Contents
What are harmonic spurs?
Harmonics – Harmonics, or harmonic frequencies, are frequencies that are integer multiples of the fundamental frequency. Spurs—Spurs, also known as device spurs, are frequency components that appear in signals because of the electrical components of the instrument.
What are Spurs in RF?
Spur-search background A spurious response in a mixer or frequency converter is any frequency or range of frequencies that may come into the system, and be converted into the IF band, that is not at the desired or tuned frequency.
What are harmonics RF?
Harmonics are a subset of Spurious signals found at integer multiples of the fundamental frequency of the signal. Harmonics and Spurious levels are measured in ‘dBc’ which is the ratio of input signal power vs the carrier signal power.
What is spur signal?
Spurs—Spurs, also known as device spurs, are frequency components that appear in signals because of the electrical components of the instrument. Some examples of spurs are interleaving anomalies in analog-to-digital converters (ADCs), leakage of oscillator clock signals, and power inserted by amplifiers.
What is spur in communication?
From Wikipedia, the free encyclopedia. In electronics (radio in particular), a spurious tone (also known as an interfering tone, a continuous tone or a spur) denotes a tone in an electronic circuit which interferes with a signal and is often masked underneath that signal.
How do you measure THD?
In order to perform a true THD measurement, energy must be measured separately at harmonics of the input signal. Amplitudes at each harmonic frequency are squared, and then summed. The square root of the sum is the value of THD.
The spurs are summarized as a harmonic spur or interleaving spur, depending on the cause. The cause of the harmonic spur is the non-linear behavior of the ADC, and the frequency of the spur is an integral multiple of the input signal. In addition, the harmonic distortion has an aliased signal in every Nyquist zone due to the sampling process.
How are input frequency and fixed frequency spurs related?
The spurs can be categorized as input frequency dependent spurs and fixed frequency spurs. The input frequency dependent spurs are related to harmonic or nonlinearity performance. This article will focus on the fixed frequency spurs that are caused by power supplies, external references, digital interfacing, external interference, and more.
How to deal with high frequency spur issues?
Use a low-pass filter at the front end of the AD4003 ADC to attenuate the coupled dc-to-dc switching frequency interference to a level that meets the design target (that is, spur buried in noise floor) if the application bandwidth allows it. Use the new SDP-H1 board (BOM Rev 1.4), which uses a shielded inductor for L5.
Are there any spurs that limit the performance?
However, there are spurs that can occur and limit the performance due to other aspects of the system. The spurs can be categorized as input frequency dependent spurs and fixed frequency spurs. The input frequency dependent spurs are related to harmonic or nonlinearity performance.