Claims
- 1. A voltage control oscillator (VCO) comprising:
an L-C tank circuit; a negative resistance generator operational to oscillate at a frequency determined by the L-C tank circuit, the L-C tank circuit and the negative resistance generator together forming a VCO core; and a VCO core current source comprising at least one passive resistor, and devoid of capacitors, inductors and active components.
- 2. The VCO according to claim 1, wherein the negative resistance generator comprises at least one pair of cross-coupled CMOS transistors.
- 3. The VCO according to claim 1, further comprising a CMOS transistor configured to act as a capacitor and to provide filtering of VCO power supply noise.
- 4. The VCO according to claim 1, further comprising a CMOS transistor in series with the at least one passive resistor, and operational to selectively turn the VCO core on and off.
- 5. The VCO according to claim 1, further comprising a CMOS transistor in series with each of the at least one passive resistors, wherein the series CMOS transistors together are configured to selectively control the VCO core bias current.
- 6. A voltage control oscillator (VCO) comprising:
a tuning circuit; a negative resistance generator operational to oscillate at a frequency determined by the tuning circuit, the tuning circuit and the negative resistance generator together forming a VCO core; and a VCO core current source comprising at least one passive resistor, and devoid of capacitors, inductors and active components, wherein the current source operates to provide a VCO bias current.
- 7. The VCO according to claim 6, wherein the tuning circuit comprises an L-C tank circuit.
- 8. The VCO according to claim 6, wherein the negative resistance generator comprises at least one pair of cross-coupled CMOS transistors.
- 9. The VCO according to claim 6, further comprising a CMOS transistor configured to act as a capacitor and to provide VCO bias current noise filtering.
- 10. The VCO according to claim 6, further comprising a CMOS transistor in series with the at least one passive resistor, and operational to selectively turn the VCO core on and off.
- 11. The VCO according to claim 6, further comprising a CMOS transistor in series with each of the at least one passive resistors, wherein the series CMOS transistors together are configured to selectively pass a bias current through its respective passive resistor to control the VCO core bias current.
- 12. A voltage control oscillator (VCO) comprising:
oscillating means for oscillating at a desired frequency; tuning means for controlling the desired frequency, the oscillating means and the tuning means together forming a VCO core; biasing means for providing a VCO core bias current, wherein the biasing means is devoid of capacitors, inductors and active components.
- 13. The VCO according to claim 12, wherein the oscillating means comprises a negative resistance generator.
- 14. The VCO according to claim 12, wherein the oscillating means comprises at least one pair of cross-coupled CMOS transistors.
- 15. The VCO according to claim 12, wherein the tuning means comprises a tank circuit.
- 16. The VCO according to claim 15, wherein the tank circuit is an L-C tank circuit.
- 17. The VCO according to claim 12, wherein the biasing means comprises a single passive resistor.
- 18. The VCO according to claim 17, further comprising at least one CMOS transistor configured to act as a capacitor and to provide filtering of VCO power supply noise.
- 19. The VCO according to claim 17, further comprising a CMOS transistor in series with the single passive resistor, and operational to selectively turn the VCO core on and off.
- 20. The VCO according to claim 12, wherein the biasing means comprises a plurality of passive resistors.
- 21. The VCO according to claim 20, further comprising a CMOS transistor in series with each passive resistor, wherein the series CMOS transistors together are configured to selectively activate the passive resistors to control the VCO core bias current.
- 22. A method of controlling a voltage control oscillator (VCO) phase noise, the method comprising the steps of:
providing a VCO core; and generating a self-bias current for the VCO core via a resistor bias current source that is devoid of capacitors, inductors and active components.
- 23. The method according to claim 22, further comprising the steps of:
providing means for programming the resistor bias current source; and programming the resistor bias current source to selectively control the bias current to the VCO core.
CLAIM TO PRIORITY OF PROVISIONAL APPLICATION
[0001] The application claims priority under 35 U.S.C. § 119(e)(1) of provisional application Ser. No. 60/458,859, attorney docket number TI-36131PS, entitled Low-Current, Area-Efficient and Flicker Noise Free Bias CMOS Voltage Control Oscillator, filed Mar. 28, 2003, by Abdellatif Bellaouar and See Taur Lee.
Provisional Applications (1)
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Number |
Date |
Country |
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60458859 |
Jun 2003 |
US |