Patent ID: 6442380
Filing Date: 2002-08-27
Classification: H03G

Abstract:
A zero intermediate frequency radio device comprising:an antenna for receiving a radio frequency signal, said radio frequency signal exhibiting a high dynamic range; a frequency down converter for down converting said radio frequency signal to a zero intermediate frequency signal, said frequency down converter comprising a mixer, an AC-coupler, and a received signal strength indicator with a signal resolving range that is below said high dynamic range, said AC-coupler being coupled to an output of said mixer; a signal processor for processing said zero intermediate frequency signal; at least one amplifier coupled between said antenna and said signal processor; and an automatic gain controller for at least gain controlling said at least one amplifier, said automatic gain controller being configured to set a gain of said at least one amplifier by setting said gain to a predetermined gain, by waiting a predetermined time for allowing DC-offset signals in said radio device to decay, by checking whether a reading of said received signal strength indicator is within said signal resolving range, and by setting said gain in accordance with said reading if said reading is within said signal resolving range.