Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [performance]

The tag has no usage guidance.

0
votes
0answers
50 views

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 ...
0
votes
1answer
102 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 ...
1
vote
1answer
41 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 ...
0
votes
4answers
136 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 ...
1
vote
0answers
139 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'...
0
votes
2answers
47 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 ...
0
votes
1answer
52 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 ...
-4
votes
1answer
75 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?
1
vote
2answers
363 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 ...
-1
votes
1answer
275 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 ...
4
votes
1answer
549 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 ...
2
votes
1answer
560 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 ...
0
votes
1answer
112 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 ...
0
votes
3answers
79 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 ...
1
vote
1answer
5k 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 ...
-1
votes
3answers
70 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 ...
-1
votes
1answer
188 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 ...
0
votes
1answer
160 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 ...
0
votes
2answers
1k 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 ...
4
votes
1answer
884 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 ...
0
votes
1answer
397 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)?
1
vote
0answers
482 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 ...
2
votes
1answer
794 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) ) * ...
1
vote
1answer
786 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 ...
0
votes
2answers
142 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 ...
0
votes
1answer
242 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 ...
0
votes
1answer
81 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?
2
votes
2answers
1k 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 ...
1
vote
1answer
545 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
-2
votes
2answers
1k views

How to determine calculation performance of an FPGA from datasheet?

If you have a processor, you can look at the amount of GFLOPS to know something about the FLoating-point Operations Per Second, but how do can you say something about the performance of an FPGA, when ...
1
vote
3answers
1k views

PCI-Express and FPGA Development Boards

I'm interested in using some high-performance FPGA development boards, but it seems like most of the high-end, modern options from both Xilinx (Digilent) and Altera (Terasic) seem to be PCIe-based ...
2
votes
3answers
1k views

Very bad performance with PIC32

I am encountering a problem with very bad performance in my PIC32 code. For example, I have this ISR which is servicing a few different interrupt sources: ...
0
votes
1answer
265 views

Can a linear motor output multiple and precise linear forces?

I am trying to identify a motor-driven system that can produce a constant linear force in one direction. The context for this is an injection device that compresses the plunger of a syringe (...
1
vote
1answer
13k views

CPU Execution Time / Performance

I'm trying to solve a question concerning performance. I have the final answer (24 * 10^9)but I can't determine how to get there. I know the formula for performance is Execution time: CPI * I * 1/...
2
votes
0answers
190 views

What should I do with the unused diode in the SOT-323-3 (SC-70-3) package?

I'm planning to use one of this diode in my circuit. But the package contains two of them. I chose it mainly because of its 3ns reverse recovery time. How do I use them in my circuit? I have three ...
4
votes
1answer
390 views

Explanation of performance graph of FPGA design

After implementing a mathematical function on a FPGA chip. The following graph shows for ~40 inputs the time response, i.e. how long it took to get the output calculated. This data is part of the ...
6
votes
5answers
1k views

Which parameters in datasheet give information about a BJT's step response quality?

I did a test with randomly chosen 12 NPN BJTs. I applied a clock pulse to each of them and observed their collector voltages. Some of them showed very low rise time, while some responded terribly slow....
0
votes
1answer
867 views

Better device than a LM 298

Building a robot that will run on 12V. Using four DC motors and basing my design around an older robot that has been around my school for many years. It uses the LM 298 H-bridge for motor control. I ...
6
votes
1answer
608 views

Why does splitting a FPGA critical path work to improve performance?

Context I am currently reading the (very good) course material on "Introducing the Spartan 3E FPGA and VHDL" promoted here (community ads) and I don't really get the idea of splitting a critical path ...
1
vote
1answer
3k views

ARM9 vs ARM11 performance? [closed]

This may be a loaded question, but is there a general understanding of the performance increase per clock between ARM9 and ARM11? Say, for a math-heavy function (FFT)? Thanks!
1
vote
1answer
422 views

What is the fastest I/O planning for FPGA?

There are many timing strategies that can improve FPGA speed ( as Timing constraints , planning the clock regions ,....). One of these strategies is selecting optimal places for I/O pins and ...
3
votes
2answers
2k views

Advantages of a Gray code in 16-QAM

I'm looking at a system using a gray code on 16-QAM. When a symbol changes, you move from one of the 16 symbols in the constellation to any of the 16 symbols. I'm wondering if there is in fact an ...
4
votes
3answers
6k views

AVR ADC performance: interrupts vs. manual conversion

I have a device on ATMega16 microcontroller that is supposed to constantly send ADC measurement results over USART. The controller is operating at 16MHz with an external crystal and ADC prescaler is ...
15
votes
8answers
4k views

Microcontroller/cpu for fast trigonometry in robot?

This concerns hardware that does weighs little, because a (fat cat sized, 6 legs with 3 DOF) walking robot should carry it around. Because of that walking it'll need to do a lot of trigonometry (using ...
19
votes
2answers
5k views

How do microcontrollers achieve > 1 MIPS/MHz performance?

Like this one, which does 1.49 DMIPS/MHz. Even with pipelining there's still only 1 execute stage per cycle isn't it?
2
votes
4answers
9k views

Improving throughput of a Bluetooth Low Energy Connection

Follow-Up question from Stackoverflow I am trying to write a characteristic value repeatedly over a short amount of time. Different sources tell that rates between 200 and 305 kbit / s should be ...
12
votes
2answers
3k views

Does using only NAND/NOR gates increase circuit delay?

I remember learning in school that one can construct any logical circuit from solely NAND or NOR gates. First of all, I am ...
13
votes
5answers
32k views

Arduino: faster alternatives to digitalread() and digitalwrite()?

What are the fastest alternatives to calling the Arduino functions digitalread() and digitalwrite()? AVR-specific or chip-...
1
vote
1answer
1k views

Simulating Multiple Feedback Low Pass filter using LTSPICE

I am trying to simulate the follwoing circuit in LTSpice IV. What I am looking for is overall performance in frequency domain. I downloaded and readed a lot of LTSpice guides, but none of them were ...
10
votes
2answers
10k views

How does a Cortex M0 perform compared to 8-bit controllers?

This document cites 60 DMIPS/mW for a Cortex M0, vs 31 DMIPS/mW for an M3. (The latter doesn't agree with the numbers in this document, which cite 1.25 DMIPS/MHz and 0.19 mW/MHz, giving 6.6 DMIPS/mW.) ...