Questions tagged [performance]

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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 ...
2
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1answer
86 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 not ...
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0answers
33 views

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 ...
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0answers
100 views

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 ...
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0answers
37 views

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 ...
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3answers
115 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 ...
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1answer
73 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
22 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 ...
0
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1answer
65 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
57 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
61 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 ...
0
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2answers
165 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
112 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
57 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
353 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
180 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
52 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
86 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
984 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
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1answer
323 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
880 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
1k 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
170 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
124 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
72 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
259 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
264 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
3k 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
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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
439 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
637 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
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1answer
892 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
166 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
289 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
626 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 [closed]

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
281 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
230 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
422 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
914 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 ...