Power Tips #148: A simple software method to increase the duty-cycle resolution in DPWM
Have you ever had a duty-cycle resolution issue in your digitally controlled power supply?
In a digital pulse width modulation (DPWM)-controlled power supply, the duty-cycle adjustment is not continuous, but has a minimum step. This is one significant…
SCR topology transmogrifies into BJT two-wire precision current source
Recently, frequent Design Idea (DI) author Christopher Paul showcased an innovative and high performance true-two-wire current source using a depletion mode MOSFET as the pass device in “A precision, voltage-compliant current source.”
In…
Magnetometers: Sensing the invisible fields
From ancient compasses to modern smartphones, magnetometers have quietly shaped how we sense and navigate the world. Let us explore the fundamentals behind these field-detecting devices.
Magnetic fields are all around us, yet invisible to the…
Guard circuit provides impedance matching
The first hits from a Google search of the term “guard circuit” produce a series of references to the National Guard on some security circuit. Deep in the list is a printed circuit board company that touts that they design guard rings on…
Where co-packaged optics (CPO) technology stands in 2026
Co-packaged optics (CPO) technology, a key enabler for next-generation data center architectures, promises unprecedented bandwidth density and power efficiency by tightly integrating optical engines with switch silicon. But after nearly a decade…
2026: A technology forecast for AI’s ever-evolving bag of tricks
Read on for our intrepid engineer’s latest set of predictions for the year(s) to come.
As has been the case the last couple of years, we’re once again flip-flopping what might otherwise seemingly be the logical ordering of this and its companion…
Gray codes: Fundamentals and practical insights
Gray codes, also known as reflected binary codes, offer a clever way to minimize errors when digital signals transition between states. By ensuring that only one bit changes at a time, they simplify hardware design and reduce ambiguity in applications…
Crowbar circuits: Revisiting the classic protector
Crowbar circuits have long been the go-to safeguard against overvoltage conditions, prized for their simplicity and reliability. Though often overshadowed by newer protection schemes, the crowbar remains a classic protector worth revisiting.
In…
Does the cold of deep space offer a viable energy-harvesting solution?
I’ve always been intrigued by “small-scale” energy harvest where the mechanism is relatively simple while the useful output is modest. These designs, which may be low-cost but may also use sophisticated materials and implementations, often…
Ignoring the regulator’s reference redux
Stephen Woodward’s “Ignoring the regulator’s reference” Design Ideas (DI) (see Figure 1) is an excellent, working example of how to include a circuit in the feedback loop of an op amp to support the stabilization of the circuit’s operating…
Aiding drone navigation with crystal sensing
Designers are looking to reduce the cost of drone systems for a wide range of applications but still need to provide accurate positioning data. This however is not as easy is it might appear.
There are several satellite positioning systems,…
Active two-way current mirror
EDN Design Ideas (DI) published a design of mine in May of 2025 for a passive two-way current mirror topology that, in analogy to optical two-way mirrors, can reflect or transmit.
That design comprises just two BJTs and one diode. But while…
