Abstract
The proposed time-interleaved (TI) band-pass sigma-delta modulator (BPSDM) simultaneously provides two channel analog-to-digital conversions with sharing operational transconductance amplifiers (OTA) for in-phase/quadrature-phase (I/Q) channels of a digital intermediate frequency (IF) system. The architecture leads to reduced silicon area and power consumption while suppressing the effects of I/Q channel mismatches. The proposed TI BPSDM block in I/Q channels was designed and simulated for a 30-MHz IF system with a 0.35-μm CMOS process. The simulated peak signal-to-noise-plus-distortion ratio (SNDR) for a 1.25-MHz bandwidth in each I/Q channels is approximately 61.2 dB with mismatches while dissipating 70 mW from a 3.3-V supply and occupying 1.78 mm2.
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