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Sigma-delta modulator is famous for its inherent linearity, reduced anti-aliasing filter complexity and high tolerance to circuit imperfection. Band-pass sigma-delta converter is better for narrow-band signals in high-speed, high signal-to-noise ratio and high resolution system compared with ordinary architecture. Both type of converters have been applied in various architectures including quadrature architecture, two-path architecture and parallelism technique depending on the applications. This paper proposes a bandpass sigma-delta modulator for mixed-signal to achieve higher SNR and resolution at lower power consumption using VLSI technology.