As can be seen in Figure 4, the phase slope can be adjusted through the varactor tuning
The Q of the varactor diodes was simulated and measured to be between 4 and 6 within the varactor tuning
range, as shown in Figure 6.
The models GVD6O100 and GVD60200 silicon varactor tuning
diodesare offered in a new surface-mount monolithic package (SMMP).
The equation has been modified to include the effects of varactor tuning
Next, tracking of the amplitude and phase response should be checked while adjusting the varactor tuning
The circuit requires two adjustable voltages, one for each PIN diode, for varactor tuning
The wide varactor tuning
range is useful for frequency modulated communication links, radar and electronic warfare applications.
With MMICAD it is now possible to specify a C-V specification for a varactor tuning
diode that will produce optimum results.
Acting as a phase detector, when the output frequency is a direct multiple of the clock rate, the output of the SPD is the error voltage which, after filtering and amplication, is applied to the varactor tuning
diode in the DRO.
Demonstrated VCO performance advantages include broadband, continuous and spurious signal-free varactor tuning
and high output power levels (to 0.