Title:
FILTER DEVICE AND CONTROL METHOD THEREFOR
Document Type and Number:
WIPO Patent Application WO/2011/122024
Kind Code:
A1
Abstract:
Provided is a filter device having a function for adjusting the center frequency of a filter. The filter device comprises: a filter core (102) equipped with an adder (109) which outputs an addition signal obtained by adding an input signal and a feedback signal (signal Vf), an AGC circuit (110) that generates an amplified signal obtained by amplifying the addition signal, and a phase shifter (111) that shifts the phase of the amplified signal to generate a signal (signal Vf); an amplitude comparison circuit (101) that compares the amplitude of a reference amplitude with the amplitude of the signal Vf; a gain control voltage generator (108) that controls the amplification rate of the AGC circuit (110) on the basis of the comparison results; a frequency comparison circuit (103) that compares the frequency of the signal Vf with a reference frequency; and a phase shifter control voltage generator (117) that controls the amount of phase shift of the phase shifter (111) on the basis of the comparison results. While the amplification rate, and amount of shift are being controlled, the gain control voltage generator (108) oscillates the filter core (102).
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Inventors:
KAMADA MIKIO (JP)
Application Number:
PCT/JP2011/001913
Publication Date:
October 06, 2011
Filing Date:
March 30, 2011
Export Citation:
Assignee:
ASAHI KASEI MICRODEVICES CORP (JP)
KAMADA MIKIO (JP)
KAMADA MIKIO (JP)
International Classes:
H03H11/12; H03H11/04
Foreign References:
| JP2001512650A | 2001-08-21 | |||
| JPS461610A | ||||
| JP2009117913A | 2009-05-28 | |||
| JP2001274654A | 2001-10-05 | |||
| JPS5017747A | 1975-02-25 | |||
| JPH01317014A | 1989-12-21 | |||
| US20080003246A1 | 2008-01-03 |
Other References:
See also references of EP 2485397A4
THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, vol. 108, no. 212, 2008, pages 57 - 61
THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS, vol. 108, no. 212, 2008, pages 57 - 61
Attorney, Agent or Firm:
MORI, Tetsuya et al. (JP)
Woods Tetsuya (JP)
Woods Tetsuya (JP)
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Claims: