Title:
VARIABLE GAIN TRANSIMPEDANCE AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2015/146247
Kind Code:
A1
Abstract:
This transimpedance amplifier is provided with: a transistor (Q1) that has an emitter connected to a signal input terminal, a collector connected to a signal output terminal, and a grounded base; a constant current source (IS1) that has one end connected to the emitter of the transistor (Q1) and the other end connected to a negative-side power supply voltage; load resistances (RL1, RL2) that are connected in series between a positive-side power supply voltage and the collector of the transistor (Q1); and a variable current source (IS2) that has one end connected to a connection point of the load resistances (RL1, RL2) and the other end connected to the emitter of the transistor (Q1), and can control amperage in accordance with a variable gain control voltage (Vctl).
Inventors:
NAKANO SHINSUKE (JP)
NOGAWA MASAFUMI (JP)
NOSAKA HIDEYUKI (JP)
FUKUYAMA HIROYUKI (JP)
TOBAYASHI MASATOSHI (JP)
KURITA SHIGEHIRO (JP)
ENDO MASAHIRO (JP)
NOGAWA MASAFUMI (JP)
NOSAKA HIDEYUKI (JP)
FUKUYAMA HIROYUKI (JP)
TOBAYASHI MASATOSHI (JP)
KURITA SHIGEHIRO (JP)
ENDO MASAHIRO (JP)
Application Number:
PCT/JP2015/051459
Publication Date:
October 01, 2015
Filing Date:
January 21, 2015
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE (JP)
NTT ELECTRONICS CORP (JP)
NTT ELECTRONICS CORP (JP)
International Classes:
H03F3/08; H03F3/45; H03G3/10
Foreign References:
| US4560947A | 1985-12-24 | |||
| JPH0622171A | 1994-01-28 | |||
| JP2013005372A | 2013-01-07 |
Other References:
R. PELLERITI ET AL.: "A 2.3GHz SiGe RFIC front- end for U.S. satellite radio applications", DIGEST OF TECHNICAL PAPERS. ISSCC. 2005, February 2005 (2005-02-01), pages 436 - 437, XP031173833
Attorney, Agent or Firm:
YAMAKAWA, Masaki et al. (JP)
Masaki Yamakawa (JP)
Masaki Yamakawa (JP)
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