Pad

The Π pad (pi pad) is a specific type of attenuator circuit in electronics whereby the topology of the circuit is formed in the shape of the Greek capital letter pi (Π). Attenuators are used in electronics to reduce the level of a signal. They are also referred to as pads due to their effect of padding down a signal by analogy with acoustics. Attenuators have a flat frequency response attenuating all frequencies equally in the band they are intended to operate. The attenuator has the opposite task of an amplifier. The topology of an attenuator circuit will usually follow one of the simple filter sections. However, there is no need for more complex circuitry, as there is with filters, due to the simplicity of the frequency response required. Circuits are required to be balanced or unbalanced depending on the geometry of the transmission lines with which they are to be used. For radio frequency applications, the format is often unbalanced, such as coaxial. For audio and telecommunications, balanced circuits are usually required, such as with the twisted pair format. The Π pad is intrinsically an unbalanced circuit. However, it can be converted to a balanced circuit by placing half the series resistance in the return path. Such a circuit is called a box section because the circuit is formed in the shape of a box.

Pad or pads may refer to: ===Input devices=== Gamepad, joypad, or controller, an input device used in gaming Graphics pad, a computer input device Keypad, buttons arranged in a block Touchpad or trackpad, a pointing device featuring a tactile sensor Trigger pad, an electronic sensor on a drum ===Other hardware=== Contact pad, the designated surface area for an electrical contact A resistive pad used in an attenuator An electronic notebook A tablet computer GridPad, the first commercially successful tablet computer iPad, a tablet computer made by Apple ThinkPad, a laptop brand first designed and produced by IBM, but now owned by Lenovo WatchPad, discontinued IBM smartwatch line WorkPad, discontinued line of PDA, branded by IBM ===Other uses in computing and electronics=== One-time pad, a method of cryptography ==Music== Pad, some holes of woodwind instruments (clarinets, saxophones...) are closed by air-tight pads. Soft, mellow timbres generated by synthesisers are often called pads, and are generally used as backing sounds. ==Other uses== Part of a mammal's paw Pad, Roane County, West Virginia A paper notebook San Diego Padres, a Major League Baseball team nicknamed the "Pads" ==See also== PADS (disambiguation) PAD (disambiguation) PADD Padding (disambiguation)

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