Multilevel LINC transmitter
A multilevel LINC transmitter. The multilevel LINC transmitter comprises a multilevel signal component separator, a phase modulator block, and an RF block. The multilevel signal component separator comprises a multilevel scaler and converts a base band signal to constant envelope signals. The phase modulator block is coupled to the multilevel signal component separator. The RF block comprises a plurality of power amplifiers coupled to the phase modulator block and the multilevel scaler and a power combiner coupled to the power amplifiers.
1. A multilevel LINC transmitter, comprising:
a multilevel signal component separator comprising a multilevel scaler and converting an input signal to phase signals;
a phase modulator block coupled to the multilevel signal component separator; and
an RF block comprising a plurality of power amplifiers coupled to the phase modulator block and the multilevel scaler and a power combiner coupled to the power amplifiers.
2. The multilevel LINC transmitter as claimed in claim 1 , wherein the multilevel scaler comprises an slicer and a ROM coupled to the slicer.
3. The multilevel LINC transmitter as claimed in claim 2 , wherein the slicer comprises a comparator.
4. The multilevel LINC transmitter as claimed in claim 1 , further comprising an envelope modulator coupled to the multilevel scaler and the power amplifiers.
5. The multilevel LINC transmitter as claimed in claim 4 , wherein the envelope modulator comprises a digital to analog converter (DAC) coupled to the multilevel scaler and a low pass filter (LPF) coupled between the DAC and the power amplifiers.
6. The multilevel LINC transmitter as claimed in claim 5 , wherein the envelope modulator further comprises a low drop-out (LDO) regulator coupled between the LPF and the power amplifier.
7. The multilevel LINC transmitter as claimed in claim 6 , further comprising a delay compensator coupled between the phase modulator block and the RF block.
8. The multilevel LINC transmitter as claimed in claim 4 , further comprising a distortion compensator coupled between the multilevel signal component separator and the envelope modulator.
9. The multilevel LINC transmitter as claimed in claim 8 , further comprising a sensor coupled to the distortion compensator.
10. The multilevel LINC transmitter as claimed in claim 1 , wherein the power combiner is a Wilkinson combiner.