µPC8001
Figure 3-1. Mixer Input
(a) 50Ω Termination
(b) LC Matching
VMIX IN
0.01µ F
50Ω
14 MIX IN1
VMIX IN
Note
5 pF
0.01µ F
14 MIX IN1
Note
107 nH
Note The values L and C are affected by the parasitic capacitance and inductance of the board. Therefore,
adjust L and C so that the impedance at the MIX IN pin from the signal source equals 50Ω.
Remark The signal source impedance is 50Ω.
MIX IN1
14
0.01µ F
16.7 Ω
50 Ω
Figure 3-2. Third Order Intercept
MIX OUT
9
0.01µ F
1.5 kΩ
OSC IN
11
VOSC IN = –15 dBm
0.01µ F
50 Ω
Measure 455 kHz component
level with spectrum analyzer
fOSC IN = 129.545 MHz
16.7 Ω
16.7 Ω
f1
f2
f1 = 130.1 MHz, f2 = 130.2 MHz
6 dB/OCT
18 dB/OCT
f = 130 MHz
f1 = 130.1 MHz
f2 = 130.2 MHz
Remark Signal source impedance is 50Ω.
VMIX IN [dBm]
Third order intercept
11