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This paper presents a double-sampling switched-capacitor (SC) tunable resonator for bandpass (BP) DeltaSigma modulators. The resonator is implemented with a single opamp to reduce the power consumption. In addition, the resonant frequency can be easily tuned by controlling the number of shunting capacitors. Based on the resonator, a fourth-order BP DeltaSigma modulator is proposed. With the tuning...
A fourth-order low-pass continuous-time filter for a UMTS/WLAN receiver of a reconfigurable terminal is presented. The filter uses the cascade of two Active-Gm-RC biquad cells. A single opamp is used for each biquad and its unity-gain-bandwidth is comparable to the filter cut-off frequency. Thus, the opamp power consumption is strongly reduced w.r.t. other closed-loop filter configurations. The cut-off...
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