Ramp circuit to reduce spectral regrowth of power amplifiers
US6603335B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jun 11, 2002 |
| Grant date | Aug 5, 2003 |
| Priority date | — |
| Expiry date | Jun 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K17/163
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A circuit for controlling a high frequency power amplifier for amplifying a signal for wireless transmission is disclosed. The circuit provides a control signal to the power amplifier at an output port thereof. The control signal has properties of rise time and fall time, where a delayed transition in this signal is based on charging and discharging of the capacitor using two current mirror circuits in order to provide the delayed transition. An advantage lies in that the time of this delayed transition is dependent primarily upon the current mirrors and substantially other than dependent upon the RC time constant of the circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.