TDA8050 Datasheet, PDF (10/24 Pages) NXP Semiconductors – TDA8046H

Philips Semiconductors
QPSK transmitter
handbook, full pagewidth
500 kHz
50 Ω
50 Ω
300 kHz
Product specification
TDA8050
I_IN
I_INC
RF_OUT
RF_OUTC
Q_IN
Q_INC
39.1 39.5 39.7 39.9
40
40.1 40.3 40.5 40.7
f (MHz)
FCE184
3rd-order intermodulation distortion;
Two tones of 260 mV (p-p) at each I and Q input:
V_(av) = ^{4----02---0--} × 10^{2-–---40--}= 128 mV (RMS)
2 sine waves with a total RMS values of 128 mV give:
2 × x² = 128
x = ^1----2---8-- = 90 mV (RMS) = 260 mV (p-p) and f₁ = 300 kHz,
2
f₂ = 500 kHz and f_RF = 40 MHz.
Fig.4 3rd-order intermodulation distortion in I and Q channels (IM3).
1999 Dec 14
10