Fast infrared transceiver with reduced power consumption

摘要

A circuit and method to decrease power consumption of fast infrared links. Reduced power consumption allows continuous infrared standby in battery-powered (and other power-consumption sensitive) devices. A low speed, low power-consumption infrared receiver preamplifier is used in conjunction with a higher speed, higher power-consumption infrared receiver preamplifier. While the battery-powered device awaits an infrared transmission, the low power-consumption receiver preamplifier operates in standby mode and the high power-consumption receiver preamplifier is in shutdown mode. Because the higher power consumption receiver preamplifier is in shutdown mode, standby power consumption is reduced and time between battery recharging is increased. When the low power receiver preamplifier detects an infrared transmission, the high power receiver preamplifier can be activated if high-speed communication is needed. An alternative discloses dual receivers rather than dual preamplifiers in one receiver.