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Indian Institute of Technology (IIT) Roorkee 
Time interleaved digital transmitter using multi-level digital quantization 
Karun Rawat and Nishant Kumar 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2018-06-12 
Application Number:
Applied at:
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Indian Institute of Technology (IIT) Roorkee 
It includes digital encoder, level transformer and GHz converter, high efficiency power amplifiers (HEPAs), power combiner and band pass filter. Digital encoder block converts amplitude and phase information of input baseband signal into N-level quantized signal. Due to its N-level structure the quantization noise is reduced significantly. These N-level quantized signals are further transformed to M number of bi-level, time interleaved signals such that M<N/2. Each of these bi-level signals is modulated over RF carrier frequency and being amplified by individual HEPA. The output of each HEPA is then combined using power combiner to retrieve the N-level quantized signal modulated over the RF carrier. This signal is then passed through bandpass filter to remove the unwanted noise and reconstruct the envelope of original baseband data modulated over RF carrier frequency before the transmission. This new architecture minimizes the quantization noise while operating each power amplifier at saturation resulting into highly power and spectral efficient transmission. Moreover, this architecture reduces the number of bi-level signals and hence the number of processing hardware such as quadrature modulator, multiplexers and power amplifiers used to process theses bi-level signals are minimized. This eventually results into small form-factor of the transmitter.  

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