Transcription of CMOS COMPARATOR 1. Comparator Design …
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CMOS COMPARATOR 1. Comparator Design …
cmos COMPARATOR 1. COMPARATOR Design Specifications Vo(Vin+ - Vin-)VOHVOL(Vin+ - Vin-)VOHVOLVIHVIL(Vin+ - Vin-)VOHVOLVIHVILVOS(b)(c)(a) Figure 1. COMPARATOR Transfer Characteristics. A COMPARATOR is a circuit that has binary output. Ideally its output shown in Figure 1(a) is defined as follows: 1 < > =++0VV if V0VV if VV-inin OL-ininOHO This is not realizable because its gain is infinity. Figure 1(b) shows a realizable first order transfer characteristic of a COMPARATOR . Its output is defined as follows: <<<>=++++IL-ininOLIH-ininIL-ininVIH-ininOHOV )V-(V if VV)V-(VV if )V-V(A V)V-(V if VV Another nonideal characteristic of practical COMPARATOR is the present of input offset. That is the output does not change until the input difference reached the input offset Vos.
A longer settling time implies that the rate of processing analog signals must be reduced. In the following design, a 10mV signal must be resolved using the comparator in …
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