Title:
METHOD OF DESIGNING PASSIVE RC COMPLEX FILTER OF HARTLEY RADIO RECEIVER
Document Type and Number:
WIPO Patent Application WO/2006/054364
Kind Code:
A1
Abstract:
A technique of designing a complex transfer function realized by a passive RC complex filter while completely taking the feature of the proto-type lowpass characteristic. As a first step, a proto-type lowpass characteristic F(p) having a pole on a unit circle. As a second step, the proto-type lowpass characteristic F(p) is subjected to bilinear variable transform represented by p=j(s-j)/(s+j) to derive a complex coefficient transfer function G(s). As a third step, from the G(s), a passive RC complex filter H(s) is designed.
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Inventors:
HORI KAZUYUKI (JP)
Application Number:
PCT/JP2004/017644
Publication Date:
May 26, 2006
Filing Date:
November 19, 2004
Export Citation:
Assignee:
HITACHI COMM TECH LTD (JP)
HORI KAZUYUKI (JP)
HORI KAZUYUKI (JP)
International Classes:
H03H7/06; H03D7/18; H03H7/21
Foreign References:
| JP2004108792A | 2004-04-08 | |||
| JPH0865083A | 1996-03-08 | |||
| JP2001045080A | 2001-02-16 | |||
| JP2001077648A | 2001-03-23 |
Other References:
YUKIO KAGAWA: "Analogue/Digital.Filter", vol. FIRST ED, 25 December 1981, KAGAKU GIJUTSU SHUPPANSHA, pages: 62 - 70, XP002999555
NIKI Y. ET AL.: "CAS2002-113 'RC Polyphase.Filter no Kaiseki to Sekkei-Nyuryoku Impedance, Shutsuryoku Shutan, Soshi Baratsuki no Eikyo no Kaiseki, Tsukaiki Heitan Ritoku Filter Sekkei-", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS GIJUTSU KENKYU HOKOKU, vol. 102, no. 572, 15 January 2003 (2003-01-15), pages 35 - 40, XP002999556
FUKURA J. ET AL.: "ECT-02-71, 'Tatanshi Tsui F Gyoretsu ni yoru RC Polyphase Filter no Kaiseki", THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN KENKYUKAI SHIRYO, DENSHI KAIRO KENKYUKAI, ECT-02-66 TO 83, 5 July 2002 (2002-07-05), pages 23 - 26, XP002999557
NIKI Y. ET AL.: "CAS2002-113 'RC Polyphase.Filter no Kaiseki to Sekkei-Nyuryoku Impedance, Shutsuryoku Shutan, Soshi Baratsuki no Eikyo no Kaiseki, Tsukaiki Heitan Ritoku Filter Sekkei-", THE INSTITUTE OF ELECTRONICS, INFORMATION AND COMMUNICATION ENGINEERS GIJUTSU KENKYU HOKOKU, vol. 102, no. 572, 15 January 2003 (2003-01-15), pages 35 - 40, XP002999556
FUKURA J. ET AL.: "ECT-02-71, 'Tatanshi Tsui F Gyoretsu ni yoru RC Polyphase Filter no Kaiseki", THE INSTITUTE OF ELECTRICAL ENGINEERS OF JAPAN KENKYUKAI SHIRYO, DENSHI KAIRO KENKYUKAI, ECT-02-66 TO 83, 5 July 2002 (2002-07-05), pages 23 - 26, XP002999557
Attorney, Agent or Firm:
Goto, Masaki (3-1 Kasumigaseki 3-chome, Chiyoda-k, Tokyo 13, JP)
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