Title:
ACTIVE BAND-PASS FILTER
Document Type and Number:
Japanese Patent JP3343944
Kind Code:
B2
Abstract:
PURPOSE: To provide a small-sized and practical active BPF by setting the unloaded Q of an active feedback resonator to a minus area.
CONSTITUTION: A ratio of strength Qe1 of input-side coupling to strength Qe2 of output-side coupling of an amplifier 18 is caused to coincide with a gain G of the amplifier 18 to design a minimum noise temperature. When Qe1, Qe2, and G are adjusted to design the overall unloaded Q in the minus area, NF (noise figure) is improved. The noise temperature is defined with the temperature, at which a certain white noise power No is generated from a standard resistor, as 290°k. The value of the minus term in the right side of the equation is made larger than (1/Q60+1/Qe1+1/Q2) to set the unloaded Q of the active BPF to the minus area.
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Inventors:
Youhei Ishikawa
Hidaka Seoji
Hidaka Seoji
Application Number:
JP19039892A
Publication Date:
November 11, 2002
Filing Date:
July 17, 1992
Export Citation:
Assignee:
MURATA MANUFACTURING CO.,LTD.
International Classes:
H01P1/20; H01P7/10; (IPC1-7): H01P1/20; H01P7/10
Domestic Patent References:
| JP6359002A |
Attorney, Agent or Firm:
Yoshito Yamada