Negative impedance can be created using active circuits like negative impedance converters (NICs), and it’s useful for canceling out unwanted inductance in circuits, improving power system compensation, and enabling wider bandwidths in applications like audio systems, communication, and metamaterials. NICS can improve the bandwidth and efficiency of electrically small antennas, including those that comprise metasurfaces, […]
FAQ
Power-supply supervisors keep circuits in check: part 2
Is my power supply OK, and what if it isn’t? Is my microprocessor still working? In part 1, we examined the operation of power supply supervisory ICs that can detect when the supply voltage is too low, and what might happen if so. We will continue that analysis and then consider ways to keep an […]
Power-supply supervisors keep circuits in check: part 1
Is my power supply OK? What about my microprocessor? What if something goes wrong? Simulations show what happens if DC voltage drops. Microprocessors can behave in unwanted ways when their power supplies don’t deliver the expected voltage. Errors can occur, circuits can unexpectedly reset or even go rogue. To prevent such problems, many devices use […]
Understanding ADC specs and architectures: part 5
ENOB describes an analog-to-digital converter’s performance with respect to total noise and distortion. In the earlier parts of this series on analog-to-digital converters (ADCs), we looked at the basics (part 1); gain error, offset error, and differential nonlinearity (part 2); integral nonlinearity (part 3); and then we looked at some ADC topologies and introduced AC […]
Understanding ADC specs and architectures: part 4
The AC performance of an analog-to-digital converter depends on its architecture. In part 3 of this series, we discussed the integral nonlinearity (INL) error of an analog-to-digital converter (ADC), noting that gain, offset, and INL error all contribute to the total unadjusted error. This metric provides an overall view of an ADC’s DC performance. Q: What about the AC […]
Understanding ADC specs and architectures: part 3
Integral nonlinearity tracks the cumulative effects of an ADC’s differential nonlinearity. In part 2 of this series, we discussed several sources of error in an analog-to-digital converter (ADC), including gain, offset, missing-code error, and differential nonlinearity (DNL). We concluded with an illustration of a waveform with varying levels of DNL superimposed on the staircase representing […]
Understanding ADC specs and architectures: part 2
Specifications such as gain error, offset error, and differential nonlinearity help define an analog-to-digital converter’s performance. In part 1 of this series, we discussed an ideal analog-to-digital converter (ADC), noting that it would have infinite resolution and bandwidth. Then we looked at the real world of practical inverters and how their resolution, expressed in a […]
How op amps work and why you should use them: part 3
Operational amplifiers (op amps) are almost the perfect amplifier. As long as you keep a few important details in mind, their imperfections will seem invisible. In part 1, Equations 2 and 3 used the term AV for the voltage gain of the simple noninverting amplifier shown in Figure 1. The equations use α for the […]
What are the best practices for PCB-to-harness transitions?
Transition points between PCB traces and wire harnesses impact signal integrity, system-level reliability, and manufacturability. Improperly calibrated transition points can introduce impedance discontinuities, signal loss, or thermal stress. Mechanical strain and layout constraints also restrict routing flexibility, complicate manufacturing, and may contribute to long-term system failures. This article outlines best practices for optimizing PCB-to-harness transition […]
Streamlining PCB-to-wire harness design integration with EDA tools
Automotive wiring harnesses consolidate multiple wires and cables into a single organized system, transmitting power and signals between electronic control units (ECUs). These harnesses connect PCB-mounted electronics to the broader electrical system, supporting advanced driver-assistance systems (ADAS), powertrain control, airbags, infotainment, telematics, and body electronics. This article examines the PCB-to-wire harness design flow and highlights key integration […]
