Communications receivers
US6006081A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 30, 1996 |
| Grant date | Dec 21, 1999 |
| Priority date | — |
| Expiry date | Jan 30, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03D2200/0033
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A communications receiver such as an integrated zero IF receiver comprises an input for receiving an input signal and a zero IF frequency down conversion circuit coupled said input and constructed to provide quadrature related signals (I,Q) at a substantially zero intermediate frequency. In order to balance the signal paths, at least one capacitance in each of the quadrature related zero IF signal paths of the frequency down conversion circuit comprises at least two integrated capacitors connected in anti-parallel. By fabricating the integrated capacitances in this way the symmetry of the circuit is maintained which enhances significantly the second-order inter-modulation performance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.