![]() ![]() Strictly Necessary Cookies: (Always Active) These cookies are necessary for the website to function and cannot be switched off in our systems. After we finish updating our website, you will be able to set your cookie preferences. Here V2 to Vx are harmonics to the fundamental V1.Īnalog Devices is in the process of updating our website. Only harmonics within the Nyquist limit are included in the measurement. Total Harmonic Distortion (THD) - The RMS value of the distortion appearing at multiples (harmonics) of the input (or output for a DAC) frequency to the RMS value of the input (or output) sine wave. SFDR is important in certain communication applications that require maximizing the dynamic range of the converter. ![]() Spurious-Free Dynamic Range (SFDR) - The ratio of the RMS value of the sine wave fIN (input sine wave for an ADC, reconstructed output sine wave for a DAC) to the RMS value of the peak spur observed in the frequency domain. The ideal theoretical minimum conversion noise is caused by quantization noise error only and results directly from the data converters resolution. Signal-to-Noise Ratio (SNR) - The RMS value of the sine wave fIN (input sine wave for an ADC, reconstructed output sine wave for a DAC) to the RMS value of the noise of the converter from DC to Nyquist frequency, excluding noise at DC and harmonic distortion content. See also root mean square (RMS) and total harmonic distortion. Signal-to-Noise and Distortion Ratio (SINAD) - The RMS value of the sine wave fIN (input sine wave for an ADC, reconstructed output sine wave for a ADC/DAC) to the RMS value of the noise of the converter from DC to the Nyquist frequency, including harmonic content. SFDR - See spurious-free dynamic range (SFDR). For a sine wave, the RMS value is 0.707 times the peak value, or 0.354 times the peak-to-peak value. Root Mean Square (RMS) - The effective value or effective DC value that an AC signal represents. Using converters with higher resolutions will reduce the quantization error. To more accurately replicate the analog signal, the resolution must be increased. The resolution is the number of discrete levels that are used to represent the signal. Resolution - When an analog signal is digitized, it is represented by a finite number of discrete voltage levels. ENOB is related to SINAD by the following equation: See also signal-to-noise and distortion ratio (SINAD). As fIN increases, overall noise (particularly the distortion components) also increases, thereby reducing the ENOB and SINAD. For dBm, the load resistance must be known for the specification to determine the voltage or current equivalence (that is, 1mW into 50Ω).Įffective Number of Bits (ENOB) - The measured performance (in bits) of an analog-to-digital converter (ADC) with respect to the input frequency (fIN). ![]() When dB is referenced to a carrier signal, it is termed dBc likewise, dB referenced to 1mW is termed dBm. For voltage values, dB is given by 20log(VA/VB). Below is a list that describes what each conversion on the calculator means.ĭecibel (dB) - A unit of relative amplitude defined on a logarithmic scale. ![]()
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