A Phase Lock Loop (PLL) is a negative feedback control system designed to synchronize an oscillator’s output phase and frequency with a reference signal. PLLs are standard components in applications requiring frequency synthesis, clock recovery, and skew cancellation. To analyze a PLL effectively, engineers evaluate the system in the complex frequency domain (Laplace transform) and […]
How to spot and fix the hidden modeling gaps in analog simulation
Analog and mixed-signal designers frequently balance simulation speed with physical accuracy. To meet project timelines, engineering teams often use compact models, averaged behaviors, and linearized solvers. While these models serve as useful approximations, they can introduce specific limitations. This technical FAQ examines three modeling gaps identified in engineering literature and outlines algorithmic methods to address […]
Feedback topologies and architecture explained
Feedback refers to a core concept in circuit design and control theory, used to stabilize amplifiers and control system behavior. This article outlines the fundamental architecture of feedback, classifies standard topologies, and examines a practical hardware implementation as a case study. What is the fundamental architecture of a feedback system? A feedback system consists of […]
Supercapacitors explained
Supercapacitors are a special type of electrochemical energy storage device noted for their ability to deliver sudden bursts of energy. Batteries typically provide the bulk energy required for sustained operation, whereas dielectric capacitors offer the rapid discharge rates necessary for filtering and pulse power. In such a scenario, supercapacitors address the gap between these two […]
What are attention mechanisms, and how do they work in speech and audio processing?
Attention mechanisms are very useful innovations in the field of artificial intelligence (AI) for processing sequential data, especially in speech and audio applications. This FAQ talks about how attention mechanisms work at their core, how they are used in automatic speech recognition systems, and how transformer architectures can handle advanced audio processing. What are the […]
How does a basic digital-to-analog converter (DAC) perform signal conversion?
A digital-to-analog converter (DAC) transforms digital binary data into an analog signal using weighted contributions from each bit. In this FAQ, we discuss the two most commonly known ways of DAC conversion: weighted resistor DAC and R-2R ladder DAC. Before getting into the conversion types, let us understand the basic steps involved in a DAC […]
What are the different taxonomies of RFID tags, and how do they differ? part 2
The second part of this FAQ focuses on how RFID tags are categorized based on frequency bands and the presence/absence of microchips in RFID tags. While the classification based on frequency is well known, it helps practicing engineers to know about chipless RFID tags. Types of RFID Tags based on frequency bands Categorizing RFID tags […]
What are the different taxonomies of RFID tags, and how do they differ? part 1
The common way of categorizing RFID tags is based on how they utilize power for communication between the reader and the tag. They can also be classified based on operating frequency and absence/presence of chips. This first part of the FAQ will cover the passive, semi-passive, and active RFID tags categorized based on power. Types […]
What is the voltage standing wave ratio (VSWR) in RF systems?
Voltage Standing Wave Ratio (VSWR) is a fundamental parameter that measures the efficiency of radio frequency (RF) power transmission from a source through a transmission line to a load. A simple way to measure VSWR is to find the highest to lowest voltage ratio in a standing wave created on a transmission line due to […]
Achieving isolation in an isolation amplifier
Isolation amplifiers create a galvanic isolation barrier between input and output circuits to protect sensitive equipment and personnel from high voltages. Such isolation can be optical, capacitive, or inductive in an isolation amplifier. This FAQ will help us understand how each isolation type works and how they differ. How do optical isolation amplifiers work? Optical […]
