Upward-folding successive-approximation optical analog-to-digita

Details Upward-folding successive-approximation optical analog-to-digita Upward-folding successive-approximation optical analog-to-digita

1998-08-11

2000-09-19

Tokar, Michael

Coded data generation or conversion

Analog to or from digital conversion

Using optical device,

341155, H03M 100

Patent

active

06121907&

ABSTRACT:
An optical analog-to-digital converter (10) which fully operates in the optical domain and utilizes an upward-folding successive approximation approach for conversion. The converter (10) includes a plurality of optical stages (14, 16, 18) where each stage (14, 16, 18) generates a digital bit. Each stage (14, 16, 18) includes an optical threshold switch (30, 56, 78) that sets the bit high when the switch (30, 56, 78) is closed. When a sample amplitude of the analog signal is compared to a threshold value and found to exceed the threshold value, the bit is set to "high" and the sample is passed directly onto the next stage (14, 16, 18). If the sample amplitude is found to be less than the threshold value, the bit is set to "low" and an intensity equal to the maximum signal intensity minus the threshold intensity is added to the sample amplitude. Each successive stage (14, 16, 18) compares the normalized signal sample to thresholds growing closer and closer to the maximum signal intensity. Multiple bits can be obtained by cascading stages.

REFERENCES:
patent: 4441096 (1984-04-01), Evanchuk
patent: 4712089 (1987-12-01), Verber
patent: 4864522 (1989-09-01), Heimgartner et al.
patent: 4947170 (1990-08-01), Falk
patent: 5315422 (1994-05-01), Utaka et al.
patent: 5675428 (1997-10-01), Henmi

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