mixer LO input
C8
L2
Vcc
LO in
Mixer Vc
Amp RF out
Amp Ve2
Frequency, MHz L2, nH C8, pF
Cbl
Amp
RF output
C1 R3
0.01 µF
LO in
Ref
gnd
22 pF
1000 pF
10 pF
C6
900
12.5
5.4
3.1
2.8
1.6
2.2
2.2
2.2
2.2
2.2
Vcc
Amp Vc
C12 (100 pF)
R1
Amp1 Ve1
Amp RF in
enable
Amp1 Ve2
gnd
IF in
IF in
Amp RF out
Amp Ve2
1500
1800
1900
2400
R2
Rterm
mixer IF input
standby input
C15
C14
C6
Mixer RF out
Amp1 Ve1
Amp RF in
enable
Amp1 Ve2
gnd
standby
input
L3
mixer RF output
L3
Mixer RF out
Sideband
Filter
Figure 13. Mixer Only Use (AC
Figure 14. 900 MHz Use. Refer to
Table 2 for Component Values.
Table 3. Amp Output Match
Component Values vs. Frequency.
Coupled Single-ended Use Shown).
Refer to Table 2 for Component
Values.
1. LO in and LO bar in are identical; either
can be used as the single-ended LO
input with the other AC grounded.
Cbl (>100 pF)
differential
mixer LO input
Cbl (>100 pF)
single-ended
mixer LO input
LO in
LO in
C1
R3
2. R3 lowers the Q of the blocking
capacitor to remove possible reso-
nances for broadband operation below
1.75GHz.
LO in
LO in
Cbl (>100 pF)
Figure 16. LO Connections for
Balanced Operation.
Figure 15. LO Connections for Single-
ended Operation.
1. The IF pins require a bias voltage to
operate properly (see Table 4). When
the IF is AC coupled, this voltage is
supplied from the Ref pin via R1 and R2.
When the IF is DC coupled, the voltage
is externally generated and the Ref pin
is not used.
10 pF
10 pF
1000 pF
1000 pF
Ref
Ref
2. The base current is small, so to 1st
order the value of R1, R2 can be
selected to set the IF load impedance
(50-200ohmtyp.)
R1
R1
C6
C6
balanced
mixer IF input,
AC coupled
IF in
IF in
IF in
Rterm
single-ended
R2
R2
IF in
3. IF in and IF bar in are identical; either
can be used as as the single-ended IF
input with the other AC grounded.
mixer IF input,
AC coupled
C6
C6
Figure 17. IF Connections for AC
Coupled Single-ended Use.
Figure 18. IF Connections for AC
Coupled Balanced Use.
4. Rterm (optional) should be the same
value as the IF source impedance. It
improves LO rejection by balancing the
IF port and also de-Q’s C6.
1. For DC coupled operation, the IF input
must also supply Vbase to both IF in and
IF in bar, per the values in Table 4. Ref
pin is not used.
V , V
V
, V
cc
base
2.7
3.0
3.5
4.0
4.5
5.0
1.5
balanced mixer IF input,
DC coupled. DC level of
IF source must be at
1.5
Ref
1.5-1.75
1.5-2.0
1.5-2.25
1.5-2.5
V base (Table 4).
IF in
IF @ V base
IF in
Figure 19. IF Connections for DC
Coupled Use.
Table 4. Vbase vs. Vcc. Vbase is the
required bias at the IF ports.
7-72