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US 2007/0182503 A1Published application
Oscillator having low phase noise
AssigneeLinear Technology Corporation
InventorJoseph Petrofsky
Life of this patent
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Abstract
An oscillator for minimizing phase noise is configured with a transistor coupled to a first reference voltage source, a differential transistor pair comprising first and second voltage followers coupled between a second reference voltage source and the transistor, and a reactive network coupled between control electrodes of the first and second voltage followers. A resistance network is coupled between the control electrodes and in parallel with the reactive network. Various embodiments, including Colpitts and Clapp, are presented.
Claims73
An oscillator comprising:
- a transistor coupled to a first reference voltage source;
- a differential transistor pair comprising first and second voltage followers coupled between a second reference voltage source and the transistor;
- a reactive network coupled between control electrodes of the first and second voltage followers;
- and
- a resistance network coupled between the control electrodes and in parallel with the reactive network.
2 more elements
An oscillator comprising:
- a transistor coupled to a first reference voltage source;
- a differential transistor pair comprising first and second voltage followers coupled between a second reference voltage source and the transistor;
- a capacitance network coupled between control electrodes of the first and second voltage followers;
- and
- an inductor coupled between the control electrodes of the first and second voltage followers, and having a center tap coupled to a third reference voltage source.
2 more elements
An oscillator comprising:
- a differential transistor pair including first and second transistors each having a control electrode, a first electrode and a second electrode, the first electrode of each transistor being coupled to a first reference voltage source, the second electrodes of the first and second transistors being coupled to each other through a first resistance network, and the first resistance network being coupled to a second reference voltage source;
- a second resistance network coupled between the control electrodes of the first and second transistors;
- a reactance network coupled between the control electrodes of the first and second transistors;
- and
- a capacitance network coupled between the control electrodes of the first and second transistors.
2 more elements
An oscillator comprising:
- a differential transistor pair including first and second transistors each having a control electrode, a first electrode and a second electrode, the first electrodes of each transistor being coupled to a first reference voltage source, the second electrodes of the first and second transistors being coupled to each other through a resistance network, and the resistance network being coupled to a second reference voltage source;
- an inductor coupled between the control electrodes of the first and second transistors, and having a center tap coupled to a third reference voltage source;
- and
- a capacitance network coupled between the control electrodes of the first and second transistors.
1 more element
An oscillator comprising:
- a differential transistor pair comprising first and second voltage followers each having first and second electrodes respectively coupled to first and second reference voltage sources;
- a reactive network coupled between control electrodes of the first and second voltage followers;
- a resistance network coupled between the control electrodes and in parallel with the reactive network;
- and
- an amplitude control loop for controlling a bias level of the first and second voltage followers.
2 more elements
An oscillator comprising:
- a differential transistor pair comprising first and second voltage followers each having first and second electrodes respectively coupled to first and second reference voltage sources;
- a capacitance network coupled between control electrodes of the first and second voltage followers;
- an inductor coupled between the control electrodes of the first and second voltage followers, and having a center tap;
- and
- an amplitude control loop for controlling a bias level of the first and second voltage followers.
2 more elements
Dependencies are inferred from the claim text.