6. TEST METHODS
(1) Mixer input section
(a) With 50 Ω resistance termination
µPC8002
(b) With 50 Ω LC matching
470 pF
8
MIX IN1
VMIX
50 Ω
VMIX
CNote
LNote
470 pF
8
MIX IN1
Note
Since the values of L and C are affected by the board’s parasitic capacitance and inductance, L and
C should be adjusted so that the impedance looking at the MIX IN pin side from the signal source is
50 Ω.
(2) Third order intercept
MIX IN1
8
50 Ω
470 p
MIX OUT
2
82 pF
16.7 Ω
VMIX
16.7 Ω
16.7 Ω
f1 = 250.3 MHz
f2 = 250.6 MHz
LO IN
5
470 p
50 Ω
fOSC = 239.3 MHz
18