Multi-standard peak canceling circuitry

摘要

Integrated circuits with wireless communications circuitry having peak cancelation circuitry operable to perform crest factor reduction is provided. The peak cancelation circuitry may receive at least first and second carrier waveforms and may include at least a first canceling pulse generator (CPG), a second CPG, a first peak detector for performing peak detection on the first waveform, a second peak detector for performing peak detection on the second waveform, a third peak detector for performing peak detection on a combined waveform of the first and second waveforms, and a pulse allocator that receives clipping information from the three peak detectors and that controls the amount of peak cancelation that is being performed by the two CPGs. The allocator may determine whether the combined waveform contains any peaks. In response to determining that the combined waveform does not contain any peaks, the CPGs may be configured in bypass mode.

主权项

1. Circuitry, comprising:
a first input that receives a first carrier waveform; a second input that receives a second carrier waveform; a first circuit that receives the first carrier waveform; a second circuit that receives the second carrier waveform, wherein the first and second circuits perform peak cancelation operations on the first and second waveforms in a first mode and bypasses the peak cancellation operations in a second mode, and wherein the first and second circuits generate corresponding waveforms in the first and second modes; a summing circuit that receives the first and second carrier waveforms from the first and second inputs, respectively, and that outputs a combined waveform; and a peak detection circuit that receives the combined waveform from the summing circuit and that outputs values indicative of the mode in which the first and second circuits operate.