Title:
TRANSCONDUCTANCE AMPLIFIER
Document Type and Number:
WIPO Patent Application WO/2008/023530
Kind Code:
A1
Abstract:
A transconductance amplifier having a transconductance tunable in a wider range
while the linearity between the input voltage and output current over the whole
predetermined operation input range is maintained. An example of the invention
comprises a differential pair composed of source-grounded first and second
MOS transistors (111, 112), third and fourth transistors (113, 114) whose source
terminals are connected to the respective drain terminals of the first and second
transistors (111, 112), a voltage generating circuit (300) for outputting a
tuning voltage and a common voltage at a constant ratio of the common and tuning
voltages, and a differential pair input voltage generating circuit (320) which
receives the input voltage and the common voltage and outputs a voltage Vip and
a voltage Vin to the respective gate terminals of the first and second transistors
(111, 112). The gate terminal of the fourth transistor (114) is connected to
the gate terminal of the third transistors (113), and the tuning voltage is inputted
to both gate terminals.
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Inventors:
AIBA, Yusuke (1-2 Yuraku-cho 1-chome, Chiyoda-ku Tokyo, 40, 1008440, JP)
Application Number:
JP2007/064644
Publication Date:
February 28, 2008
Filing Date:
July 26, 2007
Export Citation:
Assignee:
Asahi Kasei EMD Corporation (23-7, Nishi-shinjuku 1-chome Shinjuku-k, Tokyo 23, 1600023, JP)
旭化成エレクトロニクス株式会社 (〒23 東京都新宿区西新宿一丁目２３番７号 Tokyo, 1600023, JP)
旭化成エレクトロニクス株式会社 (〒23 東京都新宿区西新宿一丁目２３番７号 Tokyo, 1600023, JP)
International Classes:
H03F3/34; H03F3/45; H03G3/10
Attorney, Agent or Firm:
TANI, Yoshikazu (6-20, Akasaka 2-chomeMinato-ku, Tokyo 52, 1070052, JP)
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