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:
Feb. 09, 2010
Filed:
Nov. 29, 2007
Chit Ah Mak, Fremont, CA (US);
Chun Fai Wong, Hong Kong, HK;
Lap Chi Leung, Hong Kong, HK;
Xiaofei Kuang, Hong Kong, HK;
Jennifer Shuet Yan Ho, Hong Kong, HK;
David Kwok Kuen Kwong, Davis, CA (US);
Chit Ah Mak, Fremont, CA (US);
Chun Fai Wong, Hong Kong, HK;
Lap Chi Leung, Hong Kong, HK;
Xiaofei Kuang, Hong Kong, HK;
Jennifer Shuet Yan Ho, Hong Kong, HK;
David Kwok Kuen Kwong, Davis, CA (US);
Abstract
A gain control circuit including a resistor with a first terminal and a second terminal; an operational amplifier with an inverting terminal thereof electrically coupled to said first terminal of said resistor; a non-inverting terminal thereof; and an output terminal thereof; an amplifier circuit for transforming the voltage change of said operational amplifier output into a substantially exponential current change; wherein the output of said amplifier circuit is electrically coupled to said inverting terminal of said operational amplifier. The above described gain control circuit is able to perform wide bandwidth input signal buffering with linearity under low voltage and low power conditions. The circuit also offers low output impedances without the need of additional buffers and hence minimizing circuit size and manufacturing costs.