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2007
IEEE

Blue-Noise Sigma-Delta Modulator: Improving Substrate Noise and Nonlinear Amplifier Gain Effects

9 years 5 months ago
Blue-Noise Sigma-Delta Modulator: Improving Substrate Noise and Nonlinear Amplifier Gain Effects
— This paper presents a method to reduce the effects of substrate noise and nonlinear amplifier gain on sigma-delta (Σ∆) modulators through the use of blue-noise modulation. In addition to reducing the effects of substrate noise and nonlinear amplifier gain, the proposed architecture also suppresses the effects of integrator opamp non-idealities, such as 1/f noise and DC offset, and DAC DC offset and even-order nonlinearities. The architecture proposed herein is referred to as the blue-noise Σ∆ modulator. An example utilizing a thirdorder blue-noise Σ∆ modulator with a 1-bit quantizer is presented. Additionally, a method to generate the required blue-noise modulation sequence is proposed. Simulation results demonstrate that this architecture achieves an 8.8dB improvement in SNR over the traditional third-order Σ∆ modulator.
Eric C. Moule, Zeljko Ignjatovic
Added 04 Jun 2010
Updated 04 Jun 2010
Type Conference
Year 2007
Where ISCAS
Authors Eric C. Moule, Zeljko Ignjatovic
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