Compensation apparatus and inductor-based apparatus

Patent metadata

Field	Value
Publication number	US-9853648-B2
Application number	US-201514737619-A
Country	US
Kind code	B2
Filing date	Jun 12, 2015
Priority date	Oct 22, 2014
Publication date	Dec 26, 2017
Grant date	Dec 26, 2017

Abstract

A compensation apparatus including a primary circuit and a compensation circuit is provided. The primary circuit provides a first voltage, a second voltage, and a first current flowing through a first inductor. The primary circuit includes the first inductor and a function circuit generating an input signal. The first inductor is coupled between a first terminal with the first voltage and a second terminal with the second voltage. The compensation circuit includes a second inductor and a current source circuit. The second inductor is coupled between a third terminal with a third voltage and a fourth terminal with a fourth voltage. The current source circuit outputs a second current flowing through the second inductor. The current source circuit adjusts a frequency of the input signal. The primary circuit and the compensation circuit are coupled via the first inductor and the second inductor.

First claim

What is claimed is:

1. A compensation apparatus, comprising:
a primary circuit, for providing a first voltage, a second voltage, and a first current, comprising:
a function circuit, for generating an input signal; and
a first inductor, coupled between a first terminal with the first voltage and a second terminal with the second voltage, wherein the first current flows through the first inductor; and
a compensation circuit, comprising:
a second inductor, coupled between a third terminal with a third voltage and a fourth terminal with a fourth voltage, wherein a second current flowing through the second inductor is related to the first current; and
a current source circuit, for outputting the second current to compensate frequency drift of the input signal, wherein the primary circuit and the compensation circuit are coupled via the first inductor and the second inductor.

2. The compensation apparatus according to claim 1 , wherein the function circuit comprises:
an oscillator, for outputting the input signal.

3. The compensation apparatus according to claim 1 , wherein the current source circuit comprises:
a first inducing circuit, for changing inductance of the function circuit by providing a first sub-current.

4. The compensation apparatus according to claim 3 , wherein the first inducing circuit comprises:
a first current source, for outputting a first source current;
a first switch, coupled to the first current source and the third terminal; and
a second switch, coupled to the first current source and the fourth terminal,
wherein the first switch and the second switch receive the first source current and outputs the first sub-current to contribute the second current.

5. The compensation apparatus according to claim 4 , wherein the first inducing circuit further comprises:
a first compensation module, coupled to the second terminal; and
a second compensation module, coupled to the first terminal,
wherein the first compensation module and the second compensation module adjust the first sub-current to contribute the second current.

6. The compensation apparatus according to claim 5 , wherein the first compensation module and the second compensation module are symmetric in structures.

7. The compensation apparatus according to claim 5 , wherein at least one of the first and second compensation modules comprise:
a first resistor, coupled to the second terminal and the first switch; and
a first capacitor, coupled to the first switch and a ground voltage.

8. The compensation apparatus according to claim 1 , wherein the current source circuit comprises:
a second inducing circuit, for changing resistance of the function circuit by providing a second sub-current.

9. The compensation apparatus according to claim 8 , wherein the second inducing circuit comprises:
a second current source, for outputting a second source current;
a first switch, coupled to the second current source and the third terminal; and
a second switch, coupled to the second current source and the fourth terminal,
wherein the first switch and the second switch receive the second source current and outputs the second sub-current to contribute the second current.

10. The compensation apparatus according to claim 9 , wherein the second inducing circuit further comprises:
a first compensation module, coupled to the second terminal; and
a second compensation module, coupled to the first terminal, wherein the first compensation module and the second compensation module adjust the second sub-current to contribute the second current.

11. The compensation apparatus according to claim 10 , wherein the first compensation module and the second compensation module are symmetric in structures.

12. An inductor-based apparatus, for receiving an input signal from a function circuit, comprising:
a first inductor, coupled to the function circuit through a first terminal with a first voltage and a second terminal with a second voltage, wherein a first current flows through the first inductor;
a second inductor, coupled between a third terminal with a third voltage and a fourth terminal with a fourth voltage, wherein a second current flowing through the second inductor is related to the first current; and
a current source circuit, for outputting the second current to compensate frequency drift of the input signal.

13. The inductor-based apparatus according to claim 12 , wherein the function circuit comprises at least one of a digitally controlled oscillator (DCO) and a voltage-controlled oscillator (VCO).

14. The inductor-based apparatus according to claim 12 , wherein the current source circuit comprises:
a first inducing circuit, for changing inductance of the function circuit by providing a first sub-current.

15. The inductor-based apparatus according to claim 14 , wherein the first inducing circuit comprises:
a first current source, for outputting a first source current;
a first switch, coupled to the first current source and the third terminal; and
a second switch, coupled to the first current source and the fourth terminal,
wherein the first switch and the second switch receive the first source current and outputs the first sub-current to contribute the second current.

16. The inductor-based apparatus according to claim 15 , wherein the first inducing circuit further comprises:
a first compensation module, coupled to the second terminal; and
a second compensation module, coupled to the first terminal,
wherein the first compensation module and the second compensation module adjust the first sub-current to contribute the second current.

17. The inductor-based apparatus according to claim 16 , wherein at least one of the first and second compensation modules comprise:
a first resistor, coupled to the second terminal and the first switch; and
a first capacitor, coupled to the first switch and a ground voltage.

18. The inductor-based apparatus according to claim 12 , wherein the current source circuit comprises:
a second inducing circuit, for changing resistance of the function circuit by providing a second sub-current.

19. The inductor-based apparatus according to claim 18 , wherein the second inducing circuit comprises:
a second current source, for outputting a second source current;
a first switch, coupled to the second current source and the third terminal; and
a second switch, coupled to the second current source and the fourth terminal,
wherein the first switch and the second switch receive the second source current and outputs the second sub-current to contribute the second current.

20. The inductor-based apparatus according to claim 19 , wherein the second inducing circuit further comprises:
a first compensation module, coupled to the second terminal; and
a second compensation module, coupled to the first terminal, wherein the first compensation module and the second compensation module adjust the second sub-current to contribute the second current.

21. A compensation apparatus, comprising:
a primary circuit, for providing a first voltage difference and a first current, comprising:
a function circuit, for generating an input signal; and
a first inductor, coupled to the function circuit, wherein the first current flows through the first inductor; and
a compensation circuit, comprising:
a second inductor, wherein a second current flowing through the second inductor is related to the first voltage difference; and
a current source circuit, for outputting the second

Assignees

• Mediatek Inc

Inventors

• Su Richard Y
• Hsueh Yu-Li
• Shen Chih-Hsien
• Hung Chao-Ching
• Tsai Yi-Chien

Classifications

• H03L7/099 Primary

  concerning mainly the controlled oscillator of the loop · CPC title

• H03L1/022

  by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature (H03L1/021 takes precedence) · CPC title