GEORGE JOSEPH THOMAS IV
Pilots at Kensington St, Longmont, CO
License number
Colorado A5302583
Issued Date
Mar 2016
Expiration Date
Mar 2021
Category
Airmen
Type
Authorized Aircraft Instructor
Address
Address
410 Kensington St APT 1, Longmont, CO 80504
Professional information
Digital-To-Analog Converter
US Patent:
4484178, Nov 20, 1984
Filed:
Jun 22, 1982
Appl. No.:
6/391059
Inventors:
Jeffrey L. Lovgren - Rochester MN
George C. Thomas - Longmont CO
John T. Trnka - Rochester MN
George C. Thomas - Longmont CO
John T. Trnka - Rochester MN
Assignee:
International Business Machines Corporation - Armonk NY
International Classification:
H03K 1302
US Classification:
340347DA
Abstract:
The digital-to-analog converter described herein generates an analog signal level from a digital value and a modulation coefficient. The converter modulates the digital word applied to the conversion stages and smoothes the resultant duty cycle modulated analog levels to produce additional analog levels between the normal levels provided by the conversion stages of the DAC. In one embodiment the duty cycle modulation of the digital value is accomplished by a rate multiplier controlling the incrementing of the digital word applied to the conversion stages. In another embodiment of the invention, the duty cycle modulation of the digital word is performed by a microcomputer. A low pass filter or a DC motor is used to smooth or filter the duty cycle modulated levels from the conversion stages.