Quadrature Modulator
CMX993/CMX993W
LO Input
R2
R3
BVREF
R1
Q
channel
input amplifier
Q in
R4
R5
Q channel
filter amplifier
BVREF
Divide by 2
or
Divide by 4
R6
R7
R8
R9
C1
C2
C3
C4
RF Output
VREF
Bandgap
BVREF
R10
R11
I
channel
BVREF
R12
filter amplifier
I in
R14
R13
CMX993
I
channel
input amplifier
BVREF
Figure 4 CMX993 Modulator and Input/Filter Amplifier Typical Configuration
LO Input
Q
channel
R5
input amplifier
BVREF
R2
R3
Q channel
filter amplifier
BVREF
Divide by 2
or
Divide by 4
R1
Q in
R4
R7
R6
C2
RF Output
Note: The modulation
C1
C4
signals
connected
may
to
be
the
R9
R8
modulator via either
the MODxN or MODxP
inputs as long as the
connection is the same
C3
VREF
R11
Bandgap
R12
BVREF
I in
for both
channels.
I
and
Q
R13
R14
I
channel
BVREF
filter amplifier
R10
CMX993W
I channel
input amplifier
BVREF
Figure 4a CMX993W Modulator and Input/Filter Amplifier Typical Configuration
2013 CML Microsystems Plc
9
D/993/10
CMLMICRO [ CML MICROCIRCUITS ]
