| US 7,570,182 B2 | ||
| Adaptive spectral noise shaping to improve time to digital converter quantization resolution using dithering | ||
| Mahbuba Moyeena Sheba, Richardson, Tex. (US); Robert B. Staszewski, Garland, Tex. (US); and Khurram Waheed, Plano, Tex. (US) | ||
| Assigned to Texas Instruments Incorporated, Dallas, Tex. (US) | ||
| Filed on Sep. 11, 2007, as Appl. No. 11/853,182. | ||
| Claims priority of provisional application 60/825838, filed on Sep. 15, 2006. | ||
| Prior Publication US 2008/0068236 A1, Mar. 20, 2008 | ||
| Int. Cl. H03M 1/06 (2006.01) | ||
| U.S. Cl. 341—118 [341/143] | 42 Claims |
| 1. A method of adaptively reducing quantization noise in a closed loop control system, said method comprising the steps of:
providing a reference analog quantity;
providing a variable analog quantity;
applying dithered spectral noise shaping to said reference analog quantity to generate a reference noise shaped quantity;
calculating a quantized difference between said reference noise shaped quantity and said variable analog quantity; and
filtering said quantized difference to obtain a control signal of said variable analog quantity;
wherein said step of applying comprises shifting quantization noise of said reference noise shaped quantity outside a loop
bandwidth of said control system.
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