Einzeltreffer — DigiBib

Systems and methods are provided for hopping a digitally controlled oscillator (DCO) among a plurality of channels, wherein a gain of the DCO KDCO is a nonlinear function of frequency. A first normalized tuning word (NTW) corresponding to a first channel of the plurality of channels is generated. A first normalizing gain multiplier X is generated based on the nonlinear function of frequency, on an estimate of the nonlinear function of frequency, at a first frequency corresponding to the first channel. The first NTW is multiplied by the first X to obtain a first oscillator tuning word (OTW). The first OTW is input to the DCO to cause the DCO to hop to the first channel. A system for hopping among a plurality of channels at a plurality of respective frequencies comprises a phase-locked loop (PLL), a digitally controlled oscillator (DCO), a multiplexer, and an arithmetic module.

Titel:	Compensation Technique for the Nonlinear Behavior of Digitally-Controlled Oscillator (DCO) Gain
Link:	View record in USPTO Patent Applications (Volltext)
Veröffentlichung:	2020
Medientyp:	Patent
Sonstiges:	Nachgewiesen in: USPTO Patent Applications Sprachen: English Document Number: 20200244271 Publication Date: July 30, 2020 Appl. No: 16/851452 Application Filed: April 17, 2020 Claim: 1. A method for controlling a digitally controlled oscillator (DCO), the method comprising: generating a first normalized tuning word (NTW) corresponding to a first channel of a plurality of channels; generating a first normalizing gain multiplier X based on a nonlinear function of frequency or an estimate of the nonlinear function of frequency, at a first frequency corresponding to the first channel; multiplying the first NTW by the first normalizing gain multiplier X to obtain a first oscillator tuning word (OTW); and inputting the first OTW to the DCO to cause the DCO to hop to the first channel. Claim: 2. The method of claim 1, wherein the first normalizing gain multiplier X is also generated based on a reference frequency fR. Claim: 3. The method of claim 2, wherein the reference frequency fR is the frequency of a second channel of the plurality of channels. Claim: 4. The method of claim 3, wherein the second channel is a central channel of the plurality of channels. Claim: 5. The method of claim 2, further comprising: generating a second NTW corresponding to a first channel of the plurality of channels; generating a second normalizing gain multiplier X based on the nonlinear function of frequency at a second frequency corresponding to a second channel or based on an estimate of the nonlinear function of frequency at the second frequency; multiplying the second NTW by the second normalizing gain multiplier X to obtain a second OTW; and inputting the second OTW to the DCO to cause the DCO to hop to the second channel. Claim: 6. The method of claim 1, wherein at least part of the method is performed in an all-digital phase locked loop (ADPLL). Claim: 7. The method of claim 1, wherein the first normalizing gain multiplier X is based on a linear interpolation of the nonlinear function of frequency at the first frequency. Claim: 8. The method of claim 7, wherein the interpolation is based on a center point of the nonlinear function of frequency. Claim: 9. The method of claim 7, wherein the nonlinear function of frequency is a cubic function of frequency. Claim: 10. The method of claim 7, wherein the interpolation is based on: [mathematical expression included] in which y corresponds to a change in DCO gain variation, f0 corresponds to a frequency at which the DCO gain variation is 100%, and y0 corresponds to the value of the change in DCO gain variation at which the gain variation is 100%. Claim: 11. A system for controlling a digitally controlled oscillator, the system comprising: a digitally controlled oscillator (DCO) having a gain that is a nonlinear function of frequency; a multiplexer configured to generate a plurality of normalizing gain multipliers X, each normalizing gain multiplier X being based on a reference frequency fR and the nonlinear function of frequency, or an estimate of the nonlinear function of frequency, at a respective frequency; and an arithmetic module configured to generate a plurality of oscillator tuning words (OTWs) based on a tuning word and a respective normalizing gain multiplier X, wherein the DCO hops among a plurality of channels based on respective OTWs of the plurality of OTWs. Claim: 12. The system of claim 11, further comprising a phase-locked loop (PLL) configured to generate the tuning words, each tuning word corresponding to a respective channel. Claim: 13. The system of claim 11, wherein at least one of the multiplexer and the arithmetic module are provided as part of a normalized DCO comprising the DCO. Claim: 14. The system of claim 11, wherein each normalizing gain multiplier X is based on a linear interpolation of the nonlinear function of frequency. Claim: 15. The system of claim 14, wherein the interpolation is based on a center point of the nonlinear function of frequency. Claim: 16. The system of claim 14, wherein the nonlinear function of frequency is a cubic function of frequency. Claim: 17. The system of claim 14, wherein the interpolation is based on: [mathematical expression included] in which y corresponds to a change in DCO gain variation, f0 corresponds to a frequency at which the DCO gain variation is 100%, and y0 corresponds to the value of the change in DCO gain variation at which the gain variation is 100%. Claim: 18. A digitally controlled oscillator (DCO) having a gain that is a nonlinear function of frequency, comprising: a multiplexer configured to generate a plurality of normalizing gain multipliers, each normalizing gain multiplier based on a reference frequency fR and the nonlinear function of frequency, or an estimate of the nonlinear function of frequency, at a respective frequency; and an arithmetic module configured to generate a respective oscillator tuning word (OTW) based on each normalizing gain multiplier. Claim: 19. The DCO of claim 18, wherein each normalizing gain multiplier is based on a linear interpolation of the nonlinear function of frequency. Claim: 20. The DCO of claim 19, wherein the linear interpolation is based on a center point of a frequency range. Current International Class: 03; 03; 03; 03; 03

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Compensation Technique for the Nonlinear Behavior of Digitally-Controlled Oscillator (DCO) Gain