The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 19, 2009
Filed:
Dec. 15, 2004
Hisanori Uda, Nagoya, JP;
Hiroaki Hayashi, Nagoya, JP;
Yoshiyuki Kago, Nishio, JP;
Yukiomi Tanaka, Takahama, JP;
Kazuhiko Endo, Toyota, JP;
Hisanori Uda, Nagoya, JP;
Hiroaki Hayashi, Nagoya, JP;
Yoshiyuki Kago, Nishio, JP;
Yukiomi Tanaka, Takahama, JP;
Kazuhiko Endo, Toyota, JP;
Denso Corporation, Kariya, JP;
Abstract
With a capacitor C inserted in an interstage portion of multiple stages of amplifier circuits, a high pass filter is generated by the capacitor C and an input impedance |Z| of an amplifier circuit in the next stage. Accordingly, frequency components lower than a cutoff frequency fc are cut off, and therefore are not transferred to the subsequent stage. However, radio frequency components higher than or equal to a fundamental wave component determined by an envelope of a radio frequency signal intermittently transmitted can be transferred. Consequently, transfer of DC offset potentials can be cut off, and noise, such as flicker noise, having great power in a DC or near-DC zone can be effectively cut off. Thereby, the S/N ratio, detection sensitivity, and detection accuracy can be improved.