An apparatus is disclosed for gain stabilization. In an example aspect, the apparatus includes an amplifier and a gain-stabilization circuit. The amplifier has a gain that is based on a bias voltage and an amplification control signal. The gain-stabilization circuit is coupled to the amplifier and includes a replica amplifier. The replica amplifier has a replica gain that is based on the bias voltage and the amplification control signal. The gain-stabilization circuit is configured to adjust at least one of the bias voltage or the amplification control signal based on a gain error associated with the replica amplifier.

An amplifier circuit includes a first terminal and a second terminal, an amplifier disposed in a first path connecting the first terminal and the second terminal, a first switch circuit disposed in the first path between the amplifier and the second terminal, an attenuator disposed in the first path between the amplifier and the first switch circuit, and a second switch circuit disposed in a second path that is connected to the first terminal and the second terminal while bypassing the amplifier, the attenuator, and the first switch circuit.

An amplifier circuit includes a first terminal and a second terminal, an amplifier disposed in a first path connecting the first terminal and the second terminal, a first switch circuit disposed in the first path between the amplifier and the second terminal, an attenuator disposed in the first path between the amplifier and the first switch circuit, and a second switch circuit disposed in a second path that is connected to the first terminal and the second terminal while bypassing the amplifier, the attenuator, and the first switch circuit.

An exemplary audio enhancement system substantially eliminates latency by returning audio input signals in amplified form directly in the analog domain to the source, thereby reducing signal degradation and removing redundancy from digital and analog audio transmission and processing architectures.

Techniques for optimizing a player based on the addition of a second player are disclosed. In an embodiment, when a first player no longer needs to play certain audio frequencies due to the addition of a second player, the gain of the first player is automatically increased as part of the setup process. In another embodiment, when a first player needs to play certain audio frequencies, for example due to the removal of a second player, the gain of the first player is automatically decreased. Many other embodiments are disclosed.

Techniques for optimizing a player based on the addition of a second player are disclosed. In an embodiment, when a first player no longer needs to play certain audio frequencies due to the addition of a second player, the gain of the first player is automatically increased as part of the setup process. In another embodiment, when a first player needs to play certain audio frequencies, for example due to the removal of a second player, the gain of the first player is automatically decreased. Many other embodiments are disclosed.

A modular stackable enclosure system is disclosed herein. The system includes a base structure including a cavity that includes a component mounting surface. The base structure also includes a plurality of modular ports configured to provide openings to the cavity. The base structure also includes a plurality of accessory mount interfaces, configured to receive a plurality of corresponding toolless-attachable accessory mounts. The system also includes a plurality of port plates, each configured to fit into a port of the plurality of modular ports. The system also includes a plurality of port plate attachments, each configured to fit into a corresponding port plate. The system also includes a cover, configurable to attach to the base structure, such that the cover is movable to cover or expose the cavity.

A dynamic amplifier includes a first output capacitor, a first switch, a current source, a second switch, a voltage detector, a third switch and a level shifter. The first switch is coupled between a first terminal of the first output capacitor and a voltage detection node. The second switch is coupled to the current source and the voltage detection node. The voltage detector is coupled to the voltage detection node and the first switch. The third switch is coupled between the voltage detection node and a power source. The level shifter is coupled to a second terminal of the first output capacitor.

A variable gain amplifier (1) includes: a signal transmission circuit (10, 20) including amplifying transistor units (11.sub.1 to 11.sub.N, and 21.sub.1 to 21.sub.N) connected in parallel between a signal input port (2P, 2N) and a signal output port (3P, 3N); a load circuit (40) connected between a supply line of power supply voltage (VDD) and an output end of the signal transmission circuit (10, 20); a signal short circuit (30) including a short-circuit transistor unit (31) connected between the supply line of the power supply voltage (VDD) and an input end of the signal transmission circuit (10, 20), a constant-current source circuit (42), and a transistor control circuit (46). The transistor control circuit (46) selects transistor units to be turned on, from among the amplifying transistor units (11.sub.1 to 11.sub.N, and 21.sub.1 to 21.sub.N) and the short-circuit transistor unit (31), and supplies control voltages for turning on the selected transistor units.

A variable gain amplifier (1) includes: a signal transmission circuit (10, 20) including amplifying transistor units (11.sub.1 to 11.sub.N, and 21.sub.1 to 21.sub.N) connected in parallel between a signal input port (2P, 2N) and a signal output port (3P, 3N); a load circuit (40) connected between a supply line of power supply voltage (VDD) and an output end of the signal transmission circuit (10, 20); a signal short circuit (30) including a short-circuit transistor unit (31) connected between the supply line of the power supply voltage (VDD) and an input end of the signal transmission circuit (10, 20), a constant-current source circuit (42), and a transistor control circuit (46). The transistor control circuit (46) selects transistor units to be turned on, from among the amplifying transistor units (11.sub.1 to 11.sub.N, and 21.sub.1 to 21.sub.N) and the short-circuit transistor unit (31), and supplies control voltages for turning on the selected transistor units.