This paper proposes hybrid architecture of feedforward/feedback second order single-loop modulator for high resolution analog-to-digital converter (ADC) applications. Different techniques for oversampling modulator are discussed. The proposed architecture consists of three stages. The first stage is nd 2 order single loop oversampling ADC with novel feedforward/feedback architecture. In the second stage, an error cancellation circuit (ECC) is proposed at the output of the modulator to noise shaping of quantization noise. In addition, the third stage is a decimation filter in order to reduce the oversampling ratio (OSR) which is suitable for broadband applications. With low OSR=24, the signal-to-noise ratio (SNR) is improved about 55 dB if compared with traditional architecture (feedback singleloop high order topology). The achieved resolution or the effective number of bits (ENOB) is (22-bit). With high OSR=256, the net improvement in quantization noise reduction is 64 dB if compared with feedforward architecture (single-loop high order) and the ENOB=28. Finally a 1-bit quantizer is used in the proposed architecture which greatly decreases the circuit implementation complexity and power consumption. Simulation results show the superiority performance of proposed hybrid architecture as compared with traditional modulator topologies (feedforward and feedback).
A first order of DWA (Data Weighted Averaging) algorithm with third order sigma-delta modulator is proposed for application in sigma-delta fractional-N frequency synthesizer for WiMAX. In addition, this paper discusses the impact of mismatch between Digital-to-Analog convertor (DAC) unit elements. The simulation results show the effectiveness of the DWA technique in reduction of spurs, also DWA technique proves its ability to solve DAC unit elements mismatch. The fractional spur noise is converted into a broadband. Quantization noise with DWA is improved by -10 dB if the element mismatch 0.01 and -5 dB if the element mismatch 0.08 with 8 bit PFD/DAC. Matlab (V.7) program is used for simulation.
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