Single pin crystal oscillator circuit
AssigneeSierra Semiconductor Corporation
InventorsJyn-Bang Shyu, Jin Zhao
Life of this patent
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Abstract
A single pin integrated oscillator circuit includes an amplifier having a first input terminal to which an external crystal may be connected, and a second input terminal which receives a feedback path from an output terminal of the amplifier. An oscillator output signal having a relatively large voltage swing is provided from the first input terminal through a buffer. The oscillator operates over a wide range of voltages and process variations, and it can accept an input signal from an external crystal or can accept any clock signal having a swing of approximately 1 V.
Claims10
An oscillator circuit formed within an integrated circuit having
- a package and connectors extending outside said package, said oscillator circuit comprising:
- an input lead coupled to a single one of said connectors designated to be connected to a crystal;
- a plurality of differential amplifiers which are fully differential, each having multiple input terminals and multiple output terminals, said input lead being coupled to one of said input terminals of each of said differential amplifiers of said plurality;
- a feedback path coupled from at least one output terminal to another one of said input terminals;
- and
- a buffer coupled to said one of said input terminals, said buffer producing an oscillator output signal.
Dependencies are inferred from the claim text.