Title:
ACTIVATION SIGNAL DETECTING CIRCUIT
Document Type and Number:
WIPO Patent Application WO/2007/063887
Kind Code:
A1
Abstract:
The nonlinearity effect of a rectifying element is enhanced, and further a resonant
circuit is used to enlarge the input amplitude. Furthermore, the rectifying
efficiency of a detection rectifier circuit is enhanced, thereby allowing the
gain of an amplifier circuit in the following stage to be set to a low value. Signals
having mutually opposite phases are inputted to RF input terminals (101,102).
The signal at the terminal (102) is then inputted to the gate of a transistor (M1)
via a capacitor (C3), while the signal at the terminal (101) is then inputted,
via a capacitor (C1), to a node (N1) to which the source of the transistor (M1) and
the gate and drain of a transistor (M2) are connected, whereby a capacitor (C2)
is charged with a half-wave voltage-doubled rectified current. DC biases are
inputted to terminals (301,302). There are formed series resonant circuits
(L1,C15;L2,C16). A plurality of half-wave voltage-doubled rectifier circuits
(M1,M2,C1-C3,R1) are connected in cascade.
Inventors:
MAEDA TADASHI (JP)
YAMASE TOMOYUKI (JP)
YAMASE TOMOYUKI (JP)
Application Number:
PCT/JP2006/323795
Publication Date:
June 07, 2007
Filing Date:
November 29, 2006
Export Citation:
Assignee:
NEC CORP (JP)
MAEDA TADASHI (JP)
YAMASE TOMOYUKI (JP)
MAEDA TADASHI (JP)
YAMASE TOMOYUKI (JP)
International Classes:
H03D1/18
Foreign References:
| JPH0435304A | 1992-02-06 | |||
| JP2005184175A | 2005-07-07 | |||
| JP2002152080A | 2002-05-24 |
Attorney, Agent or Firm:
MIYAZAKI, Teruo et al. (16th Kowa Bldg. 9-2, Akasaka 1-chome Minato-ku Tokyo 52, JP)
Download PDF: