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:
Sep. 21, 2010
Filed:
Apr. 10, 2006
Hidehiko Kurimoto, Takarazuka, JP;
Hidehiko Kurimoto, Takarazuka, JP;
Panasonic Corporation, Osaka, JP;
Abstract
A receiver circuit includes a low noise amplifier (LNA)to which a received signal is input, a mixerfor mixing an output of the LNA and a local signal, a first low-pass filterfor receiving an output of the mixer, and a composite amplifier in which a fixed gain amplifier, a high-pass filter, and a gain control amplifierare connected in this order from the input side. An output of the first low-pass filter is input to the fixed gain amplifier. The gain of the fixed gain amplifier is 0 dB or more. The maximum gain of the gain control amplifier is 0 dB or less. The receiver circuit can suppress a transient response due to DC voltage fluctuations, even if the gains are changed while signals are received in a communication mode that performs continuous reception.