Frequency channel programmable LC_digitally controlled oscillator (DCO) circuit structure

A circuit structure and frequency band technology, applied in the field of programmable LC_DCO circuit structure, can solve the problems of large implementation area and large inductance area of ​​the VCO parallel structure, and achieve the effect of strong design flexibility, reduced implementation area, and reduced implementation difficulty.

Active Publication Date: 2013-02-13
CHANGSHA JINGJIA MICROELECTRONICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the mutual coupling between the various VCOs in this structure during normal operation, phase noise will be introduced. At the same time, due to the large area of ​​the inductor, the parallel structure of multiple VCOs achieves a large area.

Method used

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  • Frequency channel programmable LC_digitally controlled oscillator (DCO) circuit structure
  • Frequency channel programmable LC_digitally controlled oscillator (DCO) circuit structure
  • Frequency channel programmable LC_digitally controlled oscillator (DCO) circuit structure

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Embodiment Construction

[0029] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

[0030] As shown in Fig. 6, the present invention is a frequency-band programmable LC_DCO circuit structure, which is characterized in that it is composed of a programmable negative resistance module complementary to a cross-coupled tailless current source, a programmable inductance structure and a switched capacitor array.

[0031] The cross-coupled tailless current source complementary programmable negative resistance circuit structure is characterized in that the cross-coupled tailless current source complementary negative resistance circuit includes two P-type transistors MP1 and MP2, two N-type transistors MN1 and MN2, the gate of the transistor MP1 and the gate of the transistor MN1 are connected to the output terminal OUTBAR, the drain of the transistor MP1 and the drain of the transistor MN1 are connected to the output terminal ...

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Abstract

The invention discloses a frequency channel programmable LC_digitally controlled oscillator (DCO) circuit structure. An LC_DCO circuit comprises a cross-coupling tailless current source complementary programmable negative resistance module, a programmable inductor module and switched capacitor arrays. Firstly, inductors with different inductance values are selected to form a resonant cavity with a natural capacitor; then, current of a left branch circuit and a right branch circuit of a negative resistance circuit is modulated to generate negative resistance required for starting oscillation so as to achieve oscillation of an LC_DCO; and finally, effective capacitance values which are switched in the resonant cavity by the two different switched capacitor arrays are controlled, so that modulation of operating frequency ranges and tuning accuracy is achieved. The circuit structure has the characteristics of being programmable in output frequency channel and adjustable in tuning accuracy and the advantages of being small in achievement area, high in integration level and high in deign flexibility.

Description

technical field [0001] The invention mainly relates to a DCO circuit structure, in particular to a programmable LC_DCO circuit structure. Background technique [0002] With the rapid development of the radio frequency communication market, the demand for high performance radio frequency (RF) circuits is increasing day by day. In the design of a single-chip RF integrated transceiver system, one of the biggest challenges is the design of a high-performance oscillator, that is, an oscillator with low phase noise and a wide frequency range. LC_VCO is widely used in CMOS transceivers or data communications due to its better phase noise performance than ring VCO. It is mainly composed of LC resonant tank and negative resistance circuit. [0003] Generally, for the realization of wideband frequency LC_VCO, it mainly adopts the mode of capacitor array, inductor array and multiple VCOs in parallel. In actual circuits, capacitor arrays and multiple VCOs are used in parallel. This is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/12
Inventor 郭斌
Owner CHANGSHA JINGJIA MICROELECTRONICS
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