MCP33131 datasheet(42/54 Pages) MICROCHIP

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MCP33131/MCP33121/MCP33111-XX

DS20006122A-page 42

 2018 Microchip Technology Inc.

Total Harmonic Distortion (THD)

THD is the ratio of the power of the fundamental (PS) to

the summed power of the first 13 harmonics (PD).

EQUATION 8-4:

THD is typically given in units of dBc (dB to carrier).

THD is also shown by:

EQUATION 8-5:

Common-Mode Rejection Ratio (CMRR)

Common-mode rejection is the ability of a device to

reject a signal that is common to both sides of a

differential or pseudo-differential input pair. The

common-mode signal can be an AC or DC signal or a

combination of the two. CMRR is measured using the

ratio of the differential signal gain to the common-mode

signal gain and expressed in dB with the following

equation:

EQUATION 8-6:

THD

--------







log

THD

 V

------------------------------------------------------------------

log

–

Where:

V1 = RMS amplitude of the

fundamental frequency

V1 through Vn = Amplitudes of the second

through nth harmonics

CMRR

ADIFF

ACM

------------------







log

Where:

ADIFF = Output Code/Differential Voltage

ADIFF = Output Code/Common-Mode Voltage

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