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US 11,309,836 B1Granted
Differential crystal oscillator with large voltage swing
AssigneeRealtek Semiconductor Corp.
InventorChia-Liang (Leon) Lin
Life of this patent
Estimating the term…
Abstract
A differential crystal oscillator includes a source follower configured to receive an oscillatory signal and output a regenerated signal; a resonant network having a crystal and configured to terminate the oscillatory signal and determine an oscillation frequency of the oscillatory signal; a regenerative network configured to regenerate the regenerated signal; and a capacitive feedback network configured to provide a feedback from the regenerated signal to the oscillatory signal.
Claims16
A differential crystal oscillator comprising:
- a first source follower comprising a first MOS (metal-oxide semiconductor) transistor and a second MOS transistor of a first type configured to receive an oscillatory signal comprising a first voltage and a second voltage at a first node and a second node, respectively, and output a regenerated signal comprising a third voltage and a fourth voltage at a third node and a fourth node, respectively;
- a regenerative network comprising a third MOS transistor and a fourth MOS transistor of the first type configured in a cross-coupling topology between the third node and the fourth node to regenerate the regenerated signal;
- a capacitive feedback network comprises a first capacitor and a second capacitor configured to couple the first node and the second node to the third node and the fourth node, respectively and a third capacitor and a fourth capacitor configured to shunt the third node and the fourth node, respectively, to ground;
- a first DC (direct current) coupling resistor and a second DC coupling resistor configured to couple a first bias voltage to the first node and the second node, respectively;
- and
- a resonant network comprising a crystal placed between the first node and the second node.
3 more elements
A differential crystal oscillator comprising:
- a first source follower configured to receive an oscillatory signal and output a regenerated signal;
- a resonant network comprising a crystal and configured to terminate the oscillatory signal and determine an oscillation frequency of the oscillatory signal;
- a regenerative network configured to regenerate the regenerated signal;
- a capacitive feedback network configured to provide a feedback from the regenerated signal to the oscillatory signal;
- and
- an AC (alternate current) coupling network configured to couple the oscillatory signal to an auxiliary oscillatory signal, and a second source follower configured to receive the auxiliary oscillatory signal and along with the first source follower jointly output the regenerated signal.
3 more elements
A differential crystal oscillator comprising:
- a first source follower configured to receive an oscillatory signal and output a regenerated signal;
- a resonant network comprising a crystal and configured to terminate the oscillatory signal and determine an oscillation frequency of the oscillatory signal;
- a regenerative network configured to regenerate the regenerated signal;
- a capacitive feedback network configured to provide a feedback from the regenerated signal to the oscillatory signal;
- and
- an AC (alternate current) coupling network configured to couple the oscillatory signal to an auxiliary oscillatory signal, and a second source follower configured to receive the auxiliary oscillatory signal and along with the first source follower jointly output the regenerated signal,
- wherein the first source follower comprises a first MOS (metal oxide semiconductor) transistor and a second MOS transistor of a first type configured to receive a first end and a second end of the oscillatory signal at a first node and a second node, respectively, and output a first end and a second end of the regenerated signal at a third node and a fourth node, respectively;
- wherein the regenerative network comprises a third MOS transistor and a fourth MOS transistor of the first type configured in a cross-coupling topology to regenerate the regenerated signal;
- wherein the capacitive feedback comprises a first capacitor and a second capacitor configured to couple the first node and the second node to the third node and the fourth node, respectively, and a third capacitor and a fourth capacitor configured to shunt the third node and the fourth node, respectively, to ground.
6 more elements
Dependencies are inferred from the claim text.