Extended frequency range voltage-controlled oscillator

摘要

VCO frequency is continuously variable through a wide frequency range in proportion to a first control voltage VC produced by a PLL containing the VCO. A second control voltage NVC is produced as a monotonically decreasing function of VC. A first current I0 is produced in proportion to VC and a second current I1 is produced in proportion to NVC. I1 is subtracted from I0, producing a control current IC=I0-I1 which is applied to the VCO.