Questions tagged [performance]

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How much can throughput of high throughput fizzbuzz be exceeded with special processor? [closed]

A popular answer on code golf stack exchange achieves 52 Gbps on fizzbuzz program. I am curious if the limits of throughput can be exceeded by using specialised hardware, processor, co-processor. How ...
Karan Dwivedi's user avatar
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0 answers
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LDO PSRR output impedance

Image source: Toshiba Application Note - Simple Guide to Improving Ripple Rejection Ratio of LDO Regulators Here they are showing that the PSRR can be calculated by a voltage divider at the output ...
AlfroJang80's user avatar
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Performance metrics for a VHDL/Verilog RTL design

Correctness and performance is everything in programming. Verifying it for software is relatively easy because you can "just" run the program and see if it crashes and/or is very slow. ...
Stand with Gaza's user avatar
4 votes
1 answer
181 views

Why hasn't DRAM speed kept up with CPU speed as technology improves?

In 1976, the Z80 processor ran at 2.5 MHz and a typical DRAM access time was 500 ns. Now, processors run at 4 GHz and DRAM access time is 50 ns. Thus, processors are over three orders of magnitude ...
Ken Shirriff's user avatar
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Running 400 Hz, 380 V spindle motor on 220 V, 3-phase VFD

I just (mistakenly) purchased a 380 V (400 Hz) spindle motor and I have a 220 V, 3-phase VFD. The manufacturer said the winding is a special configuration that performs equally well with either ...
mgc555's user avatar
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-2 votes
1 answer
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How to perform quality assurance? [closed]

The site description is given as "Q&A for electronics and electrical engineering professionals, students, and enthusiasts" and I'm interested in "QA for electronics". Though I ...
Ben's user avatar
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Is erasing flash memory supposed to be this slow? (S25FL127S)

I'm trying to interface with a Cypress/Infineon S25FL127S (https://www.cypress.com/file/177961/download - 16MB SPI Flash module) and the Erase commands are very slow. Testing with two different ...
bgp's user avatar
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1 answer
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No mention of eMMC random performance in datasheets

Any particular reason why none of the eMMC manufacturers mention random read or random write performance in datasheets ? Only performance mentioned in datasheets is for sequential workloads.
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3 answers
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Caveats of the RC phase shift oscillator

I was reading some articles online where it talked about this kind of RC oscillator. I just want to clarify some caveats about this circuit: From: https://learnabout-electronics.org/Oscillators/osc31....
Shocked's user avatar
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1 answer
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what is the relationship between horizontal frequency and CPU power? [closed]

I'm building a device that will read video input, encode it and save it to disk. I read about horizontal frequency as a measure for video capacity, in khz. is that the same hz as in CPU power? what is ...
VLCboy's user avatar
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Expected SDRAM access speeds?

I would like to get an idea of how fast SDRAM accesses should be. If I have a 32-bit ARM based processor running at 500MHz accessing an SDR sdram device clocked at 166MHz, what sort of read/write ...
Ronnie Shipman's user avatar
-1 votes
4 answers
229 views

Flash or EEPROM

EEPROM vs SD Flash I am working on a Arduino program (a game, a slot machine) that needs to store 16 bitmaps (the slot machine symbols) that are 32 * 16 bytes each (total 8192 bytes). The bitmaps are ...
Caspar Kleijne's user avatar
3 votes
1 answer
125 views

How can I improve my LED display code so that it reacts in real time?

This is a carry on question from my previous one and I was wondering how I can go about improving my code, which currently has an extreme delay in outputting the numbers to the display and also isn't ...
aLoHa's user avatar
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How can I exit my lookup table routine with the desired value?

How can I get my code to work correctly when I include ADC conversion in it? I have a working code that displays two digits on 2 LED displays using a p16f1829. However, a problem arises when I try to ...
aLoHa's user avatar
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How can I improve my buzzer application using a PIC16F1829

I am trying to improve my assembly code (see below) for PIC16F1829 by using a macro to set up the parameters to play an audible sound. My previous attempt had used a macro BEEP, which has now been ...
aLoHa's user avatar
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Sustained SPI communication FT232H

Background I am using FT232H to communicate with my peripheral using the libMPSSE provided by FTDI. I am aware of the INFRA_SLEEP(2) issue with SPI_ToggleCS() function. My peripheral requires me to ...
sandeepzgk's user avatar
3 votes
3 answers
1k views

Alternatives to FT232H for USB to SPI communcation

For my current use case, I am using FT232H as a general purpose device that changes my USB packets into SPI information as an SPI controller for my SPI peripheral. My SPI peripheral can support upto ...
sandeepzgk's user avatar
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1 answer
105 views

Why are thermal limitations preventing progress in CPU development? [closed]

After reading this excellent question, it seems that thermal issues are currently one of the largest limiting factors in CPU design. What specifically is preventing forward progress with heat removal?...
dalearn's user avatar
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Roofline model for an FPGA

I see that the computational and bandwidth roofs are calculated based on the total amount of available resources (i.e. DSPs) and total possible bandwidth of all buses (i.e. high performance RAM-DMA ...
Nazar's user avatar
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1 answer
317 views

How to increase the power of the motor control controller? [closed]

There is an electric scooter, you need to increase the power by at least 10%, because with my light weight, it stops already when you raise 10 degrees. And I'm sure this is not the maximum that he is ...
imba Agency's user avatar
0 votes
2 answers
403 views

Brushless DC motor steady-state performance modeling

For a brushed DC motor, there are the well-known differential equations describing the electrical and mechanical behaviour: \$V_a-i_aR_a-L_a\frac{d}{dt}i_a-k_e\omega_a=0\$ \$k_ti_a-J\frac{d}{dt}\...
JZYL's user avatar
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How to improve the performance of subwoofer made with a TDA2030?

I have built a subwoofer amplifier with the IC TDA2030, it works well with my 8Ohm 30W woofer. How can I increase the bass? It is not much as expected, is it possible to improve the bass by ...
Sumithran's user avatar
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1 answer
174 views

Can wax really improve the performance of a FM transmitter?

Why would the use of wax improve the performance of a FM transmitter? Consider this from the video How to build a FM radio transmitter, at 4 min 14 secs: "Theoretically this helps decrease onboard ...
Peter Mortensen's user avatar
1 vote
1 answer
78 views

Is qNaN easier than trapping on overflow?

According to James Demmel's article, "Faster Numerical Algorithms via Exception Handling", IEEE Trans. on Computers 43 (1994), 983-992, the way a floating-point processor handles overflow can be ...
rwallace's user avatar
  • 559
0 votes
4 answers
735 views

BLDC Motor Performance at high altitude?

How does a BLDC motor performance change at high altitude where the air density is really low? For example, say I have a given BLDC motor with given torque-RPM performance curves. Now, I assume these ...
dumbpropnerd's user avatar
1 vote
0 answers
212 views

Is there a theoretical performance limit for Lithium Ion batteries?

Is there a theoretical performance limit for Lithium Ion batteries? I'd like to compare energy density of Petroleum Products based upon what limits can be obtained from stored energy in Lithium Ion. I'...
ffejrekaburb's user avatar
0 votes
2 answers
62 views

What is meant by process "performance"?

I am reading the product page for TSMC's 20nm process. It states Compared to its 28nm node, the 20nm process provides 15% better performance and can reduce total power consumption by a third. What ...
Randomblue's user avatar
0 votes
1 answer
160 views

How to test an RF crystal oscillator performance integrated into a Cellular radio?

I have a couple of reference designs with 2 different crystal oscillators integrated into it. These are cellular radio and can generate standard LTE QAM signals out of it. But I do not have access to ...
eecs's user avatar
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-4 votes
1 answer
78 views

Does building a RAM with more storage lead to decrease in performance? [closed]

Talking about Single channel DDR Ram, If say one RAM module were 4 GB, another 8GB. Is there any performance difference between those two?
Recoder's user avatar
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1 vote
2 answers
1k views

CPU register count and access time [closed]

It has been suggested that one of the reasons typical RISC CPUs stop at 32 architectural integer registers, despite a 32-bit instruction having enough spare bits to specify 64, is that a larger ...
rwallace's user avatar
  • 559
-1 votes
1 answer
379 views

Is it Possible to Design an Entire Operating System or App using ASIC Chips? [closed]

ASIC chips are hundreds of times faster than traditional chips. Is it possible to design an entire operating system or application using a full custom ASIC chip? Based on what I've read I understand ...
David Lynch's user avatar
5 votes
1 answer
2k views

Multiple Transistors (FinFET) sharing a gate?

Transistors are among the most fundamental components of electronic devices, and that to produce transistors with better performance, FinFET transistors have been developed: This allows for better ...
Kentastophe's user avatar
3 votes
1 answer
2k views

What is the difference in performance of a JFET current source to a 741 Op Amp current source?

It is possible to build a circuit that provides a steady current source via these two methods: Screenshot of op amp circuit Screenshot of self-biasing JFET current source In the circuit using an op ...
whatwhatwhat's user avatar
0 votes
1 answer
288 views

Health index / performance curve of a motor

I am collecting daily data of motors that consists of vibration in three direction x,y,z , RPM, Temperature, kVAh, kWh, kVArh, average voltage (LL), average voltage (LN), average PF, average current ...
dhinar1991's user avatar
0 votes
3 answers
306 views

Effect of temperature on Radio Components

Just starting to gain understanding on how various Radio components work (PA, LNA, LO, Mixer, etc.). Every component has ratings from the component manufacturer. I am curious to know, what effect we ...
eecs's user avatar
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1 vote
1 answer
9k views

Phase Cut to Control Speed of AC Induction Motor with Arduino

simulate this circuit – Schematic created using CircuitLab So I'm trying to speed controlling a single phase AC Induction Motor(For Fan). And I am trying to use phase cutting to control it. So ...
Naufal B's user avatar
-1 votes
3 answers
138 views

Physical explanation for currents being inversely proportional in transformer windings [closed]

Okay, so we all know that P=V*I, so in a step-up transformer the secondary windings will carry less current and still have higher voltage. The formula explains it conveniently. That does not make me ...
stevie's user avatar
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-1 votes
1 answer
423 views

Comparison between the performance parameters of Tristate buffer and Schmitt Trigger

I want to know the comparison between the performance parameters of Tristate buffer and Schmitt Trigger. By performance parameters, I mean things like propagation delay,power consumption etc. Thank ...
Tahseen Adit's user avatar
0 votes
1 answer
597 views

How do I benchmark and compare Simulink models when it comes to resources usage and performance?

I am trying to implement a model with different levels of complexity in Matlab Simulink. I would like to perform a comparison between the different models in terms of computational cost, resource ...
TheCake90's user avatar
2 votes
2 answers
5k views

Does a colder CPU perform better?

Are there any perks in keeping a CPU at a low temperature; between 0 and 20 degrees Celsius in particular? In particular, does it produce less errors in computation and therefore slightly improved ...
alainsanguinetti's user avatar
4 votes
1 answer
2k views

How do you know if a vacuum tube is going to suffer from AC hum or not?

I know that technically there is little difference between AC or DC heating of the tube - if it gives proper voltage everything is fine... Except the hum: I have read in various sources that some ...
Giedrius's user avatar
  • 365
0 votes
1 answer
581 views

Are there any alternatives to ASIC chips? [closed]

Are there any other mixed-signal integrated circuit embedded systems (or alternative solutions) which are faster than ASIC in terms of performance (let say for a high-efficiency Bitcoin miner)?
kenorb's user avatar
  • 107
1 vote
0 answers
888 views

Broadcast traffic issue in PLC Ethernet network

The setting: network with about 10 PCs and 8 AB RSLogix 5000 PLCs. The issue: Everything is communicating OK, but I'm seeing what appears to be a lot of broadcast traffic within the network. It is ...
Ryan Griggs's user avatar
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2 votes
1 answer
1k views

GFlops for IBM Power8 processor

What is the number of GFlops per cpu cycle for IBM Power8? Flops per cpu cycle is obtained as ( number of double precision floating point numbers fitting into one vector processing unit (if any) ) * ...
kiriloff's user avatar
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1 vote
1 answer
2k views

calculate clock cycle of ripple Carry and lookahead adder

How would you find the number of clock cycles it takes to produce sum, the carry out, and overflow flag using ripple carry or lookahead adder. Can someone please explain me how would we go on finding ...
Abhi's user avatar
  • 115
0 votes
2 answers
207 views

Improving memcpy performance on 8051

I have a routine for SHA-1 on a few bytes of input that takes 17ms to complete on a 8051-based core (running at 32Mhz). It calls memcpy once but it seems to be the ...
John M.'s user avatar
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0 votes
1 answer
323 views

Beginner level : Bit error rate trend

Please correct me where wrong and I would really appreciate intuitive explanation for the following fundamental questions. These may appear trivial but as I am not from Electrical background, these ...
Ria George's user avatar
0 votes
1 answer
96 views

What is the diffrences between Bitwise operations in terms of memory consumption, performance?

If I have two input, for example: a= 0110 b = 1010 which one is better (in terms of memory consumption, performance): x = a (XOR) b x = a (AND) b x = a (OR) b And why?
SHdotCom's user avatar
2 votes
2 answers
2k views

Why do I need a page directory?

I've found that image: and cannot find a reason why there is page directory ? I think that it could save time, if the process (or processes), especially the CR3 ...
Jorgos's user avatar
  • 409
1 vote
1 answer
765 views

Preamplifier before latch stage in comparator circuit

Adding preamplifier based on simple inverter before latch stage can improve performance of comparator by decreasing offset voltage. Can anybody explain me how it works? Best Regards
VIPPER's user avatar
  • 356