UPC8126K NEC, UPC8126K Datasheet - Page 11

• Manufacturer Part Number: UPC8126K
• Description: 900 MHz BAND DIRECT QUADRATURE MODULATOR IC FOR DIGITAL MOBILE COMMUNICATION SYSTEMS
• Manufacturer: NEC

RELATION BETWEEN I/Q PIN INPUT DC VOLTAGE AND AMPLITUDE
EXPLANATION OF INTERNAL FUNCTION
90° PHASE
SHIFTER
BUFFER AMP.
MIXER
ADDER
Supply Voltage (V)
Block
2.7 to 3.6
V
CC
Input signal from LO 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 LO 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
V
CC
I/Q DC Voltage (V)
/2 = I = Ib = Q = Qb
1.35 to 1.8
Preliminary Data Sheet P13488EJ1V0DS00
Ib
Single ended input
I
I = Q
500
I/Q input signal (mV
from LOin
Qb
Q
2F/F
2
Block Diagram
P-P
Differential input
I = Ib = Q = Qb
)
PC8126K
250
to MODout
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