1999 Nov 05

10

Philips Semiconductors

Product specification

QPSK transmitter

TDA8050A

FCE435

LO(sup)

measure 2 flo(2)

imbalance

measure 1 flo(2)

frequency

IF_FILT

Fig.3 Imbalance and LO suppression.

The amplitude imbalance and the LO suppression are measured in the spectrum of the signal measured at the output IF_FILT

and are defined in the following conditions:

measure 1: I input frequency = 500 kHz; I input level = 400 mV (p-p) sine wave; unused input as 0 V differential.

measure 2: Q input frequency = 500 kHz; Q input level = 400 mV (p-p) sine wave; unused input as 0 V differential.