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參數(shù)資料
Biasing and Operation
The recommended DC bias condition for optimum
performance, and reliability is Vg=+0.4 volts. There is
approximately zero current consumption for the gate
biasing because the FET mixer was designed as the pas-
sive operation.
Figure 1 is a simple block diagram, as reference for
Figure 2. Figure 2 is a schematic of the image-rejection
(SSB) mixer MMIC connected to an off-chip quadrature
hybrid.
Figures 3 through Figure 11 show typical measure-
ment results under the image rejection operation. Data
presented for the AMMC-6550 was obtained using the
circuit described here. Please note that the image rejec-
tion and isolation performance is dependent on the
selection of the low frequency quadrature hybrid. The
performance specification of the low frequency quadra-
ture hybrid as well as the phase balance and VSWR of the
interface to the AMMC-6550 will affect the overall mixer
performance.
No ground wired are needed since ground connections
are made with plated through-holes to the backside of
the device.
Figure 1. AMMC-6550 Schematic
Figure 2. AMMC-6550 Assembly diagram for SSB mixer applications. 50
termination is required for the unwanted side-band termination
IF1
IF2
LO
RF
Vg
LSB
USB
LO
IF
IF1
IF2
LO
RF
Vg
LO
15-50GHz
+10dBm
LSB
USB
RF
15-50GHz
+0.4V
100pF
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