Analog Signal Chain real world problem solutions: Technology and Tools
    • Dec 22, 2016

    Do you always need a LDO in front of your data converter?

    Figure 1: SNR of the ADS5407 powered by LDOs or DC/DCs Can you tell the difference in the signal-to-noise (SNR) ratio shown in Figure 1? Neither can the ADS5407 12-bit analog-to-digital converter (ADC). Both the low-dropout (LDO) linear regulators and the step-down (buck) DC/DC converters give the same data converter noise performance. How is noise...
    • Dec 13, 2016

    Inductive sensing: make your proximity-switch applications as easy as 1, 2, 3 with WEBENCH

    When customers are designing proximity-switch applications using inductive sensing devices like the LDC0851 switch, they often ask me how to design a coil for a given switching distance. Today, I want to show you how to use TI’s new WEBENCH®...
    • Dec 8, 2016

    What you need to know about input bias current – and why

    One of my standard interview questions for new college graduates is to describe the non-ideal aspects of an operational amplifier (op amp ). While most candidates start with open-loop gain, offset voltage, bandwidth and noise, only a few mention input bias current. Even experienced circuit designers often have questions about input bias current and...
    • Dec 5, 2016

    How switching above the AM band eases automotive Class-D amplifier EMC designs

    As I recall riding in my dad’s 1957 Chevy, every time he would change the radio to a new station in the AM band, I could hear a lot of static. This loud buzzing sound represents noise from the car’s alternator or ignition system, which ei...
    • Dec 1, 2016

    How to correct 10Gbps performance issues with a USB Type-C™ active redriver multiplexer

    With today’s 4K ultra high-definition (UHD) TVs (and future 8K UHD TVs), as well as solid-state storage speeds, more video and data bandwidth is a must. Interface standards groups in the industry are addressing this trend by enabling more video and data bandwidth. For example, the Video Electronics Standards Association (VESA) DisplayPort 1.4...
    • Nov 29, 2016

    How you can use the LDC racetrack inductor designer tool

    In my previous post, I introduced the LDC calculator tool, which you can download here . It can calculate a number of useful parameters for an Inductive Sensing application. LDC devices use inductors to sense the movement of conductive targets. At TI, we commonly use spiral traces routed on a printed circuit board (PCB) to form sensing inductors...
    • Nov 28, 2016

    Why phase noise matters in RF sampling converters

    ** This is the 16th post in an Analog Wire RF sampling blog series . ** Radio frequency (RF) sampling data converters support very wide signal bandwidths and a variety of modulation schemes. The clocking performance for the RF sampling data converter is very important. I previously discussed the importance of the sampling clock and the implications...
    • Nov 24, 2016

    Intro to I2C: what the Internet doesn’t tell you

    I trust Internet search engines as my first source to provide me with reliable and quick answers, so when I first encountered the I 2 C protocol , I asked my trusted-source to help out. My search responded with: the Inter-Integrated Circuit (I 2 C) protocol is a bi-directional two-wire serial bus that provides a communication link between integrated...
    • Nov 22, 2016

    A survival guide to scaling your PLL loop filter design

    Let’s say that you have already spent some time optimizing your phase-locked loop (PLL) by iteratively massaging the phase margin and loop bandwidth. Unfortunately, you may still be unable to get a good compromise between phase noise, spurs and lock time. Frustrated? Ready to give up? Wait! Have you ever played around with the gamma optimization...
    • Nov 21, 2016

    USB Type-C™: Will your ESD solution protect the port?

    If you are a designer tasked with migrating the USB ports in your system to the latest USB standard and USB Type-C connector , you have likely already considered a couple of things. ESD protection First, as with all systems where a connector is exposed externally to users, your system would need to have International Electrotechnical Commission...