US 11,558,012 B2Granted

Oscillator and method of driving the same

AssigneeLx Semicon Co., Ltd.

InventorsYoung Ho Seo, Seung Hun Shin, Kyu Ho Kim, Won Joon Hwang

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Abstract

The present disclosure relates to an oscillator including a charge and discharge circuit which generates a first oscillation signal according to a clock signal using a first constant current and a second oscillation signal according to an inverted clock signal using a second constant current, an integrating circuit which generates a first comparison voltage reflecting an amount of change in the first oscillation signal based on a comparison reference voltage and a second comparison voltage reflecting an amount of change in the second oscillation signal based on the comparison reference voltage, and a comparison circuit which generates the clock signal and the inverted clock signal according to a result of comparison between the first oscillation signal and the first comparison voltage and a result of comparison between the second oscillation signal and the second comparison voltage.

Claims14

Dependent claims

An oscillator comprising:

a charge and discharge circuit which generates a first oscillation signal according to a clock signal using a first constant current and a second oscillation signal according to an inverted clock signal using a second constant current;
an integrating circuit which generates a first comparison voltage reflecting an amount of change in the first oscillation signal based on a comparison reference voltage and a second comparison voltage reflecting an amount of change in the second oscillation signal based on the comparison reference voltage;
and
a comparison circuit which generates the clock signal and the inverted clock signal according to a result of comparison between the first oscillation signal and the first comparison voltage and a result of comparison between the second oscillation signal and the second comparison voltage,
wherein the integrating circuit includes:
a first integrator which generates the first comparison voltage by integrating a difference between the first oscillation signal and the comparison reference voltage;
and
a second integrator which generates the second comparison voltage by integrating a difference between the second oscillation signal and the comparison reference voltage.

5 more elements

A method of driving an oscillator, comprising:

generating a first constant current and a second constant current using a bias current;
generating a first oscillation signal according to a clock signal using the first constant current and generating a second oscillation signal according to an inverted clock signal using the second constant current;
generating a first comparison voltage reflecting an amount of change in the first oscillation signal based on a comparison reference voltage and generating a second comparison voltage reflecting an amount of change in the second oscillation signal based on the comparison reference voltage;
and
generating the clock signal and the inverted clock signal according to a result of comparison between the first oscillation signal and the first comparison voltage and a result of comparison between the second oscillation signal and the second comparison voltage,
wherein generating the first comparison voltage and the second comparison voltage comprises:
generating, by a first integrator, the first comparison voltage by integrating a difference between the first oscillation signal and the comparison reference voltage;
and
generating, by a second integrator, the second comparison voltage by integrating a difference between the second oscillation signal and the comparison reference voltage.

6 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/546,357Filed 9 Dec 2021
Priority: KR 10-2020-017600416 Dec 2020
Published: US 2022/0190783 A116 Jun 2022
Granted: 17 Jan 2023
Term ends: Not estimatedThe source records don’t support an estimate.

Classification7 codes

H03B 19/08
By means of discharge device or semiconductor device with more than two electrodes: by means of a discharge device
H03B 19/20
Using uncontrolled rectifying devices, e.g. rectifying diodes or Schottky diodes: being diodes exhibiting charge storage or enhancement effects
H03K 3/011
Details: modifications of generator to compensate for variations in physical values, e.g. voltage, temperature
H03K 3/0231
By the use of differential amplifiers or comparators, with internal or external positive feedback: astable circuits