All About Circuits

Latest Digital Filters Articles and Videos

Categories

Understanding Different Definitions of the Spurious Free Dynamic Range (SFDR) Specification

Understanding Different Definitions of the Spurious Free Dynamic Range (SFDR) Specification

In this article, we’ll look at the spurious free dynamic range (SFDR) which is a popular specification for quantifying the linearity of a circuit.


TI Rolls Out New ADC for Improved Voice Capture in Noisy, Far-field Environments

TI Rolls Out New ADC for Improved Voice Capture in Noisy, Far-field Environments

TI designed the new ADC to capture low-distortion audio recordings from far distances or in noisy environments.


News Nov 05, 2019 by Lisa Boneta.
Learn About SAR ADCs: Architecture, Applications, and Support Circuitry

Learn About SAR ADCs: Architecture, Applications, and Support Circuitry

In this article, we’ll first review the basic architecture of a SAR ADC and then take a look at one of its common applications.


Characterizing the Moog Filter

Characterizing the Moog Filter

This is Part 3 of a series of articles about the Moog ladder filter. In this article, we'll define the characteristics of the Moog filter, including its properties.


Understanding Butterworth Filter Poles and Zeros

Understanding Butterworth Filter Poles and Zeros

This article explores the Butterworth low-pass filter, also known as the maximally flat filter, from the perspective of its pole-zero diagram.


Integrator Limitations: The Op-Amp’s Gain Bandwidth Product

Integrator Limitations: The Op-Amp’s Gain Bandwidth Product

In this first part of a series of articles, we investigate the role of the op-amp’s gain-bandwidth product (GBP).


Low-Noise Voltage References: Understanding the Noise Performance of a Voltage Reference IC

Low-Noise Voltage References: Understanding the Noise Performance of a Voltage Reference IC

Working with a low noise voltage reference? Learn more about noise specifications and relevant voltage reference ICs.


Understanding the Temperature Coefficient of a Voltage Reference

Understanding the Temperature Coefficient of a Voltage Reference

How does temperature affect the output of a voltage reference? What is a temperature coefficient specification?


Understanding the First-Order High-Pass Filter Transfer Function

Understanding the First-Order High-Pass Filter Transfer Function

This article continues our discussion of s-domain transfer functions and their role in the design and analysis of analog filters.


Noise Analysis Using LTspice Tutorial

Noise Analysis Using LTspice Tutorial

Learn how to simulate noise using LTspice and use this great tool to learn more about low-noise design.


Understanding Low-Pass Filter Transfer Functions

Understanding Low-Pass Filter Transfer Functions

This article provides some insight into the relationship between an s-domain transfer function and the behavior of a first-order low-pass filter.


What Is a Low Pass Filter? A Tutorial on the Basics of Passive RC Filters

What Is a Low Pass Filter? A Tutorial on the Basics of Passive RC Filters

What is filtering? Learn what resistor-capacitor (RC) low-pass filters are and where you can use them.


Improving Temperature Sensor Accuracy for Thermocouples and RTDs with Delta-Sigma Converters

Improving Temperature Sensor Accuracy for Thermocouples and RTDs with Delta-Sigma Converters

This design solution evaluates the accuracy of thermocouples used for high-temperature measurements as well as resistance temperature detectors (RTDs) used for local cold-junction-compensation (CJC) points.


DNL and INL Specifications of a DAC: Interpreting INL Shape

DNL and INL Specifications of a DAC: Interpreting INL Shape

This article will examine some properties of the DNL and INL specifications.


New Tunable Low-Pass Filter Brings a Compact Alternative to RF Circuits

New Tunable Low-Pass Filter Brings a Compact Alternative to RF Circuits

The HMC882A from Analog Devices is intended for medical, satellite, industrial, and military applications that operate at frequencies below 6.9 GHz.


News Mar 06, 2019 by Robert Keim
Resolving the Signal Part 12: Reducing the Effects of Power-Supply Noise using Delta-Sigma ADCs

Resolving the Signal Part 12: Reducing the Effects of Power-Supply Noise using Delta-Sigma ADCs

In part 12 of Resolving the Signal, we look at a power-supply noise design example to discuss which supplies are most critical when trying to increase a system's PSR. From that example, we offer best practices to maintain low power-supply noise and debugging tips for a system's overall noise performance.


How to Turn a Schematic into a PCB Layout: PCB Design for a Custom Inclinometer

How to Turn a Schematic into a PCB Layout: PCB Design for a Custom Inclinometer

So you have a schematic. How do you lay out your custom board? In this article, we'll go over the challenges and solutions I came across in designing a custom PCB for an inclinometer subsystem.


Resolving the Signal Part 11: Understanding How Power-Supply Noise Affects Delta-Sigma ADCs

Resolving the Signal Part 11: Understanding How Power-Supply Noise Affects Delta-Sigma ADCs

Part 11 of the Resolving the Signal series explores how power supplies contribute to unwanted noise, how to measure and quantify that noise, and how noise ends up impacting system performance.


What Is Bandwidth?

What Is Bandwidth?

This article explores the surprisingly complicated details associated with a word that we frequently use but perhaps don’t fully understand.


Resolving the Signal Part 10: How Clock Signals Affect Precision ADCs

Resolving the Signal Part 10: How Clock Signals Affect Precision ADCs

Part 10 of the Resolving the Signal series covers how clocks affect precision ADCs, touching on clock jitter, clock intermodulation and best PCB layout practices for clocking.