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:
Apr. 11, 2006
Filed:
Mar. 27, 2002
Masataka Nakamura, Hiroshima, JP;
Takayuki Genba, Hiroshima, JP;
Yuichiro Aomori, Hiroshima, JP;
Shuji Yamaoka, Hiroshima, JP;
Masataka Nakamura, Hiroshima, JP;
Takayuki Genba, Hiroshima, JP;
Yuichiro Aomori, Hiroshima, JP;
Shuji Yamaoka, Hiroshima, JP;
OHT, Inc., Hiroshima, JP;
Abstract
Disclosed is a low-noise active RC signal processing circuit, which comprises a feedforward section operable responsive to an input signal to provide an output at a predetermined gain, and a feedback section operable responsive to the output of the forward circuit to negatively feed back the output to the input signal of the feedforward section while giving a predetermined transfer characteristic to the output, so as to allow the processing circuit to have a transfer impedance characteristic equal to or less than the predetermined gain over the entire frequency range. The feedforward section is composed of a current-controlled voltage output circuit which includes a common-base transistor for receiving and inverting the input signal, and an emitter-follower transistor for outputting voltage, and has a transfer impedance defining the predetermined gain. The current-controlled voltage output circuit may also be constructed using an operational amplifier. Various filters, such as a bandpass, lowpass or highpass filter, can be achieved by arranging the transfer impedance characteristic. The present invention can provide an active RC signal processing circuit having a low Q-value and an excellent low-noise performance.