| 摘要 |
A method for calibration of a signal receiver comprising automatic gain control circuits ( 201, 202 , . . . ) from which at least one has unknown characteristic and at least one has a known characteristic, wherein the signal receiver output signal (S 2 ) is input to a calibration block ( 203 ), in which control signals (AGC 1 , AGC 2 , . . . ) are generated for each automatic gain control circuit ( 201, 202 , . . . ), to set a required level of signal receiver output signal (S 2 ), according to the invention, is characterized in that the characteristic of each automatic gain control circuit of unknown characteristic is determined by the use of a constant input signal, by connecting to the signal receiver the input signal (S 1 ) of predetermined parameters, and, preferably in at least one measurement loop controlling the calibration block ( 203 ), the gains of automatic gain control circuits of known characteristics are changed by programmably-calculated values and next, using computations preformed in the calibration block ( 203 ) on the basis of the input (signal (S 1 ) level and gains of the circuits of known characteristics, points of characteristic of the circuit of unknown characteristic under measurement are determined and written to the memory block ( 204 ) as an individual calibration table for the circuit of unknown characteristic under measurement. The invention also refers to a method for calibration of a signal receiver comprising automatic gain control circuits, from which at least two have unknown characteristics. Preferably, the measurement loops are executed with changing the frequency of the signal receiver input signal (S 1 ). In another embodiment, the measurement loops are executed with changing the level of the signal receiver input signal (S 1 ). |
