System and method for reducing dynamic range and improving linearity in an amplication system
View Patent ↗An amplification system and method is provided that reduces peaks associated with an input signal, and provides correction, in one or more spectral bands, to signal distortion and out-of-band emissions that result from the peak reduction. The correction signal that removes signal distortion and OOB emissions associated with the peak reduction can be calculated or electronically derived. The correction signal can be combined with the peak reduced signal prior to or after amplification of the peak reduced input signal.
1. An amplification system comprising:
a channelizer that separates an input signal into a plurality of sub-bands;
a plurality of modification components that modify at least one of gain, phase and offset associated with a corresponding sub-band of the plurality of sub-bands to mitigate distortion and OOB emissions associated with the sub-band; and
an aggregator that recombines the plurality of sub-bands into an aggregated signal.
2. The system of claim 1 , further comprising a peak reduction component that reduces peaks associated with an input signal to provide a peak reduced input signal.
3. The system of claim 1 , further comprising a digital-to-analog converter (DAC) that converts the aggregated signal from the digital domain to the analog domain to provide an analog aggregated signal and a power amplifier that amplifies the analog aggregated signal.
4. The system of claim 1 , further comprising a plurality of digital-to-analog converters (DACs) that converts the plurality of sub-band signals from the digital domain to the analog domain prior to recombining the plurality of sub-bands into an aggregated signal and a power amplifier that amplifies the aggregates signal.
5. A method of amplifying an input signal comprising:
removing peaks associated with an input signal to provide a peak reduced input signal;
separating at least one of a wanted signal, the peak reduced input signal, adjacent spectral channels, and nearby spectral bands into a plurality of sub-band signals;
modifying at least one of gain, phase and offset of the at least one sub-band of the plurality of sub-bands to mitigate signal distortion and out-of-band (OOB) emissions;
aggregating the plurality of sub-bands to provide an aggregated input signal; and
amplifying the aggregated input signal to provide a final amplified output signal.
6. The method of claim 5 , further comprising converting the aggregated signal from the digital domain to the analog domain prior to amplifying.
7. The method of claim 5 , further comprising converting the plurality of sub-bands from the digital domain to the analog domain prior to aggregation.