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Voltage to Current Converter

A current converter and voltage technology, applied in the direction of electrical components, automatic power control, etc., can solve the problems of reducing output resistance, large circuit area, and high cost, and achieve the effect of reducing current jitter, saving costs, and improving the inhibition effect.

Inactive Publication Date: 2016-04-27
SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to overcome the problem of large circuit area and high cost in the prior art, the main purpose of the present invention is to provide a voltage-current converter, which can effectively reduce the output resistance through a super source follower combined with a current mirror circuit to obtain a better power supply Rejection ratio eliminates the need for an external low-dropout regulator to suppress power supply noise, reducing cost

Method used

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Embodiment Construction

[0018] The implementation of the present invention is described below through specific examples and in conjunction with the accompanying drawings, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. The present invention can also be implemented or applied through other different specific examples, and various modifications and changes can be made to the details in this specification based on different viewpoints and applications without departing from the spirit of the present invention.

[0019] figure 2 It is a circuit structure diagram of a preferred embodiment of a voltage-current converter of the present invention. Such as figure 1 As shown, in a preferred embodiment of the present invention, the voltage-current converter of the present invention is used in a voltage-controlled oscillator (VCO). The voltage-current converter of the present invention includes: a super s...

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Abstract

The invention discloses a voltage-current converter which comprises a super source follower and a current mirror circuit. Output resistance can be reduced by combining the super source follower and the current mirror circuit, current is fed back to the super source follower by the current mirror circuit to stabilize the super source follower so as to realize the lower resistance of the output end of the voltage-current converter, and therefore, very high power rejection ratio can be achieved, and power noise can be inhibited very well. The voltage-current converter can omit an external low dropout voltage regulator circuit required in a traditional structure, save a large area, achieve better power noise inhibition effect and improve PLL (Phase Locking Loop) vibration.

Description

technical field [0001] The present invention relates to a voltage-current converter, in particular to a voltage-current converter for a voltage-controlled oscillator. Background technique [0002] As is well known in the art, a voltage-to-current converter is used to convert an input voltage into an output current proportional thereto. For example, a voltage-current converter is usually used in a voltage-controlled oscillator (generally abbreviated as VCO) in a phase-locked loop circuit. [0003] figure 1 A circuit diagram of a voltage-to-current converter often used in voltage-controlled oscillators. Such as figure 1 As shown, the traditional voltage-current converter mainly realizes the conversion of voltage to current through an N-type MOS transistor and a current mirror, which includes a current mirror 10 and an N-type MOS transistor M8, and the current mirror 10 is composed of a P-type MOS Transistors (P1, P2), according to their working principle, the output curren...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099
Inventor 任铮周伟胡少坚唐逸
Owner SHANGHAI INTEGRATED CIRCUIT RES & DEV CENT
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