Digital Control of Analog Level
In many audio product designs, the level of an analog signal must be varied by a digital controller. This paper discusses several approaches to the design of circuits which accomplish this task. Stepped attentuators, such as multiplying digital-to-analog converters (MDACs) and switched resistor networks, as well as digitally controlled voltage-controlled amplifiers (VCAs) are discussed. The paper presents several criteria with which to evaluate different circuit implementations, and points out some of the merits and liabilities of each approach.
Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!
This paper costs $33 for non-members, $5 for AES members and is free for E-Library subscribers.