Patent ID: 7759915
Filing Date: 2010-07-20
Classification: G05F,H02M

Abstract:
1. An apparatus comprising: a transceiver circuit having a first portion that receives power through a first power supply node and a second portion that receives power through a second power supply node; a first linear regulator configured to receive an intermediate voltage and provide a first regulated voltage at the first power supply node; a switching regulator configured to provide the intermediate voltage to the first linear regulator, wherein the intermediate voltage is provided at an intermediate power supply node; a second linear regulator configured to provide a second regulated voltage at the second power supply node; and a battery coupled to provide a source of power to the switching regulator, wherein the first and second linear regulators are configured to substantially minimize noise at the second power supply node, and wherein a switching frequency of the switching regulator is dependent upon whether the transceiver circuit is operating in a transmission mode or in a receiving mode.