Transmission circuit
US6377630B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 16, 1999 |
| Grant date | Apr 23, 2002 |
| Priority date | — |
| Expiry date | Mar 16, 2019 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L27/02
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
A transmission circuit comprises a fixed-frequency oscillator for oscillating a frequency for the transmission, a voltage controlled oscillator for outputting a signal containing a modulation signal component, a frequency mixer for mixing an output signal of the fixed-frequency oscillator and an output signal of the voltage controlled oscillator, a high-frequency amplifier for amplifying output of the frequency mixer and supplying the amplified signal to a transmission antenna, and a power control circuit for first turning on power of the voltage controlled oscillator and the high-frequency amplifier at the beginning of the transmission and after expiration of a predetermined time, turning on power of the fixed-frequency oscillator.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.