Dual conversion radio frequency transceiver
US6118984A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 1997 |
| Grant date | Sep 12, 2000 |
| Priority date | — |
| Expiry date | Apr 8, 2017 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/408
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
The present invention discloses a dual conversion RF transceiver which uses only one local oscillator for signal conversion to simplify system complexity and reduce production cost. The transceiver comprises a mixer for mixing input RF signals with first local oscillator signal to generate a first IF signal, an IF filter for filtering the first IF signal, a local oscillator for providing second local oscillator signal, a demodulator for demodulating the filtered first IF signal into first baseband signals by using the second oscillator signal, a baseband circuit for processing the first baseband signals and generating second baseband signals to be transmitted, a modulator for modulating the second baseband signals into a second IF signal by using the second local oscillator signal, and a frequency multiplier for multiplying the frequency of the second IF signal by a predetermined factor to generate a output RF signal. When the transceiver starts receiving the RF signals, the baseband circuit will produce a fixed baseband signal which will be modulated into fixed frequency signal by the modulator by using the second local oscillator signal. And the frequency of the fixed frequency s…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.