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The mismatch and parasitics of layout and process in pipelined ADCs are analyzed in this paper and an optimized system has been implemented. Based on the model establishment of the proposed ADC, the offset of input in each stage and the fluctuation of reference voltage, which degrades the effective resolution of pipelined ADCs, caused by transistors mismatches and parasitic effects are modeled and...
The start-up conditions for differential oscillator with an even number of stages are analyzed in this paper. Compared with those that have an odd number of stages, such oscillators may have two stable equilibrium states besides an astable equilibrium state in which the circuits can start to oscillate. To avoid the risk of possible latching up into the stable states, an additional start-up circuit...
This paper presents a high gain and wide bandwidth fully differential operational amplifier (op amp) used in a sample and hold amplifier (SHA) circuit for a 12bit, 50Ms/s pipelined ADC. The gain-boosted technique is adopted to achieve a high gain without reduction of the output swing, while a new frequency compensation method is developed to compensate the bandwidth degradation caused by the gain-boosted...
This paper presents a closed-loop switched-capacitor interface for high-quality bulk micro-mechanical accelerometer. Analogue force feedback is realized to establish an electro mechanical closed-loop so as to improve the dynamic range. The feedback accuracy is guaranteed by applying bottom-plate sampling structure in the feedback controller. A proportional derivative controller is introduced to compensate...
A low power continuous phase-switching multi-modulus prescaler is proposed, based on a so called "time borrowing" method. This novel phase-switching control strategy significantly reduces the delay of the phase-switching control loop so the multi-modulus prescaler can work with higher input frequencies and obtain the maximum modulus for a lower power supply. According to the measurement...
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