Injection-locked frequency divider and frequency dividing method thereof
An injection-locked frequency divider includes a selecting module for generating a control signal; a biasing module coupled to the selecting module, for receiving an original signal and generating a biasing signal according to the control signal; and an oscillating module coupled to the biasing module, for receiving the biasing signal to generate a target signal. A ratio exists between the frequency of the target signal and the frequency of the original signal.
1. An injection-locked frequency divider comprising:
a selecting module used for generating a control signal;
a biasing module electrically coupled to the selecting module for receiving an original signal and generating a bias signal according to the control signal; and
an oscillating module electrically coupled to the biasing module for receiving the bias signal to generate a target signal; wherein the frequency of the target signal and the frequency of the original signal are related by a ratio.
2. The injection-locked frequency divider of claim 1 , wherein the biasing module provides a biasing current of the bias signal to the oscillating module according to the control signal.
3. The injection-locked frequency divider of claim 1 , wherein the selecting module changes the control signal for adjusting the bias signal, so as to modulate the operating frequency band of the injection-locked frequency divider.
4. The injection-locked frequency divider of claim 1 , wherein the biasing module further comprises a plurality of sub-biasing modules.
5. The injection-locked frequency divider of claim 4 , wherein each sub-biasing module comprises:
a current source used for providing a current signal; and
a switch being electrically coupled to the current source for executing an on/off operation according to the control signal.
6. The injection-locked frequency divider of claim 1 , wherein the oscillating module is a ring oscillator.
7. The injection-locked frequency divider of claim 1 , wherein the oscillating module is a differential mode ring oscillator.
8. The injection-locked frequency divider of claim 1 , wherein the oscillating module is an LC tank oscillator.
9. A frequency dividing method comprising;
inputting an original signal;
inputting a control signal;
utilizing a biasing module to generate a bias signal according to the original signal and the control signal; and
utilizing an oscillating module to generate a target signal according to the biasing signal;
wherein the frequency of the target signal and the frequency of the original signal are related by a ratio;
wherein the step of generating the bias signal further comprises:
controlling enabling states of a plurality of sub-biasing modules according to the control signal.
10. The frequency dividing method of claim 9 , wherein the step of generating the bias signal comprises:
controlling the biasing current of the bias signal according to the control signal.
11. The frequency dividing method of claim 9 , further comprising:
changing the control signal to adjust the frequency of the target signal.
12. The frequency dividing method of claim 9 , wherein the oscillating module is a ring oscillator.
13. The frequency dividing method of claim 9 , wherein the oscillating module is a differential mode ring oscillator.
14. The frequency dividing method of claim 9 , wherein the oscillating module an LC tank oscillator.