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Patent Searching and Data


Title:
SIGNAL GENERATOR CIRCUIT, OSCILLATOR, AND RADAR APPARATUS
Document Type and Number:
Japanese Patent JP2013047617
Kind Code:
A
Abstract:

To provide a signal generator circuit and a radar apparatus capable of providing a low-noise and highly linear FMCW signal of highly accurate frequency.

A signal generator circuit of one embodiment includes an oscillator whose frequency is controlled by an analog control signal. The circuit also includes a digital phase detector, a first differentiator, and a comparator which outputs digital frequency error information. Further, the circuit includes: a second differentiator that differentiates a frequency setting code to produce a gain value, which corresponds to the slope of the frequency setting code, and the inverse thereof; a first multiplier for multiplying the digital frequency error information and the gain value; a low pass filter for removing high frequency components from the multiplication result; a second multiplier for multiplying the low pass filter output and the inverse of the gain value; a D/A converter for converting the multiplication result into analog frequency error information; and an integrator for integrating the analog frequency error information to convert the same into analog phase error information and outputting the same as an analog control signal.


Inventors:
KOBAYASHI YUKA
SAKURAI HIROKI
Application Number:
JP2011185519A
Publication Date:
March 07, 2013
Filing Date:
August 29, 2011
Export Citation:
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Assignee:
TOSHIBA CORP
International Classes:
G01S13/34
Domestic Patent References:
JP2013002949A2013-01-07
JPH10163756A1998-06-19
JPH08211111A1996-08-20
JPH03106226A1991-05-02
JP2010237172A2010-10-21
JP2011196880A2011-10-06
JP2009028010A2009-02-12
JP2008224350A2008-09-25
JP2002062355A2002-02-28
JP2008072257A2008-03-27
Foreign References:
US6114987A2000-09-05
US3938050A1976-02-10
US20100213993A12010-08-26
US4593287A1986-06-03
Attorney, Agent or Firm:
Patent Business Corporation Sakura International Patent Office