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以SHC5320为例，介绍器件引脚排列上的考虑可以避免信号耦
消耗积分:3 |
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2009-06-05
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In most sampling systems, the inherent characteristics of the
sample-hold dictate its overall performance. However, one
error source that sample-hold users do have under their
direct control is the external charge injection from the digital
control signal. This is known as charge transfer when measured
in coulombs or as charge offset when measured in
volts. It is often also known as pedestal because of its
manifestation as a step change to the output. The culprit is
generally the parasitic capacitance between the digital control
pin and some sensitive node(s) of the circuit.
sample-hold dictate its overall performance. However, one
error source that sample-hold users do have under their
direct control is the external charge injection from the digital
control signal. This is known as charge transfer when measured
in coulombs or as charge offset when measured in
volts. It is often also known as pedestal because of its
manifestation as a step change to the output. The culprit is
generally the parasitic capacitance between the digital control
pin and some sensitive node(s) of the circuit.
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