DESIGN STRUCTURE FOR AN INDUCTOR-CAPACITOR VOLTAGE-CONTROLLED OSCILLATOR

摘要

Embodiments of the present invention provide a design structure and method for compensating for a change in frequency of oscillation (FOO) of an LC-tank VCO that includes a first node; second node; inductor; first capacitive network (FCN) that allows the design structure to obtain a target FOO; compensating capacitive (CCN) network that compensates for a change in the design structure's FOO; second capacitive network (SCN) that allows the design structure to obtain a desired FOO; a filter that supplies a voltage to the SCN and is coupled to the SCN; a transconductor that compensates for a change in the design structure's FOO; and a sub-circuit coupled to the SCN that generates and supplies voltage to the CCN sufficient to allow the CCN to compensate for a reduction in the design structure's FOO. The first and second nodes are coupled to the inductor, FCN, CCN, SCN, and sub-circuit.

主权项

1. A circuit, comprising:
a first node; a second node; an inductor coupled to the first node and the second node; a first capacitive network coupled to the first node and second node, wherein the first capacitive network is designed to allow the design structure to obtain an approximate target frequency of oscillation; a compensating capacitive network coupled to the first node and the second node, wherein the compensating capacitive network is designed to compensate for a change in frequency of oscillation of the design structure caused by a supply voltage dependence of the design structure; a second capacitive network coupled to the first node and the second node, wherein the second capacitive network allows the design structure to obtain a desired frequency of oscillation; a filter coupled to the second capacitive network, wherein the filter supplies a voltage to the second capacitive network; a transconductor coupled to the first node and the second node, wherein the transconductor is designed to compensate for a change in the frequency of oscillation in the design structure; and a sub-circuit coupled to the compensating capacitive network, wherein the sub-circuit generates and supplies voltage to the compensating capacitive network sufficient to allow the compensating capacitive network to compensate for a reduction in frequency of oscillation of the design structure.