Abstract: An amplifier architecture using actively phase-matched feed-forward linearization includes: a first signal path having a scaling amplifier 40 in series with a main amplifier 42; a second signal path having a replica amplifier 44 in series with a correction amplifier 46; and a combining node 48 that combines the first signal path and the second signal path. This topology places the scaling amplifier 40 in the main signal path. By inverting the scaling factor from &bgr; to 1/&bgr;, this topology retains the distortion cancellation property while balancing the two signal paths. In this case the scaling amplifier 40 attenuates the input signal rather than amplifying it. The end result remains the same. The main amplifier output signal is lower than the replica amplifier's by a factor of &bgr;. This results in a third-order distortion component that is &bgr;3 times bigger at the replica amplifier output.

Abstract: A current feedback amplifier is disclosed for providing a differential output based on a single-ended or differential input signal, having first and second low impedance inputs to receive first and second input signals, and first and second phase shifting systems providing first and second phase shifted input signals based on the second and first input signals. A first intermediate system provides a first intermediate signal comprising the first input signal and the first phase shifted input signal, and a second intermediate system provides a second intermediate signal comprising the second input signal and the second phase shifted input signal, wherein gains may be applied to one or more of the input and/or phase shifted signals. The amplifier further comprises first and second output buffers providing first and second differential output signals based on the first and second intermediate signals, respectively.

Abstract: An amplifier architecture using actively phase-matched feed-forward linearization includes: a first signal path having a scaling amplifier 40 in series with a main amplifier 42; a second signal path having a replica amplifier 44 in series with a correction amplifier 46; and a combining node 48 that combines the first signal path and the second signal path. This topology places the scaling amplifier 40 in the main signal path. By inverting the scaling factor from &bgr; to 1/&bgr;, this topology retains the distortion cancellation property while balancing the two signal paths. In this case the scaling amplifier 40 attenuates the input signal rather than amplifying it. The end result remains the same. The main amplifier output signal is lower than the replica amplifier's by a factor of &bgr;. This results in a third-order distortion component that is &bgr;3 times bigger at the replica amplifier output.

Abstract: A current feedback amplifier is disclosed for providing a differential output based on a single-ended or differential input signal, having first and second low impedance inputs to receive first and second input signals, and first and second phase shifting systems providing first and second phase shifted input signals based on the second and first input signals. A first intermediate system provides a first intermediate signal comprising the first input signal and the first phase shifted input signal, and a second intermediate system provides a second intermediate signal comprising the second input signal and the second phase shifted input signal, wherein gains may be applied to one or more of the input and/or phase shifted signals. The amplifier further comprises first and second output buffers providing first and second differential output signals based on the first and second intermediate signals, respectively.