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US 2004/0070449 A1Published application
Amplifier linearisation
AssigneeNokia Corporation
InventorsElias Pekonen, Andrzej Haczewski, Jaspal Bhari
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AssigneeNokia Corporation
InventorsElias Pekonen, Andrzej Haczewski, Jaspal Bhari
Estimating the term…
The present invention relates to a lineariser for use with an amplifier and to a method of linearising an amplifier. The lineariser comprises an input to receive an input signal and an output for outputting an adjusted signal. A gain variations adjustment means are provided for adjusting amplitude dependent gain variations of the signal. A phase variations adjustment means are provided for adjusting amplitude dependent phase variations of the signal. Said gain and phase variations adjustment means are adapted to be individually adjustable elements on the signal path between said input and output. A variable gain amplifier is provided on the signal path between the gain variations adjustment means and phase variations adjustment means. The adjusted signal is then input to said amplifier.
A lineariser for use with an amplifier comprising:
A lineariser as claimed in any preceding claim, wherein said variable gain amplifier is for shifting the transfer characteristic curves of the amplitude dependent phase and gain variations relative to each other.
A lineariser as claimed in any preceding claim, wherein a second variable gain amplifier is provided for adjusting the power level of the signal to be input in said amplifier.
A lineariser as claimed in any of preceding claim, wherein a third variable gain amplifier is provided for adjusting the power level of the input signal.
A lineariser as claimed in any preceding claim, wherein the gain variations adjustment means comprises a field effect transistor (FET).
A lineariser as claimed in any preceding claim, wherein the phase variations adjustment means is provided with a non-linear resistor element.
A lineariser as claimed in any preceding claim, wherein the phase variations adjustment means is provided with capacitor means.
A lineariser as claimed in any preceding claim being implemented as a microwave monolithic integrated circuit.
A lineariser as claimed in any preceding claim, wherein said input signal is a radio frequency signal.
A lineariser as claimed in any preceding claim, wherein said at least variable gain amplifier is adapted to amplify signals.
A lineariser as claimed in any preceding claim, wherein said at least variable gain amplifier is adapted to attenuate signals.
A lineariser as claimed in any preceding claim in combination with an amplifier.
A method of linearising an amplifier, comprising:
Dependencies are inferred from the claim text.