A-O Excisor.
Abstract
A 100 element silicon integrated circuit photosensor array has been developed that when used with a coherent A-O processor allows the real-time excision of narrow band interferers (1MHz) over a large instantaneous bandwidth (100MHz). The fundamental operations necessary to perform this task are the transformation of the signal to the frequency domain (retaining both amplitude and phase), point-by-point multiplication by a prescribed excision function, H(f), and transformation back into the time domain. The combined system of the sensor array, which provides the excision function and conversion to the time domain, and the coherent A-O processor, which Fourier transforms the signal from the time domain to the frequency domain, provides the function of a programmable notch filter. Two designs of the photosensor excisor have been built and tested. They are both contained on the 5066 mask set. The more conventional design consists of a linear array of 100 photodiodes connected to two output buses through a bank of MOS transistor switches. In the second design, the photodetector's output signals are steered to the preselected summing bus by electric field switches which have a wideband frequency response.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1979
- Accession Number
- ADA142192
Entities
People
- F. Kub
- G. M. Borsuk
- M. Randolph