Patent ID: 6831494
Filing Date: 2004-12-14
Classification: H03K

Abstract:
An integrated circuit comprising:a first stage comprising first transistor devices comprising a first threshold voltage; a first feedback stage comprising transistor devices comprising a first plurality of threshold voltages, wherein at least one of said first plurality of threshold voltages is different from said first threshold voltage, wherein said first feedback stage is coupled to said first stage in a feedback configuration; wherein said first feedback stage comprises a frequency-voltage characteristic that, when combined in opposition with a frequency-voltage characteristic of said first stage, produces a frequency-voltage characteristic of said integrated circuit that is more stable with respect to voltage over a range of frequencies than is said first stage; wherein said feedback configuration comprises an output of said first stage driving an input of said first feedback stage and output of said first feedback stage driving an input of said first stage; and wherein said first feedback stage comprises a second feedback stage, said second feedback stage comprising: transistor devices comprising a second plurality of threshold voltages, wherein at least one of said second plurality of threshold voltages is different from one of said first plurality of threshold voltages; and wherein said second feedback stage is coupled to said first feedback stage in a feedback configuration.