Improvement of Bootstrapped Switch using Track and Precharge Phase

This paper discusses the input range limitation problems in track-and-hold circuit and the compensation method using a bootstrapped switch. A bootstrapped switch with an additional control circuit is proposed to compensate charge loss in conventional bootstrapped switch circuit. Simulation results using 0.18 mum CMOS process parameters show that the proposed circuit reduces the bootstrap capacitance down to 25% for the conventional circuit.

[1]  Chenming Hu,et al.  Switch-induced error voltage on a switched capacitor , 1984 .

[2]  Mohamad Sawan,et al.  Low-voltage CMOS analog bootstrapped switch for sample-and-hold circuit: design and chip characterization , 2005, 2005 IEEE International Symposium on Circuits and Systems.

[3]  Chi-Chang Lu,et al.  A 1.5-V 50-MHz pseudodifferential CMOS sample-and-hold circuit with low hold pedestal , 2005, IEEE Transactions on Circuits and Systems I: Regular Papers.

[4]  T. Ytterdal,et al.  Bootstrapped switch in low-voltage digital 90nm CMOS technology , 2005, 2005 NORCHIP.

[5]  M. Sawan,et al.  Low-voltage CMOS analog switch for high precision sample-and-hold circuit , 2000, Proceedings of the 43rd IEEE Midwest Symposium on Circuits and Systems (Cat.No.CH37144).

[6]  Franco Maloberti,et al.  A bootstrapped switch for precise sampling of inputs with signal range beyond supply voltage , 2005, Proceedings of the IEEE 2005 Custom Integrated Circuits Conference, 2005..

[7]  A. Boni,et al.  100-MS/s 14-b track-and-hold amplifier in 0.18-/spl mu/m CMOS , 2005, Proceedings of the 31st European Solid-State Circuits Conference, 2005. ESSCIRC 2005..

[8]  M. del Mar Hershenson.  CMOS analog circuit design via geometric programming , 1999 .