An improved bridge track-and-hold circuit

The classic track-and-hold (T&H) circuits based on a diode-bridge feature known drawbacks: low-input impedance, limited slew-rate (SR) and input voltage swing, high-power consumption. To overcome those problems in this paper is proposed and analyzed a new T&H architecture. Tic diodes of the...

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Bibliographic Details
Main Authors: Manolov, E.D., Popov, A.N., Tchamov, N.T.
Format: Conference Proceeding
Language:English
Subjects:
Bandwidth
Bridge circuits
Circuit simulation
Diodes
Energy consumption
Frequency
Impedance
Switches
Telecommunication switching
Voltage
Online Access:Request full text
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Summary:The classic track-and-hold (T&H) circuits based on a diode-bridge feature known drawbacks: low-input impedance, limited slew-rate (SR) and input voltage swing, high-power consumption. To overcome those problems in this paper is proposed and analyzed a new T&H architecture. Tic diodes of the classic diode-bridge are replaced by transistors connected as emitter followers. Two buffers of unity-gain split up the bootstrap loop. PSPICE simulations with real transistor parameters demonstrate the advantages of the new circuit. The T&H waveforms of 5 MHz and 35 MHz input 2 V swing signal, sampled at 80 MHz, are shown. The results of slew-rate higher than 1400 V//spl mu/S, and power saving of above 10-20 times, compared with the conventional circuit, are obtained.
DOI:10.1109/MIEL.2002.1003348