Questions tagged [performance]

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71 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?...
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0answers
11 views

Unreadable flashdisk / ERROR and RAW format on Windows 10 [migrated]

I'm a newbie and I want to ask.. When I insert FD into my PC, it is illegible and always format. and FD in RAW format, when I format from CMD a notification like this occurs : when chkdsk / R F: ...
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0answers
21 views

How do I determine the parameters for a battery equivalent model?

I have these pieces of information of a battery from which I want to estimate the battery equivalent RC parameters. Let it be first order or second order. I have a performance curve detailing battery ...
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1answer
62 views

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 ...
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0answers
53 views

Setting gain on Improved Howland current source (best practice)

I understand that you can set the gain of an improved Howland by setting the the ratio of resistors \$R_2\$ and \$R_1\$ and/or the value of \$R_{\text{set}}\$. Is it better to leave the ratio of \$...
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1answer
46 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 ...
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2answers
134 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}\...
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0answers
2k 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 ...
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1answer
107 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 ...
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1answer
53 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 ...
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4answers
305 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 ...
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0answers
178 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'...
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2answers
50 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 ...
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1answer
71 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 ...
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1answer
76 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?
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2answers
827 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 ...
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1answer
305 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 ...
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1answer
779 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 ...
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1answer
926 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 ...
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1answer
163 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 ...
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3answers
114 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 ...
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1answer
7k 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 ...
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3answers
71 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 ...
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1answer
234 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 ...
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1answer
244 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 ...
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2answers
2k 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 ...
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1answer
1k 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 ...
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1answer
429 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)?
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0answers
589 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 ...
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1answer
870 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) ) * ...
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1answer
1k 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 ...
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2answers
162 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 ...
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1answer
282 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 ...
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1answer
87 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?
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2answers
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 ...
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1answer
619 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
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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 ...
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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 ...
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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: ...
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1answer
278 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 (...
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1answer
14k 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/...
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0answers
222 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 ...
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1answer
412 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 ...
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5answers
2k 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....
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1answer
911 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 ...
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1answer
615 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 ...
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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!
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1answer
480 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 ...
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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 ...
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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 ...