Patent ID: 7656205

Claim:
A dual-injection locked frequency dividing circuit having an input/output interface including a signal input port and a pair of differential output ports including a positive differential output port and a negative differential output port, for providing a frequency dividing function to an input signal at the signal input port; the dual-injection locked frequency dividing circuit comprising: a dual-injection interface module, which is used to bifurcate the input signal into at least two signals respectively serving as a first injection signal and a second injection signal; wherein the first injection signal is injected in a switched manner to both a first node and a second node where the first node is connected to the positive differential output port and the second node is connected to the negative differential output port, while the second injection signal is injected to a third node; a first cross-switching circuit module, for providing a cross-switching function to the first injection signal injected by the dual-injection interface module across the first node and the second node; a second cross-switching circuit module, for providing an inversed cross-switching function to the first injection signal injected by the dual-injection interface module across the first node and the second node; a first resonant circuit module, which is connected between the first node and the second node for providing a resonant effect to the first injection signal injected by the dual-injection interface module; and a second resonant circuit module, which is connected between the third node and a grounding point for providing a resonant effect to the second injection signal injected by the dual-injection interface module.