DISCRETE GAIN CONTROLLED AMPLIFIER
Original Publication Date: 1990-Mar-01
Included in the Prior Art Database: 2001-Nov-15
Digital gain control of amplifier circuits is required in the design of many linear circuits. This can be achieved by digitally selecting various feedback resistors, usually employing a DAC, to modify the gain of an op amp circuit. Such a design is limited to low power output, which must be amplified by additional analog circuitry, requires multiple supply voltages, and expensive components.