Method and circuit for exciting a crystal oscillation circuit

Patent metadata

Field	Value
Publication number	US-10348244-B2
Application number	US-201715635635-A
Country	US
Kind code	B2
Filing date	Jun 28, 2017
Priority date	May 16, 2017
Publication date	Jul 9, 2019
Grant date	Jul 9, 2019

Abstract

A method and a circuit for exciting a crystal oscillation circuit are disclosed herein. The crystal oscillation circuit comprising: charging, with a charging circuit, a voltage-controlled oscillator; providing, with the voltage-controlled oscillator, an exciting signal; blocking, with a direct current blocking capacitor, direct current from the voltage-controlled oscillator to the crystal oscillation circuit; and exciting, with the exciting signal, the crystal oscillation circuit. The circuit for exciting a crystal oscillation circuit, comprising: a charging circuit; a voltage-controlled oscillator coupled to the charging circuit and configured to provide an exciting signal to the crystal oscillation circuit; and a direct current blocking capacitor connected between the voltage-controlled oscillator and the crystal oscillation circuit and configured to block direct current from the voltage-controlled oscillator.

First claim

What is claimed is:

1. A method for exciting a crystal oscillation circuit, comprising:
charging, with a charging circuit, a voltage-controlled oscillator;
providing, with the voltage-controlled oscillator, an exciting signal;
blocking, with a direct current blocking capacitor, direct current from the voltage-controlled oscillator to the crystal oscillation circuit; and
exciting, with the exciting signal, the crystal oscillation circuit, wherein the crystal oscillation circuit is external to the voltage-controlled oscillator.

2. The method of claim 1 , wherein the charging circuit further comprises a resistor and a capacitor, and wherein the capacitor is connected in parallel to the resistor via a switch.

3. The method of claim 2 , wherein an output voltage of the charging circuit is linear voltage increasing from 0.

4. The method of claim 3 , wherein frequency of the voltage-controlled oscillator varying with the output voltage of the charging circuit and an oscillation frequency of the crystal oscillation circuit falls within a frequency range from a minimum frequency of the voltage controlled oscillator to a maximum frequency of the voltage controlled oscillator.

5. The method of claim 1 , wherein the crystal oscillation circuit further comprises an output clock connected to the voltage-controlled oscillator and configured to control an oscillation time for the voltage-controlled oscillator.

6. A circuit for exciting a crystal oscillation circuit, comprising:
a charging circuit;
a voltage-controlled oscillator coupled to the charging circuit and configured to provide an exciting signal to the crystal oscillation circuit; and
a direct current blocking capacitor connected between the voltage-controlled oscillator and the crystal oscillation circuit and configured to block direct current from the voltage-controlled oscillator, wherein the crystal oscillation circuit is external to the voltage-controlled oscillator.

7. The circuit of claim 6 , wherein the charging circuit further comprises a resistor and a capacitor, and wherein the capacitor is connected in parallel to the resistor via a switch.

8. The circuit of claim 7 , wherein an output voltage of the charging circuit is linear voltage increasing from 0.

9. The circuit of claim 8 , wherein frequency of the voltage-controlled oscillator varying with the output voltage of the charging circuit and an oscillation frequency of the crystal oscillation circuit falls within a frequency range from a minimum frequency of the voltage controlled oscillator to a maximum frequency of the voltage controlled oscillator.

10. The circuit of claim 6 , wherein the crystal oscillation circuit further comprises an output clock connected to the voltage-controlled oscillator and configured to control an oscillation time for the voltage-controlled oscillator.

Assignees

• Beken Corp

Inventors

• Liu Jiazhou
• Zhao Yunfeng
• Guo Dawei

Classifications

• H03B2200/0008

  Colpitts oscillator · CPC title

• H03B5/30 Primary

  with frequency-determining element being electromechanical resonator · CPC title

• H03B2200/008

  making use of a reference frequency · CPC title

• H03B2200/0012

  Pierce oscillator · CPC title

• H03B2201/0275

  the means delivering several selected voltages or currents · CPC title