Crystal oscillator
AssigneeNihon Dempa Kogyo Co., Ltd.
InventorFumio Asamura
Life of this patent
Estimating the term…
Abstract
A crystal oscillator is configured by accommodating a crystal blank that functions as a crystal unit and an IC chip that includes at least an oscillator circuit using the crystal blank into a container in an integrated manner. In the IC chip, the oscillator circuit is connected to the crystal unit via a pair of crystal connecting terminals, an output from the oscillator circuit is supplied to a plurality of output buffers. In relation to the crystal connecting terminal having a phase opposite to that of an output from the on/off controllable output buffer, an output terminal of this output buffer is disposed farther than an output terminal of the output buffer that is not subjected to the on/off control.
Claims5
A crystal oscillator, comprising:
- a crystal unit;
- and an IC chip that integrates at least an oscillator circuit using said crystal unit, said crystal unit and said oscillator circuit being housed in a container,
- wherein said IC chip includes:
- a plurality of output buffers that amplify an output from said oscillator circuit and output the amplified output to outside;
- a pair of crystal connecting terminals that are used for electrical connection between said oscillator circuit and said crystal unit;
- and output terminals provided for said respective output buffers,
- signals of an oscillation frequency component appear at said pair of crystal connecting terminals with phases opposite to each other,
- each of said plurality of output buffers independently includes an inverting or non-inverting amplifier,
- at least one of said plurality of output buffers is an output buffer whose output is on/off controllable according to an enable signal, and
- said container is configured such that, for each on/off controllable output buffer, wiring is made such that a capacitance between said crystal connecting terminal having a phase opposite to that of the output of said each on/off controllable output buffer and an output terminal of said each on/off controllable output buffer is smaller than a capacitance between the output terminal of said each on/off controllable output buffer and the other crystal connecting terminal.
Dependencies are inferred from the claim text.