Quantization Noise Cancellation of Fractional-N Frequency Synthesizers Using Pre-distortion Technique

Quantization Noise Cancellation of Fractional-N Frequency Synthesizers Using Pre-distortion Technique

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This work proposes a novel pre-distortion technique for the quantization noise cancellation of fractional-N frequency synthesizers.The proposed technique utilizes the coordinate rotation digital computer (CORDIC) algorithm to pre-distort the baseband signal of a wireless system with the quantization noise.The pre-distorted signal then modulates the noisy output signal of the fractional-N frequency synthesizer.

The transmitter (Tx) Digital Mixers modulation quality is thereby improved.In the receiver (Rx) mode, the phase noise of the Rx copyright signal can also be improved by modulation with a pre-distorted sinusoidal signal rather than a baseband signal.Experimental results demonstrate that the novel pre-distortion technique effectively improves the modulation quality of a Tx by an error vector magnitude (EVM) of about 10 % under DEODORANT CURATOR a 13 Mbps QPSK modulation.

The copyright in-band and out-band phase noise of the fractional-N frequency synthesizer is improved by approximately 6 dB and 10 dB, respectively.