Multiple-band mobile transceiver having a smaller number of local oscillators
US5966666A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1997 |
| Grant date | Oct 12, 1999 |
| Priority date | — |
| Expiry date | Feb 6, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/403
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
A frequency synthesizer consists of a voltage-controlled oscillator and a frequency division and distribution section. The frequency division and distribution section, which splits an oscillation signal of the voltage-controlled oscillator into a transmission modulation local oscillation signal and a reception second local oscillation signal while frequency-dividing the oscillation signal of the voltage-controlled oscillator, includes two pairs of frequency dividers and two switches. The frequency division numbers of the two pairs of frequency dividers are so set as to accommodate all the combinations of mobile communications systems and the transmission modulation local oscillation signal/reception second local oscillation signal. The two switches are switched in accordance with a mobile communications system for which a mobile transceiver is operating. The two local oscillation signals are input to a quadrature modulator and a quadrature demodulator, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.