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:
Jan. 14, 2003
Filed:
Sep. 27, 2000
Mohandas Palathol Mana Sivadasan, Bangalore, IN;
Anil Agarwal, Bangalore, IN;
Cypress Semiconductor Corporation, San Jose, CA (US);
Abstract
One embodiment of the present invention is an improved feedback amplifier circuit having a variable closed loop gain which avoids including switching elements in its feedback network and maintains a constant output voltage window for an input signal having a wide dynamic range. That is, the switching elements are not on the active feedback path (e.g., they are isolated from the active feedback path). In this manner, the gain of the amplifier circuit may be determined only by the feedback resistance which can be more easily controlled through the use of precision resistors. Additionally, by removing the switches from the feedback network, the parasitics associated with each switch may also be removed from the feedback path of the amplifier circuit. Accordingly, the bandwidth of the feedback amplifier circuit can be controlled more effectively. Specifically, the present embodiment avoids locating the switching functionality in the feedback network by changing the output stage of the feedback amplifier circuit. In other words, the switching functionality of the present embodiment is located within the output stage of the feedback amplifier circuit. Furthermore, it is appreciated that the present embodiment provides a way to isolate the unused feedback path of the feedback amplifier circuit which has a variable closed loop gain.