Voltage-Controlled Oscillator (VCO)
@j
and Buffer Amplifier
@
The VCO output frequency with the tuning voltage set to -14.2 V should be 380 MHz.
Typical voltage levels for the VCO are as shown in Table 1.
Table 1. Typical VCO Voltage Levels
LO Output Amplifier
@
Table 2. Typical LO Output Amplifier Voltage Levels
A7A4A2
Voltage Levels
Q5
Q2
Ql
Emitter
-6.9
-6.7
-6.7
Base
-6.2
-6.2
-6.2
Collector
-0.5
0.0
0.0
LO Amplifier
@
and M/N Output Amplifier
@
Table 3. Typical LO and M/N Output Amplifier Voltage Levels
A7A4A2
Voltage Levels
Q6
Q7 Q3 Q4
Emitter
-6.7 -3.1
-4.5
-5.2
Base
-6.2 -2.4
-3.8
-4.5
Collector
-2.4 -1.1
0.0
-2.3
A7A4
3