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A wide-bandwidth low-power CT ΔΣ modulator with 10MHz signal bandwidth is implemented in TSMC 0.18 μm CMOS process in this paper. To realize such application scenario, the proposed modulator comprises a third-order active-RC loop filter and a 4-bit internal quantizer operating at 320 MHz clock frequency. To reduced clock jitter sensitivity, non-return-to-zero (NRZ) DAC pulse shaping is used. The excess...
This paper presents the design of a third-order continuous-time (CT) single-bit active-RC sigma-delta (SigmaDelta) modulator for Bluetooth application. Through the use of the architecture, cascade of resonators with distributed feedback (CRFB), the signal bandwidth can be improved without increasing the order of the modulator. All integrators are implemented by active-RC type to have better linearity...
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