Super-linear multi-carrier power amplifier
AssigneeWiseband Communications Ltd.
InventorsYuval Shalom, Danny Arison, Kalman Kaufman
Life of this patent
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Abstract
A super-linear feedforward amplifier, for amplifying radio-frequency input signals produced in one or more frequency channels over an input band, includes a radio-frequency power amplifier, which amplifies the signals. A signal cancellation circuit loop generates an error signal responsive to distortion products in the amplified signals. A digital correction block digitally equalizes the input signals responsive to a transfer function of the amplifier, whereby the input signals are substantially canceled out of the error signal over the entire input band. An error cancellation circuit loop subtracts the error signal from the amplified signals to generate a linearized output signal.
Claims35
A super-linear feedforward amplifier, for amplifying radio-frequency input signals produced in one or more frequency channels over an input band, comprising:
- a radio-frequency power amplifier, which amplifies the signals;
- a signal cancellation circuit loop, which generates an error signal responsive to distortion products in the amplified signals;
- a digital correction block, which digitally equalizes a digitized version of the input signals responsive to a transfer function of the amplifier, whereby the input signals are substantially canceled out of the error signal over the entire input band;
- and
- an error cancellation circuit loop, which subtracts the error signal from the amplified signals to generate a linearized output signal.
A super-linear feedforward amplifier, for amplifying radio-frequency input signals produced in one or more frequency channels over an input band, comprising:
- a radio-frequency power amplifier, which amplifies the signals;
- a signal cancellation circuit loop, which generates an error signal responsive to distortion products in the amplified signals;
- a time-domain correction block, which processes successive sample of the input signals in the time domain, responsive to a transfer function of the amplifier, such that the input signals are substantially canceled out of the error signal over the entire input band;
- and
- an error cancellation circuit loop, which subtracts the error signal from the amplified signals to generate a linearized output signal.
A method for feedforward amplification of radio frequency signals input from one or more predefined frequency channels over an input band, comprising:
- providing a power amplifier and associated circuitry having an amplitude and phase transfer function;
- determining a characteristic of the transfer function of the amplifier and the associated circuitry;
- digitizing the input signals to generate a stream of digital samples;
- processing the digital samples to equalize the signals responsive to the characteristic;
- converting the equalized signals to analog form;
- amplifying the signals using the amplifier;
- generating an error signal responsive to distortion in the equalized and amplified signals;
- and
- subtracting the error signal from the amplified signals to generate a linearized output signal in which the distortion is reduced.
A method according to claim. 27, wherein calculating the correlation comprises deriving a signal parameter from the feedback signals and, responsive to a substantial change in the parameter, determining a new estimate of the correlation vector instead of iteratively updating the initial estimate.
Dependencies are inferred from the claim text.