METHOD AND APPARATUS FOR SAMPLING IN-PHASE AND QUADRATURE COMPONENTS
Assignee
MASSACHUSETTS INSTITUTE OF TECHNOLOGY, A CORP. OF MA
Filed
Sep 19, 1984
Granted
Dec 27, 1988
Location
Cambridge MA (Draper Lab/MIT)
Abstract
In-phase and quadrature components of a waveform are generated by sampling the waveform at a rate of four times the center frequency of the frequency band for which components are generated. The samples are digitized and applied to a digital 90° all-pass phase-splitting network. Each pair of output samples is generated as a function of input samples delayed by an even number of time instants through a first all-pass branch and delayed by an odd number of time instants through a second all-pass branch. A common network may form both branches by switching coefficients of a multiplier and alternating the output between in-phase and quadrature samples. The waveform may be shifted from a higher freqeuncy by a mixer and may be filtered prior to sampling.
Source: Google Patents
35 USC §181 Secrecy Order
Imposed
Feb 22, 1985
Rescinded
Jun 17, 1985
Duration
3 months
Inventor
- 1CHARLES M. RADER
Sensitive facility: Cambridge MA (Draper Lab/MIT)
Record Details
- Patent number
- US 4794556
- Application
- 06652297
- Aerospace match
- No
- Dataset source
- 35 USC §181 SO records