Author Archives: Poojan Wagh

My other blogs & plans for the future

By Poojan Wagh | Published: March 8, 2010
It used to be that I’d post just about anything here. However, after a few months of posting circuit design articles, I developed a consistent readership and decided that most of you aren’t interested in my daily life and/or the tech hobbies that I might be up to. As a result, I separated my personally-centered [...]
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Tunable Non-Foster Match Using Switched Capacitor

By Poojan Wagh | Published: February 16, 2010
What's even cooler about this reactance is that the Non-Foster region is determined by the switching frequency--so, one could move it around just by changing the switching frequency. You'd effectively have a digitally-tunable antenna.
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Median vs Mean

By Poojan Wagh | Published: December 22, 2009
I’ve been doing some statistical measurements lately (more to follow). It occurs to me that while most people measure the mean of a set of measurements, the median is more useful.
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CircuitDesign.Info: Site maintenance

By Poojan Wagh | Published: November 16, 2009
Some of you may have noticed that the site was down for a day last week. Expect a bit more down-time: I’m going to do a bit of experimentation to ensure that future down-time doesn’t happen again (improve reliability).
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The benefits of differential circuits

By Poojan Wagh | Published: June 11, 2009
Introduction From my personal blog: I’ve been lucky enough to find myself in a team that’s intent on finding the best circuit design for a given application. This doesn’t happen often to many people, but I feel that I’ve had more than my share of this opportunity. The conclusion is usually that we come up with some topology [...]
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PCB & IC Layout Designer

By Poojan Wagh | Published: June 11, 2009
I generally don’t accept solicitations to post resumes, but I am making an exception for a very talented friend of mine. I know a very good IC designer and PCB designer. My experience with him is as an IC layout designer. However, most of his PCB customers cite him as the best PCB layout designer they’ve [...]
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Polar vs Cartesian RF Modulator Efficiency

By Poojan Wagh | Published: March 21, 2009
I’ve been fielding quite a few questions lately about polar modulation. Indeed, polar modulators are theoretically more efficient. However, this does not need to be the case. I will highlight (technically, self-promote) a Cartesian scheme that can produce an RF signal as efficiently as a polar modulator—with fewer implementation issues.
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Dual DAC CTSD | Wider Bandwidth and Higher SNR — Part 2

By Poojan Wagh | Published: March 10, 2009
Introduction So, we want to break down our continuous-time sigma-delta feedback into two paths: A low-precision tight loop that delivers the first sample to the quantizer A higher-precision loop that goes through a clock delay to minimize “metastability” (indecision)
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