A linear phase locked loop with a double-tuning

A linear PLL includes a VCO with a first and second tuning element. The first tuning element is adjusted in proportion to the phase error between an input signal and a VCO signal and the second tuning element is adjusted by an integral function of the phase error. By configuring the VCO with separate tuning elements which are set proportional separated to the phase error and an integral function of the phase error, the 3-dB bandwidth frequency of the linear PLL depends mainly on the phase detector gain and the VCO gain of the proportional adjustment contributed. A linear PLL with separate proportional and integral tuning elements may be designed to show a relative constant gain over a relatively large frequency range.