Title:
RADIO FILTER CIRCUIT AND NOISE REDUCING METHOD
Document Type and Number:
WIPO Patent Application WO/2006/117943
Kind Code:
A1
Abstract:
A filter circuit wherein NF of a Gm-C filter is improved. There are included a filter part that comprises a first capacitance and at least one first transconductance amplifier the mutual conductance of which varies in accordance with a first control signal; a second transconductance amplifier the mutual conductance of which is controlled by the first control signal; a third transconductance amplifier the mutual conductance of which is controlled by a second control signal; and a second capacitance connected to the outputs of the first and second transconductance amplifiers and to the input of the filter part.
Inventors:
OKADA HIROYUKI (JP)
Application Number:
PCT/JP2006/305670
Publication Date:
November 09, 2006
Filing Date:
March 22, 2006
Export Citation:
Assignee:
NEC CORP (JP)
OKADA HIROYUKI (JP)
OKADA HIROYUKI (JP)
International Classes:
H03H11/04
Foreign References:
| JP2002198778A | 2002-07-12 | |||
| JP2003347866A | 2003-12-05 | |||
| JPH05114836A | 1993-05-07 | |||
| JP2001292051A | 2001-10-19 |
Attorney, Agent or Firm:
Miyazaki, Teruo (16th Kowa Bldg. 9-20, Akasaka 1-chom, Minato-ku Tokyo, JP)
Download PDF: