Patent ID: 6054896
Filing Date: 2000-04-25
Classification: H03F

Abstract:
In a transmitter in which an input transmission signal is separated into multiple component signals that are processed along respective amplification chains and then combined to form an output transmission signal, and in which the amplification chains include compensation processors which modify the component signals based on sets of compensation parameters to compensate for differences in analog components of the amplification chains, a controller, comprising:an adaptive compensation estimator which adaptively generates and updates the compensation parameters based on observations of signals within the transmitter; anda state machine which monitors a level of balance between the amplification chains and controls an operational mode of the transmitter, the state machine implementing at least the following states:(a) a first state in which training signals are generated and applied to the amplification chains while substantially inhibiting emissions from an antenna, and in which the adaptive compensation estimator uses the training signals to adaptively update the compensation parameters, and(b) a second state in which an input transmission signal is processed along the amplification chains to generate an output transmission signal, and in which the adaptive compensation estimator uses the input transmission signal to update the compensation parameters during transmission events to maintain the amplification chains in balance.