Digitally controlled oscillator with segmented varactor bank and multiple-voltage linearization, and associated apparatus

Abstract

A digitally controlled oscillator (DCO) with segmented varactor bank and multiple-voltage linearization and associated apparatus are provided. The DCO may include a varactor array, with the varactor array including a plurality of varactors positioned in the segmented varactor bank, and include a plurality of bridge biasing resistors positioned in the segmented varactor bank, a plurality of capacitors coupled between multiple varactor sets within the segmented varactor bank and a set of differential oscillation nodes of the DCO, and a negative transconductance (gm) network (-gm network) coupled to the set of differential oscillation nodes. Additionally, one set of varactor units and multiple remaining sets of varactor units respectively belonging to at least one varactor set and remaining varactor sets may be configured as active units and frozen units to receive a set of tune voltages and a set of predetermined voltages, respectively, for providing the multiple-voltage linearization at the active units.

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