Pulse modulator and pulse modulation method
US7639757B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 6, 2004 |
| Grant date | Dec 29, 2009 |
| Priority date | — |
| Expiry date | Jan 2, 2026 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03M7/3031
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A pulse modulator has a subtraction stage that produces a control error signal from the difference between a complex input signal and a feedback signal. A signal conversion stage converts the control error signal to a control signal. The control signal is multiplied by a complex mixing signal at the frequency ω0 in a first multiplication stage. At least one of the real and imaginary parts of the up-mixed control signal is then quantized by a quantization stage to produce a real pulsed signal. The pulsed signal is then employed to produce the feedback signal for the subtraction stage in a feedback unit. The pulse modulator according to the invention allows the range of reduced quantization noise to be shifted toward a desired operating frequency ω0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.