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Annular voltage-controlled oscillator circuit

A technology of voltage-controlled oscillators and circuits, applied in the direction of electrical components, automatic power control, etc., can solve problems such as excessive capacitor area, complex power supply noise suppression unit circuit, etc.

Active Publication Date: 2016-11-23
SEMICON MFG INT (SHANGHAI) CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The purpose of this application is to provide a ring voltage-controlled oscillator circuit to solve the problems in the prior art that the circuit of the power supply noise suppression unit is relatively complex, has too many capacitors and has a large area

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[0027] It should be pointed out that the following detailed description is exemplary and intended to provide further explanation to the present application. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

[0028] It should be noted that the terminology used here is only for describing specific implementations, and is not intended to limit the exemplary implementations according to the present application. As used herein, unless the context clearly dictates otherwise, the singular is intended to include the plural, and it should also be understood that when the terms "comprising" and / or "comprising" are used in this specification, they mean There are features, steps, operations, means, components and / or combinations thereof.

[0029] For the convenience of description, spatially relative terms may be used here, such as "on ...", "over .....

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Abstract

The invention provides an annular voltage-controlled oscillator circuit. The oscillator circuit comprises a noise suppression unit for suppressing power supply noise, and an oscillation unit, wherein the noise suppression unit comprises a first PMOS (P-channel Metal Oxide Semiconductor) transistor, a second PMOS transistor and an amplifier; the first PMOS transistor comprises a first grid electrode, a first drain electrode and a first source electrode; the first source electrode is connected with a power supply end; the first grid electrode is connected with a voltage control end; the second PMOS transistor comprises a second grid electrode, a second drain electrode and a second source electrode; the second source electrode is connected with the first drain electrode; the second drain electrode is connected with a voltage end of the oscillation unit; a positive-phase input end of the amplifier is connected with the voltage control end; a reversed input end of the amplifier is connected with the second source electrode or the second grid electrode; and an output end of the amplifier is connected with the second grid electrode. Through adoption of the annular voltage-controlled oscillator circuit, the power supply rejection ratio is increased; devices consuming chip area such as a capacitor are not included; and the effect of suppressing the power supply noise is achieved through the noise suppression unit with a simple structure.

Description

technical field [0001] The present application relates to the field of semiconductor integrated circuits, in particular, to a ring voltage-controlled oscillator circuit. Background technique [0002] Phase Locked Loop (PLL) is the core circuit in communication systems, clock chips and various SOCs. Spectral noise, jitter and other indicators of its output signal are very critical, directly affecting the overall performance of the system. [0003] Voltage-Controlled Oscillator (Voltage-Controlled Oscillator, VCO) is the core module in the PLL, when its input voltage changes within a certain range, its output terminal can get a voltage signal with continuously variable frequency. The ring voltage-controlled oscillator is a more important type of VCO. By connecting the delay unit circuit (commonly implemented by an inverter) end-to-end to form a feedback loop to generate a stable oscillating voltage waveform, the phase-locked loop is used to adjust the control voltage. The out...

Claims

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Application Information

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IPC IPC(8): H03L7/099
Inventor 贾海珑
Owner SEMICON MFG INT (SHANGHAI) CORP
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