REGISTER | LOGIN
Home    Bloggers    Blogs    Article Archives    Messages    About Us   
Tw  |  Fb  |  In  |  Rss
Jonathan Harris
Latest Content
Page 1 / 2   >   >>
Experience is Quite a Teacher
Jonathan Harris  
3/20/2017   2 comments
How About Murphy’s Law?
Jonathan Harris  
1/23/2017   1 comment
Lit Up Like a Christmas Tree
Jonathan Harris  
12/29/2016   4 comments
Measuring LDO Load Regulation for a Novice
Jonathan Harris  
11/22/2016   Post a comment
In this installment of this series I’ll explain how to collect load regulation for an LDO.
Measuring LDO Line Regulation for a Novice
Jonathan Harris  
10/28/2016   Post a comment
A device going into space must be much more rigorously evaluated than a device going into a commercial product. Hence the need to do a good deal more characterization and ‘proving out’ of the device to make sure that it will endure the harsh environment in space as well as the long lifetimes required.
Measuring LDO Power Supply Rejection Ratio for a Novice
Jonathan Harris  
9/25/2016   2 comments
As somewhat of a continuation of my last blog topic I am once again returning to measurement of an LDO parameter as I look at the power supply rejection ratio (PSRR) of this device
Measuring LDO Noise Spectral Density for a Novice
Jonathan Harris  
8/25/2016   Post a comment
Characterize the noise spectral density (NSD) of an LDO, otherwise known as a low dropout voltage regulator.
Virtual Eval Through the Eyes of an ADC, Part 2
Jonathan Harris  
7/15/2016   Post a comment
Now that we’ve had a chance to learn a bit about the tool we will take a look at using Virtual Eval to predict the performance of the AD9680-500 which has integrated digital downconverters (DDCs) and will compare simulated data to measured data.
Virtual Eval Through the Eyes of an ADC
Jonathan Harris  
6/21/2016   2 comments
As I mentioned in my last blog I would like to take some time in this blog to introduce you to the new online simulator tool offered by Analog Devices called Virtual Eval.
IMS2016: Day 3 Review
Jonathan Harris  
5/27/2016   Post a comment
The IMS2016 IMS show has come to a close on its third and final day.
IMS2016: Day 2 Review
Jonathan Harris  
5/26/2016   Post a comment
. The day started off just a little slower than yesterday but quickly picked up pace and resulted in another day of steady booth and floor traffic. I had some great questions about the products we are displaying in my demonstration as well as many questions on our other technology on display at the IMS show.
IMS2016: Day 1 Review
Jonathan Harris  
5/25/2016   Post a comment
I hope that you had a chance to visit the IMS2016 show during the first day. There was a noticeable increase in floor and booth traffic compared to the show last year. Perhaps you all read my preview blog this week and decided to come and check out our great demonstrations at the Analog Devices booth!
IMS2016: Preview and Preparation
Jonathan Harris  
5/23/2016   Post a comment
Let’s discuss the preparation for IMS2016 and preview the show a bit.
ADC Digital Downconverter: A Complex Decimation Example Revisited
Jonathan Harris  
5/6/2016   Post a comment
In this installment I’d like to revisit the example that was covered in my January blog post
ADC Digital Downconverter: Decimation Filters and ADC Aliasing, Part 2
Jonathan Harris  
3/15/2016   4 comments
We will continue looking at the AD9680 as an example just as we did in part 1. Similar to the real mode operation of the DDC the normalized decimation filter responses are the same regardless of speed grade.
ADC Digital Downconverter: Decimation Filters and ADC Aliasing, Part 1
Jonathan Harris  
2/19/2016   2 comments
Let’s now take a closer look at the decimation filtering and how ADC aliasing influences the effective response of the decimation filtering
ADC Digital Downconverter: A Complex Decimation Example
Jonathan Harris  
1/15/2016   6 comments
Increase the decimation ratio in the DDC to see the effects of frequency folding and translating when a higher decimation rate is employed along with frequency tuning with the NCO.
Analog Devices Design Tools: Frequency Folding Tool, A ‘Complex’ Example
Jonathan Harris  
12/9/2015   Post a comment
Let’s now take a look at a real example with the AD9680-500. We’ll see how this simple yet powerful tool can be used to aid in understanding the aliasing effects of an ADC as well as help with understanding effects of some digital processing blocks in the AD9680.
Analog Devices Design Tools: Frequency Folding Tool Revisited
Jonathan Harris  
11/1/2015   Post a comment
Back in my April blog post this year, we took some time to look at the Frequency Folding Tool that is available on the Analog Devices web site. I would like to revisit this tool as there have been a few handy improvements that have been made based on some great feedback.
Analog Devices Design Tools: ADIsimRF Part 3
Jonathan Harris  
9/24/2015   2 comments
The ADIsimRF tool has many different calculation possibilities which are very nice to have on the hand. These can be useful when either in the lab collecting data or when working on a report in your office. The tool outputs are great to double check experimental results or to set expectations when about to take data.
Analog Devices Design Tools: ADIsimRF Part 2
Jonathan Harris  
8/18/2015   Post a comment
Before looking into the signal chain portion of the tool we began by looking at the calculator tool available in ADIsimRF.
Analog Devices Design Tools: ADIsimRF Part 1
Jonathan Harris  
7/19/2015   14 comments
The topic of this blog came up while at the IMS show and one of my colleagues mentioned that I should discuss the ADIsimRF tool as a part of the series. I thought this was a marvelous idea. I’ll have to precursor this discussion with the fact that I am actually an RF guy from my previous employment at an RF company which was my first position when I graduated from college.
IMS2015 Demo Details
Jonathan Harris  
6/3/2015   Post a comment
One of the questions that appeared on one of the IMS blog posts was about the details of the demonstration I had set up at the Analog Devices booth.
IMS2015 – Day 3: The Final and Shortest Day
Jonathan Harris  
5/22/2015   Post a comment
The last and final day of the show is usually has the most relaxed atmosphere and this year that proved to be the case once again. It is the shortest day of the show lasting from just 9:00 AM to 3:00 PM.
IMS2015 – Day 2: The Long Day
Jonathan Harris  
5/21/2015   2 comments
After having a pretty good first day of the show, I was looking forward to a good second day and it did not disappoint. The second day of the show on Wednesday is the longest day of the show as the exhibit hours go from 9:00 AM until 6:00 PM (day one is 9:00 AM to 5:00 PM and day three is 9:00 AM to 3:00 PM).
IMS2015 – Demo Setup and the First Day
Jonathan Harris  
5/21/2015   4 comments
The IMS2015 show is already off to a great start here in sunny Phoenix, Arizona and I hope that those of you attending are enjoying it so far.
IMS2015 – Pre-Show: The Preparation
Jonathan Harris  
5/18/2015   Post a comment
It sure doesn’t seem like it has already been a year since IMS2014! Well, technically, it hasn’t been since IMS2014 was in June last year. Once again this year IMS (International Microwave Symposium) is in a state known for its sunshine albeit this time sans the humidity. This year the show visits sunny Phoenix, Arizona.
Analog Devices Design Tools: ADISimADC Frequency Folding Tool
Jonathan Harris  
4/23/2015   2 comments
After looking at the performance metrics in the online ADC simulator tool it is a great time to look at another online ADC tool called the Frequency Folding Tool. It is a useful simulator that helps to understand the effects of aliasing in an ADC.
Analog Devices Design Tools: ADISimADC Performance Metrics
Jonathan Harris  
3/27/2015   Post a comment
. I received a very good reader question from my last blog post regarding the various parameters that are reported by the tool. Let’s take a look at an example and explore the parameters that are returned. In this example we will look at the AD9643-250.
Analog Devices Design Tools: ADISimADC Web-Based Simulation Tool
Jonathan Harris  
2/24/2015   2 comments
Now let’s look at the web-based evaluation tool. This does not require downloaded software to run as it is purely ran from the web
Analog Devices Design Tools: VisualAnalog Part 2
Jonathan Harris  
1/16/2015   Post a comment
First, to make any ADC operate we need to set up the input stimuli.
Analog Devices Design Tools: VisualAnalog
Jonathan Harris  
12/19/2014   4 comments
We begin this series of blogs by taking a look at ADIsimADC, which is a quite relevant design tool for Jonathan Harris, an applications engineer in ADI's high-speed ADC group.
Interfacing to ADCs: Power Supplies, Part 6
Jonathan Harris  
11/25/2014   15 comments
In this blog we’ll take this one step further and look at driving the ADC power supplies directly from a DC/DC converter.
Interfacing to ADCs: Power Supplies, Part 5
Jonathan Harris  
10/31/2014   2 comments
Previously in this blog series we looked at using a DC/DC converter (switching regulator) in combination with an LDO to drive the power supply inputs to an ADC. What we found was that using the DC/DC converter to step down the input voltage for the LDO was a much more efficient way to drive the power supply inputs to an ADC.
Interfacing to ADCs: Power Supplies, Part 4
Jonathan Harris  
10/2/2014   Post a comment
We look at using a DC/DC converter along with an LDO to drive the ADC power supply inputs.
Interfacing to ADCs: Power Supplies, Part 3
Jonathan Harris  
8/26/2014   16 comments
I thought it would be good to continue looking at the example I gave in my last blog where we looked using fewer LDOs and combining power supply rails on an ADC while maintaining isolation with ferrite beads.
Interfacing to ADCs: Power Supplies, Part 2
Jonathan Harris  
8/4/2014   4 comments
There are some disadvantages when driving low input supply voltages, where multiple LDOs may be required.
Interfacing to ADCs: Power Supplies, Part 1
Jonathan Harris  
7/7/2014   2 comments
Keeping the power supply inputs on separate domains can minimize crosstalk and make it much harder for noise to interfere with ADC performance.
IMS 2014 – Day 2 From an Applications Engineer Perspective
Jonathan Harris  
6/25/2014   15 comments
As is typically the case, at least from my observance in the last four years, the second day of the show proved to be the busiest.
IMS 2014: Day 3 From an Applications Engineer Perspective
Jonathan Harris  
6/25/2014   6 comments
After a good first two days and very enjoyable evenings of the IMS show, it was time for the last day, when traffic is typically good in the morning but tapers off as the day moves toward lunch and beyond.
IMS 2014: Day 1 From an Applications Engineer Perspective
Jonathan Harris  
6/24/2014   7 comments
After a very eventful preparation and buildup to the IMS show this year, I’ll have to admit I was hoping for a smooth and uneventful show -- meaning no surprises resulting in something going wrong in the demonstration booth.
IMS2014 – The Preparation
Jonathan Harris  
6/23/2014   5 comments
Once again I thought I'd do a series of blogs on my experiences as an applications engineer for a major semiconductor company, Analog Devices, at International Microwave Symposium (IMS).
ADC Power Supplies: Inputs
Jonathan Harris  
6/2/2014   4 comments
We’ll start by taking a look at the power supply inputs of the ADC, what we typically use to supply power to the ADC, and some of the tradeoffs of the different methods.
ADC Noise: The Clock Input & Phase Noise, Part 3 – Test Setup
Jonathan Harris  
4/18/2014   2 comments
As an engineer it is always rewarding when one can calculate an expected result and see the measurement in the lab line up with that calculation.
ADC Noise: The Clock Input & Phase Noise (Jitter), Part 2
Jonathan Harris  
2/27/2014   7 comments
In Part 1, our blogger looked at how many clocking products specify the phase noise of the device but don't specify jitter. In the second part, he offers a real-life example.
ADC Noise: The Clock Input & Phase Noise (Jitter), Part 1
Jonathan Harris  
2/18/2014   5 comments
Many clocking products specify the phase noise of the device but don't specify jitter. Let's take a look at how we can go from phase noise to jitter.
ADC Noise: How the Clock Input Can Help
Jonathan Harris  
1/24/2014   4 comments
One of the most critical areas on an ADC that can affect performance is clock noise. Good layout and routing techniques coupled with an optional filter can do wonders in improving key specs.
ADC Noise: More on the Analog Inputs
Jonathan Harris  
1/14/2014   5 comments
There are many ways in which noise can enter an ADC or signal distortion can occur. We look at some of these, including aliasing.
How Do You Analyze ADC Noise? Part 2
Jonathan Harris  
12/27/2013   5 comments
This time, let's look at the noise that can enter the ADC through its signal and common mode inputs. Then we'll go through a noise calculation to see how it's done.
Page 1 / 2   >   >>




latest blogs
Winters are getting shorter and temperatures are on the rise, and I think you’ll agree with me that overheating is never a good thing. Whether it’s human beings, equipment or pizza, you never want anything to be too hot.
flash poll
educational resources
 
follow Planet Analog on Twitter
Planet Analog Twitter Feed
like us on facebook
our partners
Planet Analog
About Us     Contact Us     Help     Register     Twitter     Facebook     RSS