mixer LO input
Cbl
1000 pF
LO in
C1 R3
LO in
10 pF
C6
Rterm
mixer IF input
C6
Amp1 Ve1
Amp RF in
standby input
enable
Amp1 Ve2
gnd
Mixer RF out
mixer RF output
L3
R2
IF in
Amp Ve2
R1
IF in
Amp RF out
Ref
gnd
22 pF
Amp Vc
Mixer Vc
0.01
µF
Vcc
C8
Amp RF out
Amp Ve2
Amp1 Ve1
Amp RF in
C15
enable
standby
input
Sideband
Filter
Mixer RF out
L3
Amp1 Ve2
gnd
C14
Amp
L2 RF output
Vcc
C12 (100 pF)
Frequency, MHz L2, nH C8, pF
900
12.5
2.2
1500
1800
1900
2400
5.4
3.1
2.8
1.6
2.2
2.2
2.2
2.2
Figure 13. Mixer Only Use (AC
Coupled Single-ended Use Shown).
Refer to Table 2 for Component
Values.
Figure 14. 900 MHz Use. Refer to
Table 2 for Component Values.
Table 3. Amp Output Match
Component Values vs. Frequency.
single-ended
mixer LO input
Cbl (>100 pF)
LO in
C1
R3
LO in
differential
mixer LO input
Cbl (>100 pF)
LO in
LO in
Cbl (>100 pF)
1. LO in and LO bar in are identical; either
can be used as the single-ended LO
input with the other AC grounded.
2. R3 lowers the Q of the blocking
capacitor to remove possible reso-
nances for broadband operation below
1.75 GHz.
Figure 15. LO Connections for Single-
ended Operation.
Figure 16. LO Connections for
Balanced 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.
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 -200 ohm typ.)
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.
4. R
term
(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.
10 pF
1000 pF
Ref
C6
Rterm
single-ended
mixer IF input,
C6
AC coupled
R2
IF in
R1
IF in
balanced
mixer IF input,
AC coupled
10 pF
1000 pF
Ref
C6
R2
IF in
C6
Figure 18. IF Connections for AC
Coupled Balanced Use.
R1
IF in
Figure 17. IF Connections for AC
Coupled Single-ended Use.
balanced mixer IF input,
DC coupled. DC level of
IF source must be at
V base (Table 4).
IF @ V base
Ref
IF in
IF in
V
cc
, V
2.7
3.0
3.5
4.0
4.5
5.0
V
base
, V
1.5
1.5
1.5-1.75
1.5-2.0
1.5-2.25
1.5-2.5
1. For DC coupled operation, the IF input
must also supply V
base
to both IF in and
IF in bar, per the values in Table 4. Ref
pin is not used.
Figure 19. IF Connections for DC
Coupled Use.
Table 4. V
base
vs. V
cc
. V
base
is the
required bias at the IF ports.
7-72
AGILENT [ AGILENT TECHNOLOGIES, LTD. ]
