UPC8104 NEC, UPC8104 Datasheet - Page 7

• Manufacturer Part Number: UPC8104
• Description: UP CONVERTER + QUADRATURE MODULATOR IC FOR DIGITAL MOBILE COMMUNICATION SYSTEMS
• Manufacturer: NEC

EXPLANATION OF INTERNAL FUNCTION
90 PHASE
SHIFTER
BUFFER AMP.
MIXER
ADDER
BLOCK
Input signal from Lo1 is send to digital
circuit of T-type flip-flop through frequency
doubler. Output signal from T-type F/F is
changed to same frequency as Lo1 input
and that have quadrature phase shift, 0 ,
90 , 180 , 270 . These circuits have
function of self phase correction to make
correctly quadrature signals.
Buffer amplifiers for each phase signals to
send to each mixers.
Each signals from buffer amp. are
quadrature modulated with two double-
balanced mixers.
High accurate phase and amplitude inputs
are realized to good performance for
image rejection.
Output signals from each mixers are
added with adder and send to final
amplifier.
FUNCTION/OPERATION
Data Sheet P10099EJ4V0DS00
I
I
from Lo1in
Q
Q
BLOCK DIAGRAM
2 F/F
2
PC8104GR
to MODout
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