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    DDR3 impedance matching

    Hello, As we are following 50Ohm impedance in single ended signals and 100Ohm impedance differential signals in routing. My question is in routing differential like Clock+ and Clock- we follow 100Ohm differential impedance. Is it necessary to follow 50Ohm for individual signals? Means we need...
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    [Moved]: HDMI surge protection

    Re: HDMI surge protection Hello FvM, Can i try by providing EARTH to HDMI connector???
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    [Moved]: HDMI surge protection

    Hello Guys, I am having issue in HDMI interface failure due to surge. Currently I am using ESD protection IC TPD12S016 from TI. but this is for only ESD protection and can not provide Surge protection. I also searched surge protection chip for HDMI but I can't find proper protector of HDMI. As...
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    PCB antenna for WIFI

    Hello Guys, I have read some docs to create wifi antenna on PBC itself. www.cypress.com/file/136236/download www.ti.com/lit/an/swra117d/swra117d.pdf How can I increase gain level in PCB antenna??? Regards, Dharit
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    SDIO 3.0 and SDIO 2.0

    Hello All, I am using AM3352 processor from TI make. It is having SDIO 2.0. My question is can I connect SDIO 3.0 device with my processor? SDIO 3.0 can communicate with SDIO 2.0? I found basic difference is speed for SDIO 2.0 and SDIO 3.0. I dont know whether SDIO 3.0 is backward...
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    Decoupling and bulk capacitor

    Hello KlausST, Agreed, on your answer. I am terminating Cap to GND plane and another terminal is connected to Vcc pin of IC by trace. If I am not wrong ultimately inductance created by trace between cap and IC pin is going to create issue. I want to know about that distance. How much is...
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    Decoupling and bulk capacitor

    Hello Guys, All says that Decoupling and bulk capacitors must be placed near to IC pin or beside of IC pin. But it is not possible to put it all the time. Placement and value of cap is dependent on current consumption of IC obviously. But how far is good enough for capacitor placement???
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    CRYSTAL internal resistance

    Hello c_mitra, Yes, The crystal with higher ESR (80 ohm) is working fine with the processor which recommends 30 ohm ESR crystal. My question is if I use crystal with 80 ohm ESR will it going to create any problems in future???
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    CRYSTAL internal resistance

    Hello All, I am designing a system in which I am using PHY IC with required Crystal with ESR value of 30 ohm (max). The crystal which I have is with ESR of 80ohm, Is there any method to meet the requirement of 30ohm? How to make Crystal ESR 30 ohm from 80 ohm??? PHY IC:RTL8211EG
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    Capacitor life calculation

    ok... So basically ESR is there behind increasing temperature... So what should be recommended ESR if we are using Ele Cap for power supply design??? Can anyone suggest me capacitor selection guidelines...
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    Capacitor life calculation

    Hello Guys, I was checking for capacitor life... How long it can run... I found calculator for measuring life. In general we are mostly using electrolyte and ceramic caps usually in routine Basic Electronic circuits. https://www.illinoiscapacitor.com/tech-center/life-calculators.aspx I...
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    [SOLVED] Increase LF antenna range

    Hello FVM, Yes, you are correct. I am making RFID LF antenna for 125KHz. I have made coil antenna in square shape. Its size is 35mmX25mm. Its with 900uH inductance and 21Ohm resistance. Once I tried with increasing antenna dimensions with same Inductance(900uH) and resistance(21Ohms). At that...
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    RFID antenna, range, frequency and Q factor

    Hello Guys, How to calculate resonant frequency for RFID? How inductor and capacitor values are set? How Q factor affects antenna performance and RFID detection for card? For good performance of 125KHz LF and 13.56Mhz RF what should be the Q factor value? Please provide suggestion or document...
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    Contact resistance measurement

    Hello Guys, How to measure contact resistance practically??? Is there any impact on contact resistance if current increases??? What should be the acceptable value for contact resistance if we are looking for connectors??? Thanks...
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    High speed vs High clock signal

    Hello Everyone, Is there any difference between High clock signal and high speed signal??? On what basis signal is said to be high speed??? On frequency??? or as per rise time or fall time??? Data transfer???
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    [SOLVED] Radiation issue on one frequency

    Hello Guys, In my board I am facing issue of radiation emission of particular 74.25MHz frequency harmonics of 7th number and getting maximum radiation on 520Mhz. Trace length is about 2168 mils and having ground plane on second layer. I have tried by putting RC filter as well putting bead also...
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    sim900 not detecting sim card

    It seems that something is making your SIM VCC signal forcefully low. It should give 1.8V or 3V as per sim card support. While detecting SIM hardware first GSM engine gives 1.8V Voltage cycle if it is supported by sim then it will work. If SIM dont support 1.8V then GSM engine try 3V cycle to...
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    Firmware programming in controller

    Hello Guys, This question I had from few past days. While we program any controller we write codes and burns it in controller. How exactly that code transfers into hardware inside the controller??? If I write 1 in any GPIO pin at that time we can get some positive voltage level on controller...
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    SGMII/SerDes interface

    My query is where should be placement of ac coupling capacitor in sgmii interface on PCB??? What should be the value of ac coupling capacitor???
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    [moved] [TXD and RXD state (0 or 1) in RS485 and RS232 in initial condition

    My query is what should be TxD and RxD signals initial state in communication. Means is there any defined standard which state that in initial state RxD should be pulled high or TxD should have low level??? Query is for both RS232 and RS485 stds.

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