Title:
TRACKING BANDPASS FILTER
Document Type and Number:
WIPO Patent Application WO/2012/160612
Kind Code:
A1
Abstract:
This tracking bandpass filter having a predetermined passband is provided with: a resistance circuit (10) having a first terminal connected to a signal input terminal (1) of the tracking bandpass filter; an inductor circuit (2) having a first terminal connected to a second terminal of the resistance circuit (10); a resonance frequency control circuit (11), which is configured such that a first terminal is connected to a second terminal of the inductor circuit (2), a second terminal is connected to a power supply, and a capacitance value is variable; and a differential circuit (14), in which first and second input terminals are connected to the first and the second terminals of the resistance circuit (10), respectively, and an output terminal is connected to a signal output terminal (5) of the tracking bandpass filter.
Inventors:
TABATA YOSHIHIDE
OBA YASUO
YAO YASUHISA
OBA YASUO
YAO YASUHISA
Application Number:
PCT/JP2011/004705
Publication Date:
November 29, 2012
Filing Date:
August 24, 2011
Export Citation:
Assignee:
PANASONIC CORP (JP)
TABATA YOSHIHIDE
OBA YASUO
YAO YASUHISA
TABATA YOSHIHIDE
OBA YASUO
YAO YASUHISA
International Classes:
H04B1/30; H03H1/00; H04B1/18
Domestic Patent References:
| WO2007145127A1 | 2007-12-21 |
Foreign References:
| JP2568571B2 | 1997-01-08 | |||
| JP2007295256A | 2007-11-08 |
Attorney, Agent or Firm:
MAEDA, Hiroshi et al. (JP)
Hiroshi Maeda (JP)
Hiroshi Maeda (JP)
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Claims: