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:
Jul. 21, 2009
Filed:
Jun. 30, 2006
Takeo Suzuki, Fukushima-ken, JP;
Takeo Suzuki, Fukushima-ken, JP;
Alps Electric Co., Ltd., Tokyo, JP;
Abstract
Provided is an AGC circuit which is hard to be influenced by the level of an input signal. The AGC circuit includes an amplification elementwhich has an input terminalfor receiving an input signal Vin, a ground terminalconnected to ground through at least a first resistor RA, and an output terminalwhich is connected to a power supply source Vcc through at least a second resistor RB and amplifies and outputs the input signal Vin; an AGC voltage generating partwhich is provided at the subsequent stage of the amplification elementand outputs an AGC voltage according to the strength of the input signal as an analog signal; a signal converting partwhich digital-converts the AGC voltage into a AGC control signal Ato Bhaving a predetermined number of bits; a current negative feedback circuitwhich changes the impedance ZA of the ground terminal including the first resistor RA to adjust an gain; and a voltage dividing circuitwhich changes the impedance ZB of the output terminal including the second resistor RB to adjust the gain.