Title:
FREQUENCY CONVERTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2007/108163
Kind Code:
A1
Abstract:
A single constant current source (IO) is connected, in a common source
fashion, to first and second differential amplifiers (10I,10Q)
that perform a differential amplification based on the same input signal. The
single constant current source (IO) is used to drive both of the differential
amplifiers (10I,10Q), thereby establishing an appropriate
gain of each of the differential amplifiers (10I,10Q) so
as to obtain a desired noise factor (NF). Additionally, the arrangement in which
these differential amplifiers (10I,10Q) operate only
by use of the single constant current source (IO) can suppress the increase
of current consumption though the two differential amplifiers are existent.
Inventors:
ISHIGURO KAZUHISA (JP)
TAKAHASHI YOSHIAKI (JP)
TAKAHASHI YOSHIAKI (JP)
Application Number:
PCT/JP2006/322685
Publication Date:
September 27, 2007
Filing Date:
November 08, 2006
Export Citation:
Assignee:
NIIGATA SEIMITSU CO LTD (JP)
RICOH KK (JP)
ISHIGURO KAZUHISA (JP)
TAKAHASHI YOSHIAKI (JP)
RICOH KK (JP)
ISHIGURO KAZUHISA (JP)
TAKAHASHI YOSHIAKI (JP)
International Classes:
H03D7/12; H03D7/14
Foreign References:
| JP2001257538A | 2001-09-21 | |||
| JP2003060441A | 2003-02-28 |
Attorney, Agent or Firm:
TACHIBANA, Kazuyuki (1-4 Kojimachi, Chiyoda-k, Tokyo 83, JP)
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