Power Consumption Reduction in High-Speed ΣDelta Bandpass Modulators
نویسندگان
چکیده
Power consumption is a key point in the design of high-speed switched capacitor (SC) circuits, which allow to efficiently implement a number of analog functions. Among them, SC Σ∆ modulators are very popular for A/D conversion: in this kind of circuits, operational amplifiers are the most consuming cells because of their requirements in terms of DC gain and unitygain frequency. A new amplifier with 110dB DC gain and a unity-gain frequency of 250MHz is presented. The large power consumption (20mW) makes critical its use in commercial applications: however, combining this cell with a fast adaptive biasing circuit, high performance may be achieved with a reasonable dissipation. This approach has been used in the design of a 6th-order bandpass Σ∆ modulator featuring 73dB DR and suitable for the conversion at IF (10.7MHz) of the FM radio signal.
منابع مشابه
Reducing the Power Consumption in High-Speed Bandpass Modulators
Power consumption is a key point in the design of high-speed switched capacitor (SC) circuits, which efficiently implement a number of analog functions. Among them, SC modulators are very popular for analog-to-digital conversion. In this kind of circuit, operational amplifiers are the most consuming cells because of their requirements in terms of dc-gain and unity-gain frequency. An operational...
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