Charge sharing time domain filter
US8717094B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 6, 2012 |
| Grant date | May 6, 2014 |
| Priority date | — |
| Expiry date | Jun 6, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H15/02
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
An approach to time domain filtering uses a passive charge sharing approach to implement an infinite impulse response filter. Delayed samples of an input signal are stored as charges on capacitors of a first array of capacitors, and delayed samples of the output signal are stored as charges on capacitors of a second array of capacitors. Outputs are determined by passively coupling capacitors of the first and second arrays to one another, and determining the output according to a total charge on the coupled capacitors. In some examples, a gain is applied to the total charge prior to storing the output on the second array of capacitors. In some examples, a charge scaling circuit is applied to the charges stored on the arrays prior to coupling capacitors to form the output.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.