Accession Number : ADD015862

Title :   Precision Digitally-Controlled Variable Attenuation Circuit.

Descriptive Note : Patent, Filed 1 Nov 91, patented 4 May 93,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Atwood, Kenneth L ; Kim, Hyun S ; Lee, Kang M

Report Date : 04 May 1993

Pagination or Media Count : 9

Abstract : A precise digitally-controlled variable attenuation circuit for adjusting the attenuation of a signal in an external circuit includes a signal magnitude detector, a resistance adjustment control, and a resistance divider network. The signal magnitude detector has lower and upper threshold limits representing a desired range of attenuation and is operable to receive and compare a control signal with the lower and upper threshold limits, and, in response thereto, produce either a first signal if the control signal is less than the lower threshold limit or a second signal if the control signal is greater than the upper threshold limit. The adjustment control is capable of receiving the first and second signals and is operable to produce either a digital count-down signal in response to the first signal or a digital count-up signal in response to the second signal. The resistance divider network has a fixed resistance and a digitally-adjustable device with a variable resistance.

Descriptors :   *CIRCUITS, *CONTROL SYSTEMS, *PATENTS, ATTENUATION, CONTROL, DETECTORS, EXTERNAL, RESISTANCE, RESPONSE, SIGNALS, VARIABLES, PRECISION, LOOPS

Subject Categories : Electrical and Electronic Equipment

Distribution Statement : APPROVED FOR PUBLIC RELEASE