In addition, the increased phase variation that is available increases the oscillator tuning range
without resulting in an impractical [K.sub.vco].
For the experimental filter, the tuning range
is 58% from 1.38 to 2.50 GHz whose 3-dB ABW is 116 [+ or -] 11 MHz, and insertion loss of 2.7-3.9 dB (better than 3 dB from 1.8 to 2.5 GHz).
The dual strongly magnetic coupled LC tanks with fixed and tunable capacitive elements can further extend tuning range
and improve phase noise.
In actual operation, acquisition time is typically much less than 1 s, since the frequency changes tend to be far less than the full filter tuning range
The oscillation frequency is function of inductance, capacitance of varactor and active capacitance, and the tuning range
is determined by the amount of fixed capacitance versus available capacitance in the circuit.
From 6 to 12 GHz, this VCO achieves +6 dBm output power and -100 dBc/Hz phase noise at 100 kHz offset, with 300 MHz instantaneous tuning range
achieved through use of an external RF filter.
One such component is the micro electromechanical voltage tunable capacitor, which can enable a wide tuning range
and high quality (Q) factors.
In the RF Sweep mode, the operator may view a scan as wide as the entire receiver input tuning range
of 2 to 26.5 GHz.
As a result, much emphasis has been placed on thin film ferroelectric material barium strontium titanate, (BaSr)Ti[O.sub.3], or BST, because of its promising properties related to capacitance tuning range
, dielectric loss, breakdown voltage, power handling and component integration.