Driving a mixer with a differential lo signal having at least three signal levels
US9197161B2 · kind B2 · utility
5Cited by
8References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 3, 2009 |
| Grant date | Nov 24, 2015 |
| Priority date | — |
| Expiry date | Jan 1, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03K4/026
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The mixer of a transmit chain of a wireless transmitter (such as the transmitter of a cellular telephone handset) is driven with low third harmonic in-phase (I) and quadrature (Q) signals. The low third harmonic I and Q signals have three or more signal levels, and transition between the these three or more signal levels at times such that each of the I and Q signals approximates a sine wave and has minimal third harmonic spectral components. In one example, reducing the third harmonic components of the I and Q signals simplifies design of amplifier stages of the transmitter and helps reduce receive band noise.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.