Noise-coupled ΔΣ ADCs

Lee, K.; Bonu, Madhulatha; Temes, Gábor C.

doi:10.1049/el:20062650

Cited by 40 publications

(8 citation statements)

References 3 publications

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“…In [1,2] cross noisecoupled split Σ∆-modulator architectures are presented. In such an architecture, the noise of one loop is injected into the other loop as shown in Fig.…”

Section: Cross Noise-couplingmentioning

confidence: 99%

A 8 mW 72 dB ΣΔ-modulator ADC with 2.4 MHz BW in 130 nm CMOS

Bock

Rombouts

2011

Analog Integr Circ Sig Process

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A double-sampling split Σ∆-ADC with bilinear integrators and a 7-level quantizer is presented. It achieves third order noise shaping with a second order modulator through quantization noise-coupling. The modulator is integrated in a 130 nm CMOS technology. For a clock frequency of 48 MHz and an oversampling ratio of 20 (2.4 MHz signal bandwidth), it achieves 72 dB DR and 68 dB SNR. The prototype consumes 8 mW from a 1.2 V voltage supply.

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“…In [1,2] cross noisecoupled split Σ∆-modulator architectures are presented. In such an architecture, the noise of one loop is injected into the other loop as shown in Fig.…”

Section: Cross Noise-couplingmentioning

confidence: 99%

A 8 mW 72 dB ΣΔ-modulator ADC with 2.4 MHz BW in 130 nm CMOS

Bock

Rombouts

2011

Analog Integr Circ Sig Process

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“…This, however, requires additional hardware for dither generation, and it also reduces the dynamic range (DR) of the modulator. Using noise coupling [66][67][68][69][70], the quantization noise itself is used as dither. Two versions, ring-coupled and self-coupled techniques, were introduced.…”

Section: Project Descriptionmentioning

confidence: 99%

Nanoscale Microelectronic Circuit Development

Ringo¹

2011

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“…Therefore, a complex bandpass ΔΣAD modulator performs AD conversion effectively only for the positive frequency of I, Q input signals in a low-IF receiver, and hence it can be realized with lower power dissipation than a pair of real bandpass ΔΣAD modulators which perform AD conversion for the negative frequency (image signal) as well as the positive frequency. Figure 3 shows a lowpass ΔΣAD modulator with selfcoupled noise injection [7], which is a full feedforward ΔΣAD modulator with an additional error-feedback structure of quantization noise. Notice the error-feedback structure surrounded by dotted line, we see that:…”

Section: X(z)mentioning

confidence: 99%

Cross-Noise-Coupled Architecture of Complex Bandpass .DELTA..SIGMA.AD Modulator

San

Kobayashi

2009

IEICE Trans. Fundamentals

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Complex bandpass ΔΣAD modulators can provide superior performance to a pair of real bandpass ΔΣAD modulators of the same order. They process just input I and Q signals, not image signals, and AD conversion can be realized with low power dissipation, so that they are desirable for such low-IF receiver applications. This paper proposes a new architecture for complex bandpass ΔΣAD modulators with cross-noisecoupled topology, which effectively raises the order of the complex modulator and achieves higher SQNDR (Signal to Quantization Noise and Distortion Ratio) with low power dissipation. By providing the cross-coupled quantization noise injection to internal I and Q paths, noise coupling between two quantizers can be realized in complex form, which enhances the order of noise shaping in complex domain, and provides a higher-order NTF using a lower-order loop filter in the complex ΔΣAD modulator. Proposed higher-order modulator can be realized just by adding some passive capacitors and switches, the additional integrator circuit composed of an operational amplifier is not necessary, and the performance of the complex modulator can be effectively raised without more power dissipation. We have performed simulation with MATLAB to verify the effectiveness of the proposed architecture. The simulation results show that the proposed architecture can achieve the realization of higher-order enhancement, and improve SQNDR of the complex bandpass ΔΣAD modulator.

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Noise-coupled ΔΣ ADCs

Cited by 40 publications

References 3 publications

A 8 mW 72 dB ΣΔ-modulator ADC with 2.4 MHz BW in 130 nm CMOS

A 8 mW 72 dB ΣΔ-modulator ADC with 2.4 MHz BW in 130 nm CMOS

Nanoscale Microelectronic Circuit Development

Cross-Noise-Coupled Architecture of Complex Bandpass .DELTA..SIGMA.AD Modulator

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