Amplifier apparatus and method for controlling a local oscillator frequency based on the detected temperature of if bandpass filters
US6731919B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 2001 |
| Grant date | May 4, 2004 |
| Priority date | — |
| Expiry date | Sep 11, 2022 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B1/0475
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Disclosed is an amplifier apparatus that corrects mismatching of the filter transmission characteristic due to a change in the temperature of the amplifier apparatus itself and thereby stably amplifies the high-frequency signal. The amplifier apparatus converts a signal to be processed into one having an intermediate frequency band to thereby execute amplification processing. It comprises a local oscillator 31 the oscillation frequency of that can be altered, a first frequency converter 13 that converts the signal by the use of the oscillation frequency from the local oscillator into an intermediate frequency, a first band pass filter 14 that band-limits the signal having the intermediate, an amplifier 15 that amplifies the signal of the intermediate frequency that has passed therethrough, a second band pass filter 16 that band-limits the signal of the intermediate frequency that has been output therefrom, a second frequency converter 17 that converts the signal of the intermediate frequency that has passed therethrough into the original frequency by the use of the local-oscillation frequency, a temperature sensor 32 that detects the temperature of each of the first and second filt…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.