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 […]
What are the different encoding techniques used for chipless RFID tags?
Encoding refers to converting a message into a different transmission, storage, or processing form. Chipless RFID lacks specialized ASICs to lower costs and use time and frequency domain systems for encoding. Hybrid encoding combines time and frequency domain systems for custom encoding options. A chipless RFID system is a radio frequency identification technology that does […]
