Abstract: An apparatus comprising a first circuit, a second circuit and a third circuit. The first circuit may be configured to generate an upconverted signal in response to an input signal and a first oscillation signal. The second circuit may be configured to generate a downconverted signal in response to the upconverted signal and as second oscillation signal. The third circuit may be configured to generate an output signal in response to the downconverted signal and a third oscillation signal derived from the second oscillation signal. The upconverting and downconverting may filter undesired channels from the output signal.

Abstract: An initial phase control for an oscillator such as a differential ring voltage-controlled oscillator is disclosed. The initial phase control generally comprises a current source circuit coupled to a first node of the delay cell and a current provider. The current source circuit and current provider are preferably selectively and synchronously in an on or off state such that when the current source circuit and current provider are in an on state, the current source circuit draws a current through the first node of the delay cell and the current provider provides current through a second node of the delay cell. A method for controlling a delay cell and an initial phase control for a differential ring oscillator having a plurality of delay cells in a ring configuration are also disclosed.

Abstract: A system and method for a supply-independent VCO biasing scheme for generating bias voltages and currents for a VCO of a phase-locked loop are disclosed A biasing scheme for generating a bias electrical signal comprises a first and second current source coupled to a power supply, a current drain coupled to the second current source and to ground, a replica device having a first node, a second node coupled to the second current source and the current drain, and a third node coupled to ground, and a first and second current splitting device having first nodes coupled to each other and to the current source and having third nodes coupled to the first and second nodes of the replica device, respectively.

Abstract: A system and method for a differential charge pump with reduced charge-coupling effects for use in integrated circuits such as a phase-lock loop are disclosed. The charge pump includes a first branch, a second branch, and a charge device. The first branch includes a first current source and sink coupled to a power supply and ground, respectively, a first current steering device coupled between the first current source and sink, and a first buffer coupled to the first current steering device between a first charge node and a first damp node. The second branch includes a second current source and sink coupled to a power supply and ground, respectively, a second current steering device coupled between the second current source and sink, and a second buffer coupled to the second current steering device between a second charge node and a second damp node.