Abstract: An amplifier arrangement including a main amplifier to which feed-forward cancellation is applied, where the amplifier arrangement comprises an input for receiving signals to be amplified, an output for providing an amplified input signal, a pilot signal modulation circuit to generate a CW frequency shifted pilot signal, a mixer down for converting the pilot signal to an IF signal, and a sampling circuit for digitally sampling the IF signal. The amplifier arrangement includes a signal cancellation loop and a distortion cancellation loop each acting as an independent control function for minimizing pilot signal. The signal cancellation loop utilizes a Cartesian loop method for controlling the signal cancellation loop for sensing both phase and amplitude information simultaneously. The Cartesian loop uses a high frequency active mixer, which is a dual cross coupled differential pairs of devices capable of operating with input signals from near DC to 2.4 GHz, for control of the signal cancellation loop.

Abstract: An amplifier arrangement including a main amplifier to which feed-forward cancellation is applied, where the amplifier arrangement comprises an input for receiving signals to be amplified, an output for providing an amplified input signal, a pilot signal modulation circuit to generate a CW frequency shifted pilot signal, a mixer down for converting the pilot signal to an IF signal, and a sampling circuit for digitally sampling the IF signal. The amplifier arrangement includes a signal cancellation loop and a distortion cancellation loop each acting as an independent control function for minimizing pilot signal. The signal cancellation loop utilizes a Cartesian loop method for controlling the signal cancellation loop for sensing both phase and amplitude information simultaneously. The Cartesian loop uses a high frequency active mixer, which is a dual cross coupled differential pairs of devices capable of operating with input signals from near DC to 2.4 GHz, for control of the signal cancellation loop.

Abstract: This invention relates to the Linearization of multitone or multiple signal amplifiers or like devices. The telecommunications industry is currently employing amplifiers, transmitters or other active devices that are not only amplifying complex digital and analog modulation formats, but are transmitting or amplifying multiple complex signals simultaneously. In order to meet the transmission requirements, amplifiers or transmitters must exhibit extreme phase and amplitude linearity. Deviations from linearity are distortions which lead to intermodulation of the signal components; those intermodulation products appear variously through out the spectrum and cause interference between signals, which in turn degrades the amplified signals. Today the amplification of these signals requires the use of feedforward technology to achieve the performance required to meet government spectrum modulation mask requirements. This invention provides an important advance in the art of extreme phase and amplitude linearity.