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Sample-and-Hold Amplifiers

The purpose of the sample-and-hold amplifier is to freeze an analog voltage at the instant the HOLD command is issued and make that analog voltage available for an extended period. Figure 8.1 shows various ways of converting three analog input signals to digital signals for acquisition by a single digital n-bit bus.

Figure 8.1:  Three schemes for multiplexing several analog signals down to one digital input path. The notation S/H indicates sample-and-hold, ADC means analog-to-digital converter, MUX means multiplexer, and the symbol across a line indicates n digital signals.

Doug Gingrich
Tue Jul 13 16:55:15 EDT 1999