| 摘要 |
The invention relates to a method and a circuit arrangement for processing a received signal in a direct conversion receiver. The invention can be preferably applied in mobile stations which are used in digital, time-division cellular systems. A direct voltage component of a signal which has been received and converted to a baseband is separated by the first separating means (6) of direct voltage in a signal line and additionally, the direct voltage components of both the signal preceding the separating means and the signal following the separating means are controlled by control signals (DCN1, DCN2). Thus the baseband signal line (4, 5) preceding the first separating means (6) can be implemented essentially as direct voltage coupled. The control circuit (5) of signal strength preceding said first separating means (6) comprises preferably a second separating means (9) for separating the direct voltage component occurring in the control circuit (5) from the constant potential of the circuit arrangement such as the ground level. Then one of said control signals (DCN1) has been preferably arranged to control the charge state of the second separating means (9). The baseband signal following the separating means is converted preferably into a digital form for further processing of the signal.
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