Reducing pass-band ripple in radio-frequency (RF) filters used for pass-band filtering in a wireless communications system
US9281975B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 12, 2014 |
| Grant date | Mar 8, 2016 |
| Priority date | — |
| Expiry date | Sep 2, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04W84/12
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An electronically tunable equalizer is provided to a downlink (DL) and/or uplink (UL) signal processing path of a wireless communication unit incorporating a RF filter. The electronically tunable equalizer is pre-configured with a plurality of capacitance states, each representing a specific capacitance. The equalizer produces a different equalizer response for each of the plurality of capacitance states based on a received pass-band frequency signal. The plurality of equalizer responses is provided to the RF filter on a signaling processing path, thus affecting the RF filter's pass-band ripple. The RF filter's pass-band ripple is measured for each of the plurality of equalizer responses to determine a desired pass-band ripple. By configuring the electronically tunable equalizer to the capacitance state that produced the desired pass-band ripple, a ceramic RF filter may be used in the wireless communication unit for the benefit of lower cost and size, with reduced pass-band ripple.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.