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Title:
OSCILLATION FREQUENCY ADJUSTMENT CIRCUIT
Document Type and Number:
Japanese Patent JP2014017804
Kind Code:
A
Abstract:

To shorten a testing time required to correct an oscillation frequency of an oscillator.

A heater section 2 and oscillators 3a, 3b are provided in a semiconductor chip 1. A counter 4 counts an oscillation signal Svar of the oscillator 3a. A correction value output section 5 outputs a correction value Fh for correcting a temperature characteristic of the oscillator 3b on the basis of a count value of the counter 4. An ADPLL 7 generates an oscillation signal Sout on the basis of an oscillation signal Sref of the oscillator 3b, and corrects an oscillation frequency Fout of the oscillation signal Sout on the basis of the count value of the counter 4.


Inventors:
KOZAI SHOHEI
SATO YUJI
KOBAYASHI HIROYUKI
Application Number:
JP2013001235A
Publication Date:
January 30, 2014
Filing Date:
January 08, 2013
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
H03K3/03; H03L1/02; H03L7/08
Domestic Patent References:
JP2000509219A2000-07-18
JPH0658623U1994-08-12
JP2013051676A2013-03-14
JP2007060649A2007-03-08
JP2004201280A2004-07-15
JP2002076886A2002-03-15
JP2009021954A2009-01-29
JP2000509219A2000-07-18
JPH0658623U1994-08-12
Foreign References:
US7619486B12009-11-17
US7619486B12009-11-17
Attorney, Agent or Firm:
Hiroaki Sakai



 
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