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 boards a number times shows it takes an average of 2.5 seconds to erase a single block (command 0xD8) or sector (command 0x20). Is this normal? Once a block is … Read more

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 concepts are quite baffling for me. It is preferred to have a low BER. Does the theoretical BER serves as the lower or the upper … Read more

Are there any alternatives to ASIC chips? [closed]

Closed. This question needs to be more focused. It is not currently accepting answers. Want to improve this question? Update the question so it focuses on one problem only by editing this post. Closed 6 years ago. Improve this question Are there any other mixed-signal integrated circuit embedded systems (or alternative solutions) which are faster … Read more

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 high end equipment which can demodulate the signal for vector measurements. So I am looking for ways to test … Read more

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 interference between the components” Wax in this case is paraffin wax and has a relatively low relative permittivity of 2-3 … Read more

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: Va−iaRa−Laddtia−keωa=0 ktia−Jddtωa−Bωa−TL=0 For my purpose, I’m interested in steady-state performance. I can solve for Va and ωa for a given input voltage by setting the derivative terms to zero. Brushless motors are more complicated in that it’s the … Read more

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

Closed. This question is off-topic. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Electrical Engineering Stack Exchange. Closed 2 years ago. Improve this question There is an electric scooter, you need to increase the power by at least 10%, because with my light weight, it … Read more

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

Closed. This question is opinion-based. It is not currently accepting answers. Want to improve this question? Update the question so it can be answered with facts and citations by editing this post. Closed 1 year ago. Improve this question After reading this excellent question, it seems that thermal issues are currently one of the largest … Read more

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. Answer None? I opened two random eMMC datasheets and they both do mention it. First : Random read/write 4866/1542 IOPS Second : Random read/write e.g. 2500/200 IOPS … Read more

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 (similar setup to this open source syringe pump). The actuation (injection) needs to be performed at a precise and repeatable force. I’m … Read more