Patent US6144844A successfully refreshed from Google Patents.
US6144844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and system for controlling frequency
Assignee: Silicon Laboratories Inc
•
Filing: 1997-08-12
•
Granted: 2000-11-07
•
Expires: 2017-08-12
Abstract
Abstract A method and system for receiving a signal in a received frequency and shifting the received frequency to become a desired frequency is provided. The system includes a controllable oscillator for generating a first internal frequency, a frequency estimating unit connected to the controllable oscillator, a first frequency shift unit, connected to the controllable oscillator and to the frequency estimating unit, for shifting the received frequency according to the first internal frequency, thereby obtaining an initially shifted frequency and a second frequency shift unit connected to the first frequency shift unit and the frequency estimating unit for shifting the initially shifted frequency. The frequency estimating unit determines a total frequency shift value from the desired frequency, the received frequency and the first internal frequency and it also determines a first frequency shift value and a second frequency shift value from the total frequency shift value. Furthermore, the frequency estimating unit provides a first frequency change command to the controllable oscillator, so as to correct the first internal frequency according to the first frequency shift value, a second frequency change command to the second frequency shift unit, so as to shift the initially shifted frequency according to the second frequency shift value.
Inventors
- 👤 Doron Rainish
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:18
CPC Classifications
H; H03; H03J; H03J7/00; H03J7/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
209 words
A system for receiving a signal in a received frequency and shifting the received frequency to become a desired frequency, the system comprising: a. a controllable oscillator for generating a first internal frequency, b. a frequency estimating unit connected to said controllable oscillator, c. a first frequency shift unit, connected to said controllable oscillator and to said frequency estimating unit, for shifting said received frequency according to said first internal frequency, thereby obtaining an initially shifted frequency; and d. a second frequency shift unit connected to said first frequency shift unit and said frequency estimating unit for shifting said initially shifted frequency, e. said frequency estimating unit including: f. means for determining a total frequency shift value from said desired frequency, said received frequency and said first internal frequency; g. means for determining a first frequency shift value and a second frequency shift value from said total frequency shift value, h. means for providing a first frequency change command to said controllable oscillator, so as to correct said first internal frequency according to said first frequency shift value, and i. means for providing a second frequency change command to said second frequency shift unit, so as to shift said initially shifted frequency according to said second frequency shift value.
Claim 2
Independent Claim
209 words
A system for receiving a signal in a received frequency and shifting the received frequency to become a desired frequency, the system comprising: a. a controllable oscillator for generating a first internal frequency, b. a frequency estimating unit connected to said controllable oscillator, c. a first frequency shift unit, connected to said controllable oscillator and to said frequency estimating unit, for shifting said received frequency according to said first internal frequency, thereby obtaining an initially shifted frequency; and d. a second frequency shift unit connected to said first frequency shift unit and said frequency estimating unit for shifting said initially shifted frequency, e. said frequency estimating unit including: f. means for determining a total frequency shift value from said desired frequency, said received frequency and said first internal frequency; g. means for determining a first frequency shift value and a second frequency shift value from said total frequency shift value, h. means for providing a first frequency change command to said controllable oscillator, so as to correct said first internal frequency according to said first frequency shift value, and i. means for providing a second frequency change command to said second frequency shift unit, so as to shift said initially shifted frequency according to said second frequency shift value.
Claim 3
Dependent Claim
25 words
A system according to claim 1 wherein said frequency estimating unit provides said first frequency change command to said controllable oscillator as an electrical voltage.
Claim 4
Dependent Claim
16 words
A system according to claim 1 wherein said second frequency shift unit is a hardware unit.
Claim 5
Dependent Claim
16 words
A system according to claim 1 wherein said second frequency shift unit is a software unit.
Claim 6
Dependent Claim
37 words
A system according to claim 1 wherein said second frequency shift unit includes means for performing a frequency shift by multiplying said initially shifted frequency by e j2 πΔf, wherein Δf is said second frequency shift value.
Claim 7
Dependent Claim
41 words
A system according to claim 1 wherein said controllable oscillator generates a second internal frequency, the system further comprising a first output frequency shift unit, connected to said controllable oscillator for shifting a transmittable signal according to said second internal frequency.
Claim 8
Dependent Claim
82 words
A system according to claim 6 further comprising a second output frequency shift unit connected before said first output frequency shift unit and to said frequency estimating unit, wherein said frequency estimating unit provides a command to said second output frequency shift unit to shift said transmittable signal according to said second frequency shift value thereby producing an initially shifted transmittable signal, and wherein said first output frequency shift unit shifts said initially shifted transmittable signal according to said second internal frequency.
Claim 9
Dependent Claim
195 words
In a system generating a controllable internal frequency f IN , a method for shifting a signal from an initial frequency f S towards a desired frequency f D to a final frequency f F , wherein |f D -f F | is less than a predetermined allowed frequency error f ALLOWED , the method comprising the steps of: a. determining a total frequency shift value f TOTAL according to said internal frequency f IN and said initial frequency value f S ; b. determining a first frequency shift value Δf 1 from said total frequency shift value f TOTAL and said predetermined allowed frequency error f ALLOWED ; c. determining a second frequency shift value Δf 2 from said total frequency shift value f TOTAL and said first frequency shift value Δf 1 ; d. adjusting said internal frequency f IN according to said first frequency shift value Δf 1 thereby shifting said initial frequency f S so as to produce a shifted initial frequency f SHIFTED ; and e. shifting said shifted initial frequency f SHIFTED according to said second frequency shift value Δf 2 thereby producing said final frequency f F .
Claim 10
Dependent Claim
195 words
In a system generating a controllable internal frequency f IN , a method for shifting a signal from an initial frequency f S towards a desired frequency f D to a final frequency f F , wherein |f D -f F | is less than a predetermined allowed frequency error f ALLOWED , the method comprising the steps of: a. determining a total frequency shift value f TOTAL according to said internal frequency f IN and said initial frequency value f S ; b. determining a first frequency shift value Δf 1 from said total frequency shift value f TOTAL and said predetermined allowed frequency error f ALLOWED ; c. determining a second frequency shift value Δf 2 from said total frequency shift value f TOTAL and said first frequency shift value Δf 1 ; d. adjusting said internal frequency f IN according to said first frequency shift value Δf 1 thereby shifting said initial frequency f S so as to produce a shifted initial frequency f SHIFTED ; and e. shifting said shifted initial frequency f SHIFTED according to said second frequency shift value Δf 2 thereby producing said final frequency f F .
Claim 11
Dependent Claim
34 words
A method according to claim 8 wherein the sum of said first frequency shift value Δf 1 and said second frequency shift value Δf 2 equals said total frequency shift value f TOTAL .
Claim 12
Dependent Claim
32 words
A method according to claim 8 wherein said first frequency shift value Δf 1 defines a frequency error f ERROR which is less than said predetermined allowed frequency error f ALLOWED .
References Cited (Backward Citations)
US4587483A
Cited
US4921467A
Cited
US5115515A
Cited
US5170492A
Cited
US5335354A
Cited
US5661440A
Cited
US5706315A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2003-11-07 | 2004-05-08 | 2004-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-11-07 | 2008-05-08 | 2008-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-11-07 | 2012-05-08 | 2012-11-07 | $7700.00 | Window Closed / Lapsed |