CMOS digital control LC oscillator on chip |
Title: |
CMOS digital control LC oscillator on chip |
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Application Number: |
200610011678 |
Application Date: |
2006/04/14 |
Announcement Date: |
2006/09/13 |
Pub. Date: |
2007/08/22 |
Publication Number: |
1832333 |
Announcement Number: |
1333522 |
Grant Date: |
2007-8-22 |
Granted Pub. Date: |
2007-8-22 |
ApplicationType: |
Invention |
State/Country: |
11[China|beijing] |
IPC: |
H03B 5/12, H03L 7/099 |
Applicant(s): |
Tsinghua Univ. |
Inventor(s): |
Wang Shaohua, Yang Huazhong |
Key Words: |
CMOS, digital control, LC oscillator, chip |
Abstract: |
This invention relates to a design technology for chips of T-R devices of the wireless communication system characterizing in applying a double-mode step-forward method composed of an technology-voltage-temperature calibration mode and a locking mode to get the assigned output oscillation frequency step by step, in which, in the calibration mode, a MIM switch condenser array controlled by digital signals is applied for frequency rough calibration in a rather wide sphere and in the locking mode, a MOS condenser matrix combining with a modulation mode of high speed digit sigma delta controlled by digital signals is applied to get an accurate output oscillation frequency in a rather wide sphere, especially a coupling mode of an improved MOS variable-capacitance diode is applied to reduce the sensitivity of oscillators to noises, at the same time, a sigma delta modulator of a single-step three-stages feedforward structure is applied to reduce the stray in output signals and a fixed differential capacitor of certain capacitance values is parallel to both ends of the variable-capacitance control circuit to reduce the phase noise of the oscillator and improve the linearity of frequency adjustment. |
Claim: |
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Priority: |
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PCT: |
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