CMOS digital control LC oscillator on chip

A technology of oscillators and oscillation circuits, applied in power oscillators, automatic power control, electrical components, etc., can solve the problems of unsuitable numerically controlled LC oscillators and unsuitable voltage controlled oscillators

Inactive Publication Date: 2006-09-13
TSINGHUA UNIV
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Problems solved by technology

[0007] To sum up, traditional voltage-controlled oscillators are not suitable for the current development trend of deep submicron technology and system integration, and will face more and more

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  • CMOS digital control LC oscillator on chip
  • CMOS digital control LC oscillator on chip
  • CMOS digital control LC oscillator on chip

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Embodiment Construction

[0057] The technical solution of the present invention is: to improve the circuit structure of the commonly used voltage-controlled LC oscillator, and discretely control the capacitance value of the LC oscillation circuit by inputting a digital signal, so as to output a specified oscillation frequency. In the LC oscillation circuit, the oscillation frequency is determined by the following formula:

[0058] f out = 1 2 π LC , - - - ( 1 )

[0059] where f out is the oscillation frequency of the LC oscillation circuit, L is the loop inductance value, and C is the loop capacitance value. It can be seen from formula (1) that if the capacitance value in the oscillating circuit can be changed correspondingly according to the input digital signal, the...

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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.

Description

technical field [0001] The invention relates to a novel on-chip CMOS digitally controlled LC oscillator, which is especially suitable for the design of CMOS integrated chips for TD-SCDMA and PHS transceivers, and can also be applied to the design of transceiver chips for wireless communication systems such as WCDMA and CDMA2000. Background technique [0002] TD-SCDMA Time Division Synchronous Code Division Multiple Access standard is a new technology with independent intellectual property rights proposed by China. The wireless transmission scheme of TD-SCDMA flexibly integrates basic transmission methods such as FDMA, TDMA and CDMA. In May 2000, the International Telecommunication Union (ITU) wrote the three mainstream wireless interface standards of WCDMA, CDMA2000 and TD-SCDMA into the 3G (Third Generation Mobile Communications) technical guidance document "International Mobile Communications Plan 2000" (referred to as IMT-2000). TD-SCDMA integrates today's leading intern...

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Application Information

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IPC IPC(8): H03B5/12H03L7/099
Inventor 王少华杨华中
Owner TSINGHUA UNIV
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