Coded data generation or conversion – Analog to or from digital conversion – Analog to digital conversion
Patent
1992-11-06
1995-02-21
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Analog to digital conversion
341155, 341141, 327 65, 327334, H03M 114
Patent
active
053920457
ABSTRACT:
A folder circuit maps an analog input voltage to an analog output voltage in accordance with a folding function having at least one folding point. The folder circuit includes a power supply node and at least one input differential stage. Each input differential stage has a first input node to which is applied the input voltage, a second input node to which is applied a first reference voltage corresponding to that stage's folding point, and two differential output nodes. A resistive network is connected between the power supply node and the two differential output nodes, and a current source draws a predefined current from each input differential stage. An output network generates an analog output voltage as a function of the highest voltages on the differential output nodes of all the stages of the folder circuit. A current injection circuit provides a level-shifting current to each input differential stage through the two differential output nodes. A clamping circuit connected between the power supply node and each of the differential output nodes prevents saturation of the transistors in the input differential stages. A set of feedback paths in the resistive network interconnect each differential output node with neighboring ones of the differential output nodes to increase the gain of the folder circuit near each of the folding points.
REFERENCES:
patent: 3187325 (1965-06-01), Waldhauer et al.
patent: 3569746 (1971-03-01), Lacour et al.
patent: 4297679 (1981-10-01), Arbel et al.
patent: 4642482 (1987-02-01), Kasperkovitz et al.
patent: 4897656 (1990-01-01), van de Plassche et al.
patent: 4939517 (1990-07-01), Baltus et al.
patent: 5126742 (1992-06-01), Schmidt et al.
patent: 5138318 (1992-08-01), Matsuzawa
"A High-Speed 8 Bit A/D Converter Based on a Gray-Code Multiple Folding Circuit"; U. Fiedler et al.; IEEE Journal of Solid-State Circuits, vol. SC-14, No. 3, Jun. 1979; pp. 547-551.
"A Monolithic 8-Bit Video A/D Converter"; R. Van de Grift et al.; IEEE Journal of Solid-State Circuits, vol. SC-19, No. 3, Jun. 1984; pp. 374-378.
"An 8-bit Video ADC Incorporating Folding and Interpolation Techniques"; R. Van de Grift et al.; IEEE Journal of Solid-State Circuits, vol. SC-22, No. 6, Dec. 1987; pp. 944-953.
National Semiconductor Corporation
Williams Howard L.
LandOfFree
Folder circuit for analog to digital converter does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Folder circuit for analog to digital converter, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Folder circuit for analog to digital converter will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-1933952