System for and method of reducing transmit signal distortion
AssigneeBroadcom Corporation
InventorsLoke K. Tan, Takayuki Hayashi, Lin He, Giuseppe Cusmai, Chun-ying Chen
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Abstract
Systems and methods relate to providing a transmit signal. The transmit signal can be provided in a transmitter circuit including a main pre-equalizer, a main power amplifier in communication with the main pre-equalizer, a replica pre-equalizer, and a replica power amplifier in communication with the replica pre-equalizer. The replica preamplifier is in communication with the main pre-equalizer, and control signals are provided to the main pre-equalizer to reduce distortion. The control signals are provided in response to an output signal of the replica power amplifier.
Claims20
A transmitter circuit, comprising:
- a main pre-equalizer;
- a main power amplifier in communication with the main pre-equalizer;
- a replica pre-equalizer;
- and
- a replica power amplifier, the replica power amplifier being in communication with the replica pre-equalizer, wherein control signals are provided to the main pre-equalizer to reduce distortion, the control signals being provided in response to an output signal of the replica power amplifier.
A method of amplifying a transmit signal, the method comprising:
- pre-distorting a training signal;
- amplifying the training signal in a first amplifier;
- using an output signal from the first amplifier to provide a control signal;
- pre-distorting the transmit signal in accordance with the control signal;
- and
- amplifying the transmit signal in a second amplifier, the first amplifier having the same or similar configuration to the second amplifier.
A modem, comprising:
- a main pre-distortion circuit configured to pre-distort a transmit signal according to a set of coefficients or a version of the set of the coefficients and provide a first pre-distorted signal;
- a main power amplifier configured to amplify the first pre-distorted signal;
- a replica pre-distortion circuit configured to pre-distort a training signal according the set of coefficients;
- a replica power amplifier configured to amplify the second pre-distorted signal and provide an amplified signal;
- and
- a coefficient computing circuit configured to receive the amplified signal or a version of the amplified signal and provide the set of coefficients.
Dependencies are inferred from the claim text.