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VCO circuit

A circuit and resistance technology, applied in the field of electronics, can solve the problems such as inability to filter by filter, increase design complexity, etc., and achieve the effect of reducing influence, improving suppression ability, and increasing range

Active Publication Date: 2019-05-31
BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Also, due to loop bandwidth requirements, these noises cannot be filtered out with filters
In terms of power supply noise suppression capability improvement, Figure 1b , Figure 1c In the corresponding embodiment, the main disadvantage is also the addition of additional circuits, which increases the design complexity and introduces noise sources

Method used

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Embodiment Construction

[0019] The embodiments of the present application provide a VCO circuit, which is used to increase the range of the VCO control voltage and improve the VCO's ability to suppress noise and interference of the power supply voltage without adding additional circuits.

[0020] The terms "first", "second", "third", "fourth", etc. (if any) in the description and claims of this application and the above-mentioned drawings are used to distinguish similar objects, without having to use To describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments described herein can be implemented in an order other than the content illustrated or described herein. In addition, the terms "including" and "having" and any variations of them are intended to cover non-exclusive inclusions. For example, a process, method, system, product, or device that includes a series of steps or units is not neces...

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Abstract

The embodiment of the invention discloses a VCO circuit which is used for widening the range of VCO control voltage and improving the inhibition capability of VCO on power supply voltage noise and interference. The VCO circuit in the embodiment of the invention comprises a filter module, a voltage and current conversion module and a CCO module. One end of a first filter in the filter module and one end of a second filter in the filter module are connected to a first node, the first node is connected with a control voltage, the other end of the first filter is connected to a power supply, and the other end of the second filter is connected to the ground. A grid electrode of a first MOS transistor and a grid electrode of a second MOS transistor in the voltage and current conversion module are connected to a second node. The second node is connected with the first node. The drain electrode of the first MOS transistor and the drain electrode of the second MOS transistor are connected to athird node, and the third node is connected with the CCO module. The source electrode of the first MOS transistor is connected with one end of the first resistor, and the other end of the first resistor is connected with the ground. The source electrode of the second MOS transistor is connected with one end of the second resistor, and the other end of the second resistor is connected with the power supply.

Description

Technical field [0001] This application relates to the field of electronics, and in particular to a VCO circuit. Background technique [0002] A voltage controlled oscillator (VCO) is an essential module in a phase-locked loop. In the baseband phase-locked loop, the commonly used structure is a current-controlled ring-shaped complementary metal oxide semiconductor (CMOS) VCO. In low-voltage and low-power applications, the input control voltage range of the VCO with this structure is relatively small, and the frequency adjustment range required by the VCO cannot be reduced, which leads to an increase in the gain of the VCO, and the overall noise performance of the phase-locked loop deteriorates. In addition, the actual power supply for the VCO usually comes from an on-chip low dropout regulator (LDO) to isolate interference from the power supply. However, in low-voltage and low-power applications, the power supply rejection capability and output noise performance of the LDO will...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 高鹏乔峻石赖玠玮
Owner BEIJING SPREADTRUM HI TECH COMM TECH CO LTD
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