# Tagged Questions

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

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### tvalid delay in AXIS

I am trying to feed the cosine wave from the DDS compiler to the multiplier and multiply with another cosine wave. The output of the multiplier is then feed into a CIC compiler as shown below. I ...
60 views

### frequency multiplier

I need to generate a sine wave with freq of the order of GHz. I have generated a sine wave of around 20-30 MHz. So I am thinking of using a frequency multiplier circuit. Any ideas how I should proceed ...
40 views

### Independently toggling two series switches to multiply two pwm signals

Preface It is known that one can synthesize a signal into a train of boxcar pulses (pwm modulation), each with the same amplitude, if proper low pass filtration is applied to this pulse train before ...
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I built a driver for a pulsed laser. This required a low voltage DC source to provide a bias current through the laser and also a high voltage DC source to drive an avalanche transistor to make the ...
158 views

### VHDL Code for 4x4 Mult: SYNTAX OK BUT ERROR:HDLCompiler:1029

Hello this is my first post here, I have some code that I've written that I'm having trouble with. I was hoping I can get some help. I'm having some issues with my VHDL code for a 4x4 multiplier. ...
129 views

### A conceptual question about voltage multipliers

Imagine a micro-controller's pulse output is coupled to a voltage multiplier with many stages such as in the case of a Dickson voltage multiplier. We then can increase the DC "voltage" level of the ...
38 views

### How to multiply voltage of a pulsating positive only source?

Total newbie here. I'm trying to multiply the voltage of a positive only pulsating source. It variates from 0v to 500v. All voltage multipliers I found explain how they work with a AC source, ...
181 views

### Multiplier 4-bit with verilog using just full adders

I am trying to write the test bench part but I don't know how to do it. Basically, I want to test out 0x10 or 5x5. I don't if what I have is right. here's a pic to give you some idea of what i am ...
64 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 ...
128 views

### 4 bit multiplier logic gates diagram

I have an assignment that requires building 4-bit Multiplier in two ways: 1) using only FA1bit and AND logic gates. 2) using only FA8bit(Full adder for 8bit numbers) , Mul2bit(Multiplier for numbers ...
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I wish to control a programmable power supply to deliver constant power (watts) into a heater. The heater resistance varies from unit to unit due to manufacturing tolerances. The PSU has a '...
1k 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 ...
105 views

### Multiplication Gate Delay

How do you find the gate delay for a basic multiplier circuit that ANDs each bit of the multiplicand with the multiplier then shifts the multiplicand left and the multiplier right until the multiplier ...
155 views

### How a multiplier will be implemented with LUT?

How a multiplier will be implemented with LUT(LookUp Table) or with optical LUT?.... I know how the full-adder implemented with LUT and OLUT.
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### Which household electronics contain or used to contain photo multiplier tubes?

I would like to get my hands on one, but I am unsure where to find them (other than online). Are there any old household electronics that have them, used to have them? I am willing to go scavenge ...
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I'm writing code in verilog that take A,B as 8 bit input ,multiply them using radix -4 method . when i execute the code the shft output appear as "xx0" and mutipler can't take the value of the input ...
2k 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 ...
394 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 ...
229 views

### Wallace tree multiplication rules

I was looking at this wallace tree diagram for an 8x8 multiplier: and I'm confused about why the pairs of two (and the one pair of 3) are not added together in the initial reduction layer. My ...
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### Learning about multipliers, confused about cycles in relation to Wallace tree

At this link: http://en.wikibooks.org/wiki/Microprocessor_Design/Multiply_and_Divide_Blocks It says that a wallace tree can be used to perform multiplication in a single cycle. I'm assuming then ...
78 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 ...
255 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 ...
39 views

### How to design a unit that outputs 1 on the first rising edge and 0 on the second rising edge in the design of a multiplier?

I want to use this unit to control the shift register in a multiplier. The shift register should load then shift and load... until it stops. When the LSB of the multiplier is 0 it should simply shift ...
163 views

### Parallel MAC unit based on modified booth algorithm

The below diagram is the parallel MAC structure. In parallel MAC both partial product addition and accumulation take place at same time. The partial product summation + accumulation unit of above ...
313 views

### Cockcroft-Walton voltage multiplier can be built with electrolytic capacitor or not

i know that capacitor is usually work with ac supply as in dc acts as a open circuit after charging , so can electrolyte capacitor be used in Cockcroft-Walton voltage multiplier , or it will explode ...
216 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 ...
451 views

### Full wave doubler difference and connection of neutral and phase

I'm testing a circuit for creating am unregulated "HV"DC source. The circuit is like this: simulate this circuit – Schematic created using CircuitLab The example I'm using uses a Variac ...
788 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 ...
202 views

### How can I create a DC-DC voltage multiplier [duplicate]

I want to take the 5V output from a USB port and make it 12V, so that I can run a cooling fan which is 12V. Is there any circuit I can make at home myself? If the output voltage is not exactly 12V, it ...
504 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, ...
219 views

### defining base frequency, multiplier and divisor for dynamic clock manager

I am using a Spartan 6 xilinx FPGA, I managed to get it all working, changing the multiplier and divisor parameters at runtime. DCM_CLKGEN I use. My real oscillator is 66.6 MHz, but with PLL_BASE, I ...
168 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 ...
179 views

### Synthesis of Verilog code in Cadence

I am trying to synthesize my Verilog code, which I wrote using Modelsim tool for 8-bit MAC in Cadence Encounter. The file that is generated after synthesis has to be re-checked for functionality in ...
189 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 ...
2k 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 ...
163 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 ...
973 views

### Analog Multiplier with MOSFET - Implementation not working

simulate this circuit – Schematic created using CircuitLab I am using the above circuit to multiply BAT1 and V2, the circuit analysis tells me the output voltage Vm1 should be BAT1xV2x2xKxR1 ...
11k 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. ...
153 views

### Digital-to-analog conversion of a product of digital inputs

If we have a 4-bit DAC, which converts a 4-bit binary signal $X = X_3 X_2 X_1 X_0$ to an analog signal $Y=X/2$ (i.e. 1010 -> = 5 V, or 0111 -> 3.5 V). How can we create a DAC, using any number ...
254 views

### How to clear a 4 bit shift register with no clear input?

I have 4 bit pipo shift register 74ls95 . It does not have an clear input. Is there any way to clear the register without giving all the parallel inputs as zero. I am using it as an component of shift ...
175 views

### Is it possible to buy high pass filters that work in the 100 kHz range?

I want a device that rejects 100 kHz but lets through 150 kHz. I tried building a simple passive first order circuit but the roll-off wasn't sharp enough. Most standard electronics vendors don't seem ...
201 views

### Complexity comparison of an adder and a multiplier

I have two algorithms with different requirements of addition and multiplication operations as follows: Algorithm 1: 100 additions 200 multiplications, total = 300 operations. Algorithm 2: 300 ...
493 views

### Why AD834+AD811 voltage controlled amplifier does not accept around ground signals?

I have setup a circuit according to page 15 of AD811 Op-Amp datasheet . The design receives 0.5-1.2 vpp sine wave between 1Hz-50MHz from AD9850 DDS and it also has around +0.7 to +1 v offset voltage. ...
315 views

According to page 15 of AD811 datasheet , it can be used as a voltage controlled amplifier in conjunction with AD834 . In the schematic below, I am a bit confused about the configuration. If we ...
239 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 ...
4k views

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 ...
862 views

### Multiply 4 Digit Binary Number By 3 - Circuit

I want to find a way to multiply a 4 digit binary number by 3. I have this circuit that doing this process and I don't understand how it works. To multiply a number by 2 I need to shift the digits ...
5k views

### 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 ...