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US 8,410,830 B2Granted
Injection locked frequency divider and associated methods
AssigneeSilicon Laboratories Inc.
InventorShahram Mahdavi
Life of this patent
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Abstract
An apparatus includes an injection locking frequency divider, which includes a first resonant tank that has a first resonance frequency and a common mode path that includes a second resonant tank, and has a second resonance frequency that is a harmonic of the first resonance frequency. The second resonant tank is adapted to receive a first signal having an oscillation frequency near the harmonic of the first resonance frequency to cause the first resonant tank to provide a second signal that is locked to the first signal.
Claims18
An apparatus comprising:
- an injection locking frequency divider comprising a first resonant tank having a first resonance frequency and a second resonant tank having a second resonance frequency that is a harmonic of the first resonance frequency,
- wherein the second resonant tank is adapted to receive a first signal at a node of the second resonant tank, the first signal having an oscillation frequency near the harmonic, to cause the first resonant tank to provide a second signal that is locked to the first signal,
- wherein the injection locking frequency divider comprises cross coupled transistors coupled to the first resonant tank,
- wherein the cross coupled transistors comprise source terminals that are coupled together to form a differential pair of transistors, and
- wherein the second resonant tank is coupled to the source terminals.
2 more elements
A method comprising:
- generating an oscillation in a primary resonant tank of an oscillator to produce an output signal, the oscillation producing at least one harmonic in a secondary resonant tank of the oscillator;
- injecting an input signal in a node of the secondary resonant tank to synchronize the output signal to the input signal;
- and
- using a cross coupled differential pair of transistors between the primary and secondary resonant tanks.
1 more element
An apparatus comprising:
- an injection locking frequency divider comprising a first resonant tank having a first resonance frequency and a second resonant tank having a second resonance frequency that is an even harmonic of the first resonance frequency,
- wherein the second resonant tank is adapted to receive a first signal at a node of the second resonant tank, the first signal having an oscillation frequency near the harmonic, to cause the first resonant tank to provide a second signal that is locked to the first signal.
Dependencies are inferred from the claim text.