Using The Adl5580-Evalz Evaluation Board; Losses And Signal-To-Noise Ratio (Snr) Degradation - Analog Devices ADL5580-EVALZ User Manual

UG-1847

USING THE ADL5580-EVALZ EVALUATION BOARD

LOSSES AND SIGNAL-TO-NOISE RATIO (SNR)
DEGRADATION
The ADL5580 provides a nominal 10 dB of voltage gain defined
between the input and output pins, which translates to a power
gain of 13 dB because the input impedance is twice the output
impedance. The resistive impedance matching converts the
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10dB
VOLTAGE GAIN
100Ω
IN
DIFFERENTIAL
Figure 9. Losses and SNR Degradation
ADL5580-EVALZ
50 Ω differential output to a more common 100 Ω. However,
this resistive impedance matching adds 7.7 dB of attenuation
that must be considered. The miscellaneous components of the
ADL5580-EVALZ can add to the signal losses and degrade the SNR
as well.
7.7dB
POWER ATTENUATION
50Ω
IMPEDANCE
MATCH
DIFFERENTIAL DIFFERENTIAL
Rev. 0 | Page 8 of 14
Evaluation Board User Guide
100Ω
OUT