Amplifiers – With amplifier condition indicating or testing means
Patent
1993-11-15
1995-01-10
Mottola, Steven
Amplifiers
With amplifier condition indicating or testing means
330107, H03F 134
Patent
active
053811089
ABSTRACT:
A Cartesian amplifier in which an input signal is pre-processed and split into two quadrature components. Both quadrature components are passed, in parallel, through an error amplifier (4), after which they are re-combined and up-converted to RF. The output of the amplifier is used to provide a feedback signal. This feedback is downconverted from RF to baseband and resolved into two quadrature components which are fed to the respective inputs of the error amplifier (4). Periodically the pre-processor (3) is switched into a calibration mode in which test signals are applied to the amplifier instead of the input signal. At these times the signal strength of the output of the power amplifier is measured and used to provide pre-distortion factors in the signal preprocessor (3) to improve amplifier linearity.
REFERENCES:
patent: 5049832 (1991-09-01), Cavers
patent: 5066923 (1991-11-01), Gailus et al.
patent: 5105446 (1992-04-01), Ravoalavoson et al.
A. Bateman, R. J. Wilkinson and J. D. Marvill: The Application Of Digital Signal Processing To Transmitter Linearisation, dated 1988, 4 pages.
Parry Ian S.
Whitmarsh William J.
Whittle Simon M.
Linear Modulation Technology Limited
Mottola Steven
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