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Current-controlled oscillator (CCO) based PLL

A current, voltage and current technology, applied in the field of phase-locked loops, can solve problems such as bad transmission noise

Active Publication Date: 2013-07-10
TAIWAN SEMICON MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] CCO based PLLs have been proposed but also have high Kvco (e.g., 10GHz / V or more), and their poor transfer noise also requires larger loop filter capacitors (which has the disadvantage of larger area) or Lower charge pump current for PLL bandwidth range requirements

Method used

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  • Current-controlled oscillator (CCO) based PLL
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  • Current-controlled oscillator (CCO) based PLL

Examples

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Embodiment Construction

[0041] The description of the exemplary embodiments should be read in conjunction with the accompanying drawings, which should be considered a part of the entire written description. In the specification, terms such as "coupled", "connected", and "interconnected" with respect to electrical connection and the like refer to a relationship in which structures are directly or indirectly related to another structure through intervening structures, unless explicitly stated otherwise.

[0042] figure 1 An embodiment of a CCO based PLL circuit 100 with analog coarse calibration is shown. The PLL circuit 100 includes an input divider 105 connected to a reference clock signal (refclk). The frequency-divided output signal F from the input divider 105 REF is provided to the phase frequency detector 110. Phase frequency detector 110 also has a feedback signal F connected to feedback divider 135 BCK input terminal. The output of the phase frequency detector 110 is provided to a program...

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Abstract

A PLL circuit includes a phase frequency detector; a programmable charge pump coupled to an output of the phase frequency detector; a loop filter coupled to an output of the charge pump, the loop filter providing a fine tuning voltage; a first voltage-to-current converter, the first voltage-to-current converter providing a fine tuning current corresponding to the fine tuning voltage; a current-controlled oscillator (CCO); a feedback divider coupled to an output of the CCO and an input of the phase frequency detector; and an analog calibration circuit. The analog calibration circuit provides a coarse adjustment current for coarse adjustments to a frequency pivot point for an oscillator frequency of the CCO, wherein the CCO generates a frequency signal at an output responsive to a summed coarse adjustment and fine tuning current, wherein the frequency pivot point is continuously adjustable. The invention also provides a current-controlled oscillator (CCO) based PLL.

Description

technical field [0001] Embodiments discussed herein relate to phase locked loops (PPLs), and more specifically, current controlled oscillator (CCO) based PLLs. Background technique [0002] Phase locked loops are used in various applications such as clock recovery, frequency and phase modulation, and frequency synthesizers. The design uses a voltage-controlled oscillator (VCO) or a current-controlled oscillator (CCO) with an accompanying voltage-to-current (V2I) converter as the central design element of the phase-locked loop, so that the oscillator generates lower) or the output frequency proportional to the input current (in the case of a CCO). [0003] A wide frequency range is required to cover the wide frequency range of locking requirements of modern CPU and system-on-chip (SOC) applications. A typical disadvantage of oscillators is the uncertainty of the output frequency for the applied input due to integrated circuit process variations. This results in the need fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03L7/099H03L7/085
CPCH03L7/099H03L7/102H03L7/104
Inventor 陈建宏黃明杰钟道文林志昌隋彧文薛福隆
Owner TAIWAN SEMICON MFG CO LTD
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