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Questions tagged [high-speed]

High-speed design deals with designing circuits which are working at high frequencies where side-effects like path inductance gain significant influence.

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2000rpm with 5kg-cm torque [on hold]

I need to make a lift system which raises and lowers about 2-3kg load as fast as possible and switch the direction every 2-3 seconds. Ideally, 2 m/s speed is very good. But for my prototype, 1m/s is ...
2
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1answer
66 views

Change in duty cycle of a transistor (BJT)

simulate this circuit – Schematic created using CircuitLab I have recently been working on a project in which my requirement is to transmit the data through a transistor, at a typical speed of ...
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2answers
418 views

Question relative to pads for capacitors - high frequency

In the article Compact sub nano second pulse generator using avalanche transistors, I read P. 874 Further, we used pads on a doublesided 0.062” FR-4 epoxy glass laminate pc-board for ...
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18 views

Lumped vs Distributed System when connecting to Cables

I am currently working on a project where I have a microcontroller that is talking to a SPI to UART IC and then that IC is talking to a UART to RS-485 IC. This is then connected to a 120 ohm ...
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0answers
61 views

Meeting Setup/Hold Time according to time analysis

I am trying to interface an IC with an FPGA. Both the IC & FPGA run at 66 MHz with no clock skew between them and the propagation delay of the data lines is negligible, since the length of the PCB ...
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0answers
16 views

stub vs via coupling in ddr4

I am currently designing a board which integrates FPGA Kintex Ultrascale from Xilinx and a 64-bit memory DDR4 at 2400MTps. Xilinx has a document, UG583, which provides a lot of information about DDR ...
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0answers
21 views

Transceiver IC SN74LV245A at different voltage levels pull up resistor require for current improvement

I've gone through datasheet of IC Page number 12 Figure 5 shows typical application of IC which is 5 to 3.3V compatibility. In my design My sensor Output is 1.5V to 2.2V so we're planning to have ...
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0answers
68 views

PCB HDMI high speed routing suggestions on my layout

I would like to get suggestions from all the high speed PCB layout experts on my PCB design. I have a board with HDMI transmitter IC whose output is going to HDMI switch IC. The switch IC also has ...
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1answer
194 views

High voltage nanosecond pulse generator

I am trying to build a PCB based pulse generator that can produce a pulse with a width of about 100 ns and 500V-1000V peak amplitude to a 50 ohm resistive load. I will use the circuit for burst pulse ...
2
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2answers
129 views

Are there special rules for voltage division of a high speed clock?

High speed signals require special care in PCB layout to prevent high speed effects like ringing and overshoot. This obviously applies to clock signals as well. Provided that one has a high voltage ...
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1answer
47 views

Paralleling LVPECL outputs?

I have a pretty unusual application here, where I need to drive a fast differential signal fanning out into 8+ 100ohm transmission lines. The unusual part is this: the transmission lines must be ...
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1answer
64 views

noise of high speed serial link

I have an ADC module. The board contains sensitive (10-100MHz) analogue parts and a high speed serial link (Aurora). The link uses scrambling algorithm, and I can choose the bit-rate. (I have much ...
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35 views

Guidance for designing an experiment (high speed design)

so for a project I want to investigate simultaneous switching noise and how it cause changes in the source and ground voltage. I've been reading the High speed digital design book by johnson and ...
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1answer
54 views

what is simultaneous switching output noise?

Can someone explain to me what simultaneous switching output noise is (SSO) is it the same thing as simultaneous switching noise (SSN)? from what I understand when lots of pins are switching together ...
0
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1answer
70 views

PCB 6-layer stackup trace reference

I am designing a 6-layer board, with stackup like this: 1-TOP slow North/South 2-GND 3-Signal high speed East/West 4-Signal high speed North/South 5-VDD 6-Bottom slow East/West PCB plane spacing is: ...
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3answers
110 views

High voltage to low voltage in ps/nanosecond time (Zener/opamp?)

So I have a signal that goes from 0 to ~800volts in 30ns. I would like to use this signal to trigger a camera (input impedance of 50ohm) which takes a max of 10 volts and requires the rise time to be ...
14
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4answers
293 views

Do chips really need multiple values of decoupling capacitor in the same packages?

A similar question is asked here: "two bypass/decoupling capacitors" rule? But that question was about parallel bypass capacitors without mentioning package size (but the answers mostly ...
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1answer
55 views

How would I go about measuring an analog signal that has both positive and negative voltages on an arduino analog pin at a high sampling rate?

I have a signal that fluctuates between -70mV and 50mV. How would I get the arduino mega to read this on an analog pin at a high sampling rate? Ultimately I am trying to graph the data in real time so ...
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0answers
60 views

Problem with signal edge in schematics containing high speed IC switch

I am trying to design the following schematics: There are two kOhms resistance which are connected serially. One is load and another is device resistance. I need to apply the voltage in a the ...
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1answer
411 views

Does the motor speed change with the fully automatic star(wye)/delta starter?

At no load, I connected a 380V motor to start in the star connection for 5 seconds and thereafter change to the delta connection. I understand that torque will change since the current will change as ...
8
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4answers
2k views

Understanding the Maximum Speed that can be Transmitted over a Cable

I am trying to source a FFC/FPC cable for USB3.0 (+5gbps). This brought me to the question of signal transmission. I'm somewhat of a beginner in this topic. I know that you should match impedance on ...
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2answers
125 views

PCB - matching length - relevant in that case?

I am trying to design PCB with 85 MHz signal traces between IC and connector (the FPGA board will be connected to this connector). This connection contains 28 data signals and one clock signal. I ...
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2answers
126 views

High Speed Signal on Large Circular Ring

It's frequently communicated that when working with signals in the Ghz range, routing is extremely important to signal integrity. Pretty much any inclusion of unnecessary stubs is out of the question, ...
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2answers
121 views

High Bandwidth, High Voltage differential amplifier problems

I inherited a opamp measurement circuit that is supposed to be able to measure differential voltages of up to 1000 V with a bandwidth of 1 MHz and a protective impedance between the HV and SELV side. ...
2
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2answers
164 views

Best board-to-board low latency protocol/interface

I've been asking similar question which received some downvotes, so I'm reformulating my task (hopes this one gives more clarity). I'm planning to establish a high-speed (3 Gpbs full duplex) serial ...
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2answers
370 views

Bootstrapped Transimpedance Amplifier (TIA) - High Frequency Instability

I have constructed transimpedance amplifier in the hopes to achieve both high-gain (5kΩ) and high-bandwidth (50MHz) performance using the FGA21 photodiode, the OPA657 Op-Amp and the 2N2369 Transistor. ...
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1answer
79 views

USB Diff Pair used by 2 devices on PCB

My PMIC uses the DP/DN pair of USB type C to get the maximum current that it can draw to power up the circuit or charge the battery. The problem is that i don't have a hub and the signal from ...
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2answers
143 views

Is this LED slow, or am I measuring it incorrectly?

I am attempting to turn white light LEDs on and off at a very high speed. Here is a link to the LED being used. https://www.superbrightleds.com/moreinfo/through-hole/5mm-white-led-75-degree-viewing-...
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1answer
196 views

How does my crystal PCB layout look?

Please suggest if the layout is fine: it is 25MHz 3225 crystal. I maintained short traced for XIN and XOUT. I maintained a guard ring around the crystal. I have grounding in layer just below. the ...
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2answers
338 views

DDR3 SE signal, is 50Ohm impedance necessary?

I want to design a 6 layer PCB for an Allwinner H3 and DDR3, but the PCB workshop just have the stack-up shown in the image. With this stack-up, The calculation for striplines impedance is difficult. ...
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1answer
101 views

Which is better, less crosstalk or less skew?

I'm designing a board that has a LVDS 2.5V interface with 30 lanes clocked at 600MHz and DDR. This is going from one chip to another chip which could be placed right next to it, there are no other ...
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1answer
63 views

Jitter measurement in High speed serial link - Random jitter mean not 0

I made some jitter measurements of my high speed serial link yesterday. Now i'm analysing the jitter sources, and found out, my random jitter is often not around zero, most time about -1 .. -0.5ps. ...
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2answers
362 views

Gigabit Ethernet switch unused RGMII/MII/RMII interface

I am working on 5-port gigabit Ethernet switch based on Microchip KSZ9897. As the KSZ9897 is 7-port gigabit Ethernet switch (5 x 1000BASE-T/100BASE-TX/10BASE-Te IEEE 802.3 + 2 x RGMII/MII/RMI) and I ...
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2answers
323 views

USB 2.0 data lines swap suggestion

I need your advice regarding the USB 2.0 signals routing. When I reach the USB connectors, the data lines (D+ and D-) have to be swapped. I have two options there: 1) swap the lines using vias and go ...
2
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2answers
82 views

High-Speed electronics - Reflections in T-intersection

I'm currently attending a course on "experimental problem solving" and we just started talking about TDR (time domain reflectometry). I do understand that reflections occur whenever there is a change ...
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1answer
74 views

Multi-layer layout and return currents of high-speed signals

I am planning to use the following layer stackup for my 10-layer PCB: ...
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1answer
557 views

Why are most IR phototransistors slow?

Most NPN silicon phototransistors that I see (Everlight, Kingbright, etc.) have fairly poor rise and fall times, on the order of 10us. The best one I've seen so far is the QT Brightek QSD8T120B with ...
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2answers
1k views

RF PCB Design Basics - RF traces golden surroundings

In the answers to my previous question "RF Design Basics", there are explanations about the purpose of a golden ring around the PCB edge and around some parts (functional blocks) within the PCB. ...
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4answers
817 views

RF PCB Design Basics

I want to get some knowledge in RF PCB design. Therefore I have some questions about this, in order to make some clarification. What is the purpose of the golden ring around the PCB, often seen on RF ...
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1answer
159 views

Is there a rule for DDR4 CA signals reference plane?

I'd like to know if there is any rule for the reference plane of DDR4 CA signals in PCB layout. I saw some design guide which specify the reference plane to be VDDQ power plane for CA signals, but I'm ...
7
votes
1answer
223 views

USB 3.1 over PCIe board edge connector

I am designing a system with a carrier board that has all of active logic on one board and most connectors on a backplane board. The interface between the two boards is a x16 PCIe board edge connector....
1
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1answer
232 views

SiPM Array, High Speed Layout

I'm working on an prototype array of Silicon Photomultipliers using the Sensl MicroFJ-60035 TSV device. It's a small 6 mm by 6 mm square-shaped BGA photomultiplier. Think of a 6x6 BGA array with the ...
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2answers
819 views

high speed microcontroller - pc communication

I have a project where I have to sample a 4 bit bus every 100ns continuously for a data logging application (I need very low sampling jitter as well). I have a uC that can go up to 300MHz so speed isn'...
0
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1answer
81 views

HDMI Adaptor Board - Blank Screen [not working]

I have a Raspberry Pi and a custom HDMI screen board stacked as shown in the photo here. If I use a 'standard' HDMI lead then I have no problem. However, due to the form factor a lead does not suit ...
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3answers
243 views

Increasing Speed of Bootstrapped Amplifier

I am trying to implement the design described here to create an amplifier circuit that will amplify a 10MHz, 24Vpp signal to 120Vpp. I am using the THS3062 op-amp, and originally I was looking at ...
3
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3answers
248 views

Series Termination Resistors Sharing a Common Point

Suppose I have a high speed digital signal (represented as a square wave) that splits off and is shared between two subsequent inputs stages (represented as MOSFETs). Is it better to have two series ...
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1answer
605 views

AC coupling caps on USB interface [duplicate]

Does anyone know why AC coupling caps should be implemented in USB3 interface while it's not required in USB1/2? Anything to do with transmition speed, encode method?
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1answer
83 views

High speed IR connection [closed]

Are there any IR receivers/transmitters with speed higher then 4Mbps? As I found most parts are limited to 4Mbps, like LT1328 (photodiode receiver) and TFBS6711 (infrared transceiver)
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0answers
212 views

High speed, TTL compatible, high-side switch IC

I like full integrated automotive high-side switches, such as the ISP452. I like them because of their simplicity, making extremely easy driving grounded loads at standard voltages (12V or 24V) with ...
11
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3answers
1k views

More Vdd than Vss Pins

I am currently working on my first microcontroller hardware design; I had a microcontroller class in college, but it focused on the software side of things, and used a pre-made development board (for ...