Oscillator module and communications device using the same

• US 6,232,846 B1
• Filed: 06/10/1999
• Issued: 05/15/2001
• Est. Priority Date: 06/12/1998
• Status: Expired due to Fees

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Hirano, Yasuhiko, Ieki, Tsutomu, Tanaka, Hiroaki
• Primary Examiner(s): Mis, David
• Application Number:
  US09/329,825
• Time in Patent Office: 705 Days
• Field of Search: 331/44, 331/68, 331/96, 331/107.A, 331/154, 331/175
• US Class Current: 331/107.00A
• CPC Class Codes: G01R 31/2824 testing of oscillators or resonators
• CPC Class Codes: G07C 2009/00793 by Hertzian waves
• CPC Class Codes: G07C 9/00182 operated with unidirectional data transmission between data carrier and locks
• CPC Class Codes: H03B 5/326 the resonator being an acoustic wave device, e.g. SAW or BAW device
• CPC Class Codes: H03B 5/362 the amplifier being a single transistor H03B5/364 - H03B5/368 take precedence
• CPC Class Codes: H03B 5/364 the amplifier comprising field effect transistors H03B5/366 takes precedence

Abstract

An oscillator module in which external wires can be reduced, and characteristics of a resonator and oscillation margin can be measured. A circuit portion for oscillation and a two-port surface acoustic wave resonator are sealed in a package, one of the terminals of the two-port surface acoustic wave resonator is connected inside the package to an input terminal of the circuit portion for oscillation. The number of external terminals provided at the package is reduced, enabling the oscillator module to be made small-scale and at lower cost. Furthermore, it is possible to measure the insertion loss and resonant frequency of the two-port surface acoustic wave resonator, and the oscillation margin of the oscillator module, making it possible to improve the yield of the oscillator and reduce costs.

Claims

1. An oscillator module, comprising:

an oscillator circuit;

a surface acoustic wave resonator having four terminals; and

a package enclosing said oscillator circuit and said surface acoustic wave resonator, said package having two external oscillator terminals connected to said oscillator circuit, and two external resonator terminals connected respectively to two terminals of said surface acoustic wave resonator,

wherein the remaining two terminals of said surface acoustic wave resonator are connected to said oscillator circuit inside said package.

2. The oscillator module according to claim 1, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

3. The oscillator module according to claim 2, wherein said oscillator circuit includes a bare integrated circuit chip mounted within said package and said surface acoustic wave resonator includes a bare integrated circuit chip mounted within said package.

4. The oscillator module according to claim 1, wherein said oscillator circuit includes a bare integrated circuit chip mounted within said package and said surface acoustic wave resonator includes a bare integrated circuit chip mounted within said package.

5. The oscillator module according to claim 1, wherein said two external resonator terminals are connected respectively to an input terminal and an output terminal of said SAW resonator.

6. The oscillator module according to claim 5, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

7. The oscillator module according to claim 5, wherein an input terminal and an output terminal of said SAW resonator are connected to said oscillator circuit.

8. The oscillator module according to claim 7, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

9. The oscillator module according to claim 1, wherein an input terminal and an output terminal of said SAW resonator are connected to said oscillator circuit.

10. The oscillator module according to claim 9, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

11. A communications device, comprising at least one of a transmitting circuit and a receiving circuit, said circuit comprising an oscillator module, said oscillator module including:

an oscillator circuit;

a surface acoustic wave resonator having four terminals; and

a package enclosing said oscillator circuit and said surface acoustic wave resonator, said package having two external oscillator terminals connected to said oscillator circuit, and two external resonator terminals connected respectively to two terminals of said surface acoustic wave resonator,

wherein the remaining two terminals of said surface acoustic wave resonator are connected to said oscillator circuit inside said package.

12. The communications device according to claim 11, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

13. The communications device according to claim 12, wherein said oscillator circuit includes a bare integrated circuit chip mounted within said package and said surface acoustic wave resonator includes a bare integrated circuit chip mounted within said package.

14. The communications device according to claim 11, wherein said oscillator circuit includes a bare integrated circuit chip mounted within said package and said surface acoustic wave resonator includes a bare integrated circuit chip mounted within said package.

15. The communications device according to claim 11, wherein said two external resonator terminals are connected respectively to an input terminal and an output terminal of said SAW resonator.

16. The communications device according to claim 15, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

17. The communications device according to claim 15, wherein an input terminal and an output terminal of said SAW resonator are connected to said oscillator circuit.

18. The communications device according to claim 17, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.

19. The communications device according to claim 11, wherein an input terminal and an output terminal of said SAW resonator are connected to said oscillator circuit.

20. The communications device according to claim 19, wherein an output terminal of said surface acoustic wave resonator is connected to an input terminal of said oscillator circuit inside said package.