Archive for the Category: RF and Microwave Design

Tunable LC Bandpass Filters- Part I & II

I’ve just completed Parts I and II of a design document for tunable bandpass filters using varactors. A number of helpful closed-form solutions are included. Link to Part I. Link to Part II.

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Updated Filter Design Documentation

Major revision to my filter design documentation 5.74 MB

Also posted in Mathematics, RF Filter Design, Software and Programming Leave a comment

New Article in May Microwaves & RF

I have a feature design article that is to be published in the May issue of Microwaves & RF. After it runs, I will post a copy of the complete article in PDF format for easier reading. The article presents several nonconventional methods that can help with demanding PLL designs.

Also posted in Phase-Locked Loops (PLL) Leave a comment

Dreaded Interview Questions Just for Fun- Part I

James A Crawford Having reached a sufficient station in life that I have either heard most of the typical interview questions that might come my own direction, or have the wit and nonsense to navigate my way through something that I don’t know and talk about the weather or something completely unrelated, this on-going collection […]

Also posted in Frequency Synthesis, Mathematics, Phase-Locked Loops (PLL), RF Filter Design, RF System Design Leave a comment

Pendulum & Elliptic Integrals

Many years ago before the advent of the “PC on every desktop” age, I became fascinated with the design of LC elliptic filters. As part of that endeavor, I also became intimately acquainted with elliptic integrals. Having an equal intrigue for numerical precision, I found that computing the elliptic integrals with high accuracy was very […]

Also posted in Mathematics, RF Filter Design Leave a comment