Variable Capacitors (VAC) FAQ

Characteristics

On the input impedance of the control voltage

Input impedance (Vtune –GND)
   
Vtune and GND
Circuit model
 
   
P/N
Parallel Cap.
(pF)
Parasitic Cap.
(pF)
RF signal Cut
Resistance
(Ω)
Insulation
Resistance
(Ω)
LXRW-050,056  3,300  0.5  150k  10M
LXRW-054,055  3,840  0.5  150k  10M
LXRW-053  5,760  0.5  150k  10M
LXRW-058, 059  12,800  0.5  50k  10M
Input impedance Details(Vtune –GND)


VAC consists of a capacity part and a resistor part.
The two capacitors and the resistance can be simplified between the vtune and GND.


Measurement results(LXRW19V201-058) 

The capacitance between VTune and GND is 12.8 nf * and parasitic capacitance is about 0.5 pf.

*Simulation parameters


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