Sampling and hold circuit pdf

Fattaruso, J. Tewksbury, T. Zanchi, A. Abo, A. Dessouky, M. Gumenyuk, A. Yang, W. Lewis, S. Thompson, D. Li, J. Download references. You can also search for this author in PubMed Google Scholar. Correspondence to A. Gumenyuk, Yu. Bocharov, , published in Mikroelektronika, , Vol. Reprints and Permissions.

Russ Microelectron 36, — Phase and gain plots of the amplifier Fig. The sample and hold architecture with bootstrap switches Fig. Schematic of bootstrap switch www. Output Waveforms of Bootstrap Switch [8] H.

Razavi,"Design of sample and hold No. Power 47 16 2. Tadeparthy and Das M. Conclusion We have designed a sample and hold circuit using rail to rail input stage operational amplifier which is more efficient than the previous designs and bootstrap switches have been used in this circuit. The simulation results and comparison results show the enhancement in performance of the sample and hold circuit.

References [1] S. Sakurai and M. Kluwer Academic Publishers, Renirie, K. Analog Integrated Circ. Signal, July , vol. Lim and B. Waltari, "Circuit techniques for low voltage and high speed analog to digital converters," Ph. D thesis, Helsinki University of technology Johns and K. Related Papers. Reliable circuit techniques for low-voltage analog design in deep submicron standard CMOS: A tutorial.

By Mohamad Sawan. Prasant choudhury ec thesis. By Tobie Nathon. Download pdf. Log in with Facebook Log in with Google. Remember me on this computer. Enter the email address you signed up with and we'll email you a reset link.

Need an account? Click here to sign up. Note that all the below mentioned circuits use JFET as the switch. During the sampling period, the JFET is turned ON and the charging in the holding capacitor rises to the level of the input analog voltage. This makes sure that the output voltage is held constant at the value of the input voltage irrespective of minor changes in the input value. To compensate for the low drop-out voltage across the holding capacitor, two buffers voltage followers are used, one at the input and one at the output.

As there is no feedback, this circuit is relatively faster than the coming circuits which all are in closed-loop configuration. But the feedback in the closed-loop architectures provide higher accuracy figures. The acquisition time discussed in the next section must be as low as possible. It is dependent on three factors:. A slightly improved circuit than the first one is presented in the next circuit. In this configuration, the ON Resistance of the JFET is brought into the feedback loop and hence, the acquisition time is dependent on the other two factors.

The next circuit is further improved when compared to the previous circuit by providing voltage gain. The voltage gain of the circuit can be calculated using the input resistor R1 and the feedback resistor RF as follows:.

The final circuit offers additional advantages than the previous circuit. The important one is that the position of the holding capacitor is changed and as a result, the voltage at non-inverting terminal of A 2 is equal to the voltage across the capacitor divided by the open-loop gain of A 2. This ensure a faster charging time of the holding capacitor and subsequently a shorter acquisition time.

These characteristics are helpful in analyzing its performance during the transition from sampling mode to hold mode and vice versa and also during hold mode operations.