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 2000 bmw 528i front bumper output signal of the fractional-N frequency synthesizer.The transmitter (Tx) modulation quality is thereby improved.In the receiver (Rx) mode, the phase noise of the ngetikin 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 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.