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US 2012/0068745 A1Published application
Injection-locked frequency divider
AssigneeTaiwan Semiconductor Manufacturing Company, Ltd.
InventorsHsieh-Hung HSIEH, Chewn-Pu JOU, Fu-Lung HSUEH
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Abstract
A representative injection-locked frequency divider includes a differential direct injection pair that is configured to receive and mix differential injection signals and an oscillator that is electrically connected to the differential direct injection pair and produces an operating frequency based on the mixed differential injection signals.
Claims20
An injection-locked frequency divider comprising:
- a differential direct injection pair that is configured to receive and mix differential injection signals;
- and
- an oscillator that is electrically connected to the differential direct injection pair and produces an operating frequency based on the mixed differential injection signals.
A phase-locked loop comprising:
- a phase frequency detector having an input and an output, the input of the phase frequency detector being configured to receive a reference input signal and a feedback signal and detect a phase difference between the reference input signal and the feedback signal, the phase frequency detector being configured to produce an error signal based on the phase difference at the output of the phase frequency detector;
- a signal generator having an input and an output, the input of the signal generator being configured to receive the error signal from the phase frequency detector, the signal generator being configured to produce an output frequency based on the error signal at its output;
- an injection-locked frequency divider (ILFD) that is electrically coupled to the output of the signal generator and receives comprising:
- a differential direct injection pair that is configured to receive the output frequency from the signal generator;
- and
- an oscillator that is electrically connected to the differential direct injection pair and produces an oscillation frequency, wherein the differential direct injection pair mixes the output frequency and the oscillation frequency to produce an ILFD output frequency;
- and
- a frequency divider that receives the ILFD output frequency and produces the feedback signal to the input of the phase frequency detector.
5 more elements
An integrated circuit comprising:
- a phase frequency detector having an input and an output, the input of the phase frequency detector being configured to receive a reference input signal and a feedback signal and detect a phase difference between the reference input signal and the feedback signal, the phase frequency detector being configured to produce an error signal based on the phase difference at the output of the phase frequency detector;
- a signal generator having an input and an output, the input of the signal generator being configured to receive the error signal from the phase frequency detector, the signal generator being configured to produce an output frequency based on the error signal at its output;
- an injection-locked frequency divider (ILFD) that is electrically coupled to the output of the signal generator and receives comprising:
- a differential direct injection pair that is configured to receive the output frequency from the signal generator, wherein the differential direct injection pair operates as switches to turned on and off the injection-locked frequency divider, and
- an oscillator that is electrically connected to the differential direct injection pair in a direct-injection scheme and produces an oscillation frequency, wherein the differential direct injection pair mixes the output frequency and the oscillation frequency to produce an ILFD output frequency;
- and
- a frequency divider that receives the ILFD output frequency and produces the feedback signal to the input of the phase frequency detector.
4 more elements
Dependencies are inferred from the claim text.