Multiplier on my breadboard. I have the 2 bit adder somewhat done, but dont know where to start on the multiplier. I need help reading circuits and translating ...
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2answers
2k views

Polarized capacitors in voltage doubler

Consider this voltage doubler: . I simulated the circuit using NON-polarized capacitors and WITHOUT the transformer as in this schematic: and the output voltage (at C1) was still doubled. I have a ...
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3answers
15k views

Creating a verilog code for 4-bit multiplier using lookup table

I am having trouble creating a verilog code for a 4-bit multipler using a lookup table. I am still trying to grasp the concept of a lookup table. If anyone could help me it would be greatly ...
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1answer
1k 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?
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1answer
742 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 ...
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3answers
1k views

LUT vs. hard IP based multipliers on Spartan-3 FPGA for constant coefficient multiplication

Before I get to my question, here are the specs for the board and synthesis tool I am using: Family: Spartan3 Device: XC3S200 Speed: -5 Synthesis Tool: XST My 4-bit multiplier is in my design's ...
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1answer
338 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 ...
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1answer
652 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 ...
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4answers
881 views

GPS Antenna Selector: How to electronically select one antenna from multiple available antennas?

I want to connect multiple GPS antennas to a single GPS module and select one of them based on some logic. Basically, I want the module to receive signals from only the selected antenna. Is there an ...
2
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2answers
589 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. ...
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2answers
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Verilog : Combining sequential logic with combinational logic

I am trying to implement a sequential shift and add 4bit multiplier as shown in the image. I am having a separate module for the 4 bit ripple carry adder. I have tested the adder module and it works ...
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2answers
156 views

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. ...
2
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3answers
295 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 ...
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1answer
226 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 ...
2
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1answer
208 views

Implimentation of BZFAD using VHDL

I'm novice to vhdl coding. I'm implementing BZFAD which is a low power multiplier. In the Block diagram as shown below I have a transistor block(M1) whose input are driven from the ring counter. I'm ...
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1answer
3k views

What's wrong with my voltage multiplier segment?

The moment I learned about voltage multipliers I was really excited. What an awesome way to kill yourself! I found a high voltage multiplier guide and using the image below, I created my first ...
2
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1answer
254 views

Synchronizing multiplier with adder to form mac

I have designed an 8-bit multiplier in Verilog which takes a maximum of 8 clock cycles to give the product. I have also coded a 16 bit adder based on combinational logic. I now want to integrate the ...
2
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2answers
275 views

Ultra low power adders and multiplier

I am working on a low frequency 30 khz module that needs to have an ultra low power consumption. The problem is the research focuses on improving the performance of the adders and multiplier and doesn'...
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1answer
188 views

Multiplying the deviation from mean of two time varying voltages

If I have two time varying voltages, \$V_1\$ and \$V_2\$ coming from two light detectors, how would I go about 'multiplying' the two signals with an electronic circuit? The voltages vary \$\pm 5V\$ ...
2
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1answer
523 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}}...
2
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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 ...
2
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1answer
3k views

Analog multiplier using logarithmic and anti-logarithmic opamp issue

I'm trying to build a analog multiplier that takes in two voltages and produces the product of them. I have tried to simulate a circuit with finds the log of two voltages, sum them and then find the ...
2
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1answer
316 views

Help design multiplication / modulation stage

I'm a self-taught amateur analog electronics enthusiast, I wonder if I can get some basic help on a simple circuit to demonstrate an interesting mathematical concept. (Not a homework assignment, but a ...
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1answer
699 views

Capacitor in an voltage doubler

In a standard diode voltage doubler (multiplier): Does the capacitor also plays the role of smoothing out the output voltage?
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2answers
778 views

What does register and bus size depend on?

So here is a hardware sequential multiplier depicted. Number A is 51 bits width, number B is 48 bits width. I have to choose the most efficient size of buses and registers (optimize according to ...
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2answers
2k 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 ...
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1answer
125 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 ...
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2answers
10k views

Circuits for Multiplying two Analogue Signals - AM Modulation

I've recently been learning about various communication topics and modulation schemes. One of the most basic is Amplitude Modulation and DSB-SC. Both of these modulation schemes (in addition to ...
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1answer
2k views

Synthesis of a multiplier design

I have written a verilog code for a multiplier which gives correct results after simulation. But, the code generated after synthesis of the above mentioned code does not give correct results. In fact, ...
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1answer
136 views

How to set modulation depth with modulating a signal with an analog multiplier?

For example, I have an AC signal V1 which I'm modulating with another AC signal V2. When V2=0 the output will be also 0 (since a simplified transfer function of the analog multiplier is V1*V2=W). This ...
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1answer
744 views

How can I increase the multiplier of a voltage doubler circuit using IC4049?

I replicated a voltage doubler circuit from this example I found online: ... and as expected, I am getting 12V from a 6V input. I would like to increase the multiplier to more than 2x, but I am ...
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2answers
512 views

Bit compression in Verilog

I am trying to write a Verilog code for a multiplier based on the abacus principle. I want to compress an array of 8X15 bits to the lowest rows. For e.g. for an array of ...
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1answer
7k views

How to multiply using gates?

I need to multiply 2 3bit numbers. I tried that: but it does not seem to work. In this example, the output should be 49. so that is that 77?
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1answer
87 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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1answer
262 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, ...
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2answers
70 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 ...
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1answer
78 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 ...
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2answers
812 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 ...
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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 ...
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1answer
3k 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. ...
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1answer
1k views

propagation delay (low -> high / high-> low)

i build a 2x2 bit multiplier circuit where i take a number (a1a0) and multiply it by (b1b0) . and im asked to calculate the time propagation from high to low , and from low to high for every input to ...