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This paper proposes a charge-domain quadrature down-conversion sampling mixer with improved filter functionality. An 4-path bandpass filter and a quadrature sampling mixer are integrated in a cascode architecture to minimize power consumption while providing a degree of programmability. The proposed design is applicable to heterodyne receivers for suppressing aliasing signals, large out-of-band blockers,...
This paper presents a circuit architecture for digitizing the VCO phase in a digital phase locked loop. The proposed architecture functions as a ΔΣ modulator in the phase domain to achieve noise shaping, and uses a Digital-To-Time Converter to achieve a fractional phase quantization step. The combination of the ΔΣ noise shaping and fractional quantization reduces quantization phase noise both in-band...
By manipulating digital tools to include a single analog cell, the complete DAC and IF transmit path of a radio is automatically placed and routed in 0.12 mm2. Implemented in 0.18 mum CMOS, an over-sampled SigmaDelta modulator quantizes the data stream and a semi-analog filter selects a replica of the desired signal at IF. Based on instances of a 5-transistor analog cell, an integrated mixed-signal...
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