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US 6,714,086 B1Granted
Symmetric oscillators
AssigneeITT Manufacturing Enterprises, Inc.
InventorsJames Edward Landrith, William J. Tanis
Life of this patent
Estimating the term…
Abstract
A symmetrical oscillator includes a reactive element, such as an inductor, coupled between first and second active components, where the reactive element defines a fundamental resonant frequency with one or more capacitances of the oscillator. A first feedback circuit is coupled between the first active component and a common node, while a second feedback circuit is coupled between the second active component and the common node such that an output signal at substantially twice the fundamental resonant frequency is obtained at the common node.
Claims76
A symmetrical oscillator, comprising:
- a first active component having a drive terminal and first and second gain terminals, one of the first and second gain terminals of the first active component being coupled to a first reference node;
- a second active component having a drive terminal and first and second gain terminals, one of the first and second gain terminals of the second active component being coupled to the first reference node;
- a reactive element coupled between the drive terminals of the first and second active components, the reactive element including a first inductor coupled between first and second terminals, and being coupled to the first and second active components by way of first and second capacitors formed from at least one of varactor diodes and microelectromechanical systems, each having one end connected to a respective one of the first and second terminals and another end coupled to a respective one of the drive terminals of the first and second active components, the reactive element at least partially defining a fundamental resonant frequency;
- a first feedback circuit having at least one reactive component coupled between the other of the first and second gain terminals of the first active component and a common node;
- and
- a second feedback circuit having at least one reactive component coupled between the other of the first and second gain terminals of the second active component and the common node,
- wherein an output signal is taken from at least one of the reactive element, the common node, and the first reference node.
4 more elements
A symmetrical oscillator, comprising:
- a first active component having a drive terminal and first and second gain terminals, one of the first and second gain terminals of the first active component being coupled to a first reference node;
- a second active component having a drive terminal and first and second gain terminals, one of the first and second gain terminals of the second active component being coupled to the first reference node;
- a first reactive element coupled between the other of the first and second gain terminals of the first active component and the drive terminal of the first active component;
- a second reactive element coupled between the other of the first and second gain terminals of the second active component and the drive terminal of the second active component, the first and second reactive elements at least partially defining a fundamental resonant frequency;
- a first shunt circuit having at least one reactive component coupled between the drive terminal of the first active component and a common node;
- a second shunt circuit having at least one reactive component coupled between the drive terminal of the second active component and the common node;
- and
- a feedback circuit coupled between the others of the first and second gain terminals of the first and second active components,
- wherein an output signal is taken from at least one of the feedback circuit, the common node, and the first reference node.
6 more elements
A symmetrical oscillator, comprising:
- a first active component having a drive terminal and first and second gain terminals, the drive terminal of the first active component being coupled to a first reference node;
- a second active component having a drive terminal and first and second gain terminals, the drive terminal of the second active component being coupled to the first reference node;
- a reactive element coupled between one of the first and second gain terminals of the first active component and one of the first and second gain terminals of the second active component, the reactive element at least partially defining a fundamental resonant frequency;
- a first shunt circuit having at least one reactive component coupled between the other of the first and second gain terminals of the first active component and a common node;
- and
- a second shunt circuit having at least one reactive component coupled between the other of the first and second gain terminals of the second active component and the common node,
- wherein an output signal is taken from at least one of the reactive element, the common node, and the first reference node.
4 more elements
Dependencies are inferred from the claim text.