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Voltage-to-current converter and voltage controlled oscillator

A current converter and voltage technology, applied in the fields of voltage-to-current converters, voltage-to-current converters and voltage-controlled oscillators, can solve the problems of inability to cover the input range, rising manufacturing costs, etc., to prevent noise and power supply problems , the effect of low cost and low circuit structure

Inactive Publication Date: 2014-04-16
MEDIATEK SINGAPORE PTE LTD SINGAPORE
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that the manufacturing cost will increase significantly since the technology requires a digital calibration process
Another VCO with a linear input voltage characteristic can also have the above-mentioned small gain characteristics without using digital calibration, but the disadvantage of this method is that the linear range of this type of VCO cannot cover the entire input range

Method used

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  • Voltage-to-current converter and voltage controlled oscillator
  • Voltage-to-current converter and voltage controlled oscillator
  • Voltage-to-current converter and voltage controlled oscillator

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Embodiment Construction

[0012] Certain terms are used in the specification and following claims to refer to particular elements. Those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This description and the subsequent claims do not use the difference in name as the way to distinguish components, but use the difference in function of the components as the criterion for distinguishing. "Includes" mentioned throughout the specification and subsequent claims is an open-ended term, so it should be interpreted as "including but not limited to". In addition, the term "coupled" should be construed herein to include any direct and indirect means of electrical connection. Therefore, if it is described that a first device is coupled to a second device, it means that the first device may be directly electrically connected to the second device, or indirectly electrically connected to the second device through other devices or connection means.

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Abstract

The present invention provides a voltage-to-current converter and a voltage controlled oscillator. The voltage-to-current converter is used for converting an input voltage to generate an output current, and includes an input terminal, a resistor, a current mirror and a current generating circuit, where the input terminal is used for receiving the input voltage; the resistor is coupled to the input terminal; the current mirror is coupled to the resistor and is used for mirroring a reference current to generate a mirrored current, wherein the reference current is formed according to at least a current flowing through the resistor; and the current generating circuit is coupled to the current mirror and is used for generating the output current according to at least the mirrored current. According to the embodiment of the present invention, a small gain can be realized to avoid noise and power supply promotion problem, and also can cover the required frequency range without using a plurality of frequency bands and the digital control / correction. In addition, according to the embodiment of the present invention, all of or a part of input range can be covered linearly by a simple and low-cost circuit structure.

Description

[0001] [Technical Field] The field of the invention relates to a voltage-to-current converter and a voltage-controlled oscillator including the voltage-to-current converter, in particular to a simple Low-cost circuit structures can cover all or most of the input range of voltage-to-current converters and voltage-controlled oscillators. 【Background technique】 [0002] To extend the frequency range and overcome process, voltage, and temperature (PVT) variations, VCOs typically require a large gain. But this larger gain may cause more noise and supply pushing problems, for example caused by increased sensitivity to supply voltage variations. Therefore, in order to solve this problem, a method of providing a set of frequency sub-bands, each sub-band having a relatively small gain relative to a voltage controlled oscillator, is proposed, which can prevent the above-mentioned noise problem and the power-supply pushing problem from occurring. But the downside of this approach is tha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03B5/04
Inventor 章华江
Owner MEDIATEK SINGAPORE PTE LTD SINGAPORE
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