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US 12,683,553 B2Granted
Reducing startup time in a crystal oscillator
AssigneeTexas Instruments Incorporated
InventorAnimesh Paul
Life of this patent
Estimating the term…
Abstract
An oscillator apparatus, including a first node adapted to be coupled to a first terminal of a crystal oscillator; a second node adapted to be coupled to a second terminal of the crystal oscillator; a transconductance circuit; a first switch coupled between the first node and the second node; and a second switch coupled between the transconductance circuit and the second node.
Claims23
An electronic circuit comprising:
- first and second input terminals;
- an intermediate node coupled between the first and second input terminals;
- and
- a controller configured to:
- at a first time, couple the first and second input terminals to cause a first voltage at the first input terminal to propagate to the second input terminal, and
- at a second time after the first time, couple the intermediate node to the second input terminal to cause a voltage drop at the second input terminal while maintaining the first voltage at the first input terminal, wherein the intermediate node has a second voltage at the second time, and wherein a difference between the first voltage and the second voltage is less than a rail-to-rail voltage.
3 more elements
An electronic circuit comprising:
- a first switch having a first terminal and a second terminal;
- a transistor having a control terminal, a first current path terminal coupled to the first terminal of the first switch, and second current path terminal;
- a second switch having a first terminal and a second terminal, the first terminal coupled to the second terminal of the first switch and the second terminal coupled to the control terminal of the transistor;
- a first resistor coupled between the control terminal of the transistor and the first current path terminal of the transistor;
- and
- a second resistor coupled between the control terminal of the transistor and the second current path terminal of the transistor.
3 more elements
A system comprising:
- an oscillator having a first terminal and a second terminal;
- a first switch having a first terminal and a second terminal, the first terminal coupled to the first terminal of the oscillator and the second terminal coupled to the second terminal of the oscillator;
- a transistor having a control terminal, a first current path terminal coupled to the first terminal of the first switch, and second current path terminal;
- a second switch having a first terminal and a second terminal, the first terminal coupled to the second terminal of the first switch and the second terminal coupled to the control terminal of the transistor;
- a first resistor coupled between the control terminal of the transistor and the first current path terminal of the transistor;
- and
- a second resistor coupled between the control terminal of the transistor and the second current path terminal of the transistor.
4 more elements
Dependencies are inferred from the claim text.