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US 9,054,711 B2Granted
Frequency divider
AssigneeInfineon Technologies AG
InventorsLeonardo Lorenzon, Andrea Bevilacqua, Nicola DaDalt
Life of this patent
Estimating the term…
Abstract
This disclosure relates to a divide-by-N frequency divider system and frequency dividing method. The system includes a ring oscillator having M stages, where M is an integer, and a zero mean current component coupled to one or more of the stages to provide a zero mean current flow path.
Claims10
A divide-by-N frequency divider system, where N is an integer, comprising:
- a ring oscillator having M stages, where M is an integer, the ring oscillator configured to receive an injection input signal and provide an output signal, and each of the M stages have a single input and a single output configured, respectively, to receive an output from its preceding stage in the ring and to provide an input to its succeeding stage in the ring;
- and
- a zero mean current component coupled to one or more of the stages to provide a zero mean current flow path,
- wherein each M stage comprises a Complementary Metal Oxide Semiconductor (CMOS) inverter and at least one transistor coupled between the CMOS inverter and the zero mean current component, the at least one transistor comprising a gate, source, and drain, the gate configured to receive an injection voltage, the source coupled to the zero mean current component, and the drain coupled to a node of the ring oscillator.
1 more element
A divide-by-N frequency divider system, where N is an integer, comprising:
- a ring oscillator having M stages, where M is an integer, the ring oscillator configured to receive an injection input signal and provide an output signal;
- and
- a zero mean current component coupled to one or more of the stages to provide a zero mean current flow path;
- wherein the ring oscillator is a differential ring oscillator, and each of the M stages comprises:
- a stage component having a first output terminal and a second output terminal:
- a first injection device coupled between the first output terminal of the stage component and the zero mean current component;
- and
- a second injection device coupled between the second output terminal of the stage component and the zero mean current component.
5 more elements
A frequency divider system comprising:
- a plurality of stages, each stage including a stage component and an injection device coupled to the stage component;
- and
- a zero mean current component coupled to the injection device to provide a zero mean current flow path;
- wherein the stage component is a differential delay stage having a first output terminal and a second output terminal, and wherein the injection device is a first injection device coupled between the first output terminal of the stage component and the zero mean current component, the stage component further comprising a second injection device coupled between the second output terminal of the stage component and the zero mean current component.
1 more element
Dependencies are inferred from the claim text.