Data encryption for suppression of data-related in-band harmonics in digital to analog converters
US7068788B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 10, 2001 |
| Grant date | Jun 27, 2006 |
| Priority date | — |
| Expiry date | Mar 10, 2024 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04K1/02
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
The present invention is related to digital to analog converter (DAC) input data encryption off-chip and decryption on-chip to suppress input data in-band harmonic leakage through package related parasitic capacitance. More specifically, the present invention relates to the method and apparatus of input data encryption off-chip by forming the logical exclusive-OR of the raw data and a random single bit data stream. The encrypted data is then read onto the DAC chip where the data is decrypted using identical circuitry and an identical random single bit data stream. The off-chip encryption isolates harmonic content within the input data, preventing leakage of input data harmonic content through IC package-related parasitic capacitance into DAC outputs. Any leakage appears as an increase in spectral noise rather than output distortion and as such, has a much smaller impact on DAC narrow band linearity.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.