GAIN CONTROL

摘要

Despite the profusion of readily affordable digital-signal processors, available as free-standing components or as modules within more highly integrated devices, many applications still require analog-signal processing to provide the best combination of cost and performance. In such cases, VGAs (variable-gain amplifiers) allow products to adapt to changeable operating environments and excessive signal dynamics. Applications vary according , to signal bandwidth; linearity, distortion, and noise requirements; and several gain-control parameters, including control method, range, curve, granularity, and precision.