Coded data generation or conversion – Analog to or from digital conversion – Differential encoder and/or decoder
Patent
1991-03-12
1992-07-28
Williams, Howard L.
Coded data generation or conversion
Analog to or from digital conversion
Differential encoder and/or decoder
341172, 333173, H03M 302
Patent
active
051344017
ABSTRACT:
A delta signma modulator is programmable to realize a number of different gain settings. A user of the delta sigma modulator (which may be a human or an electronic system) may select a setting among a plurality of available settings. Programmability of gain is realized by selectively controlling the rate of sampling of an analog input relative to the rate of sampling of a reference voltage and/or by controlling interspersing of samples of fixed voltage with the analog input or reference voltage. To effect a positive gain, the rate of sampling of the analog input is selected to the bar larged than that of the rate of sampling of the known reference voltage. Alternatively, or additionally, fixed voltage charge samples are interspersed with the reference. In contrast, to effect a negative gain, the rate of sampling of the analog input is set to be less than the rate of sampling of the reference voltage and/or samples of fixed voltage are interspersed with the analog input. Lastly, to effect no net gain, the rate of sampling of the analog input is set to be substantially equal to the rate of sampling of the reference voltage.
REFERENCES:
patent: 3815033 (1974-06-01), Tewksbury
patent: 4378538 (1983-03-01), Gignoux
patent: 4429285 (1984-01-01), Bradshaw
patent: 4446438 (1984-05-01), Chang et al.
patent: 4896156 (1990-01-01), Gaverick
patent: 4939516 (1990-07-01), Early
Caves, et al.; Sampled Analog Filtering Using Switched Capacitor as Resistor Equivalents; Dec. 1977, IEEE Journal of Solid State Circuits vol. SC12 pp. 592-599.
Hosticka, et al.; MOS Sampled Data Recursive Filters Using Switched Capacitor Integrators; IEEE Journal of Solid State Circuits, vol. SC-12, No. 6 pp. 600-608, Dec. 1977.
McCartney Damien
Welland David R.
Analog Device, Inc.
Williams Howard L.
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