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High-resolution oscillator having wide frequency range

An oscillator and power technology, applied in the field of voltage-controlled oscillators, can solve problems such as difficulty in meeting jitter margins, high energy consumption, and increased VCO power consumption.

Active Publication Date: 2017-01-25
LATTICE SEMICON CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditionally, high-frequency VCOs that meet the low noise / jitter criteria specified by the communication protocol are either power-hungry or only support narrow-band frequencies
For example, an LC tank VCO produces relatively low phase noise at high frequencies, but has a narrow frequency range
On the other hand, high frequency, wideband ring VCOs are power hungry and difficult to meet jitter margins
In addition, the ring VCO is characterized by a dedicated, op-amp based regulator to provide low supply sensitivity, which further increases the VCO power dissipation

Method used

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  • High-resolution oscillator having wide frequency range
  • High-resolution oscillator having wide frequency range
  • High-resolution oscillator having wide frequency range

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Embodiment Construction

[0013] Detailed illustrative embodiments of the invention are disclosed herein. However, specific structural and functional details disclosed herein are merely representative for purposes of describing example embodiments of the present invention. The invention may be embodied in many alternative forms and should not be limited to the embodiments set forth herein. Also, the terminology used herein is for the purpose of describing specific embodiments only and is not limited to the exemplary embodiments of the present invention.

[0014] As used herein, the singular form "a" and "an" are intended to include plural forms unless expressly specified otherwise. It should also be understood that the terms "comprising" and / or "comprising" indicate the presence of the indicated features, steps or components, but do not exclude the presence or addition of one or more other features, steps or components. It should also be noted that in some alternative implementations, the functions / a...

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Abstract

The invention relates to a high-resolution oscillator having a wide frequency range. In one embodiment, a voltage-controlled oscillator has a ring of delay stages and power-regulating circuitry regulating power to each delay stage. Each delay stage has at least one inverter having a leg having a current regulator that controls current flowing through the leg and thereby controlling gain of the delay stage. The VCO receives three control signals that affect the amount of delay applied by each delay stage and therefore the VCO output frequency: a first applied to control the power-regulating circuitry, a second applied to at least one transistor gate in the current regulator, and a third applied to at least one transistor body in the current regulator. The power-regulating circuitry has a parallel configuration of a power-regulating transistor, a first capacitor, and a switched-capacitor leg having a second capacitor and a switch for controlling settling time. The capacitors regulate the power supply without a dedicated, opamp-based voltage regulator.

Description

technical field [0001] This invention relates to the electronics industry and, more particularly, to voltage controlled oscillators. Background technique [0002] This section introduces aspects that may help to better understand the invention. Accordingly, the statements in this section are read in this light and should not be construed as statements as to what is or is not prior art. [0003] Voltage controlled oscillators (VCOs) are widely used in the semiconductor industry, such as transceivers for clock and data recovery (CDR) circuits and phase locked loop (PLL) circuits. For example, VCOs are expected to have a wide adjustable frequency range to support various communication protocols while still maintaining low power, low noise, and low supply sensitivity. [0004] Traditional VCOs have an adjustable output frequency as a function of input voltage or current. Traditionally, high-frequency VCOs that meet the low noise / jitter criteria specified by the communication ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H03K3/012H03K3/03
CPCH03K3/012H03K3/0315H03K3/0322
Inventor V·霍M·贾亚拉姆H·彻泽尔D·李
Owner LATTICE SEMICON CORP