| 摘要 |
An automatic gain control system handles inphase and quadrature phase signals, and is for use in digital cellular radio receiver equipment. The system comprises an inphase signal path and a quadrature phase signal path, each path including a logarithmic attenuator (3,10), the inphase and quadrature phase signal paths each including a feedforward path including a logarithmic detector (5,13). The output of the detectors (5,13) are compared by respective comparators (8,15) with an analogue signal, and output signals from the comparators (8,15) are arranged to control a counter arrangement (16) which generates a data word which is used to control the performance of the logarithmic attenuators (3,10). |
