| 摘要 |
The invention diminishes the effects of noise in a non-inverting or inverting amplifier circuit by changing the effective input impedance of the amplifier during a switching event, e.g. during operation of an input selector or multiplexer. The effective input impedance is changed either directly by changing the value of components connected to the input or indirectly by altering connections to other elements, such as bootstrap capacitors, that determine the effective input impedance. The indirect method is superior as it uses switches connected to low impedance points so that the low impedances diminish the switching noise. The technique finds application in pad selector circuits for electrical impedance tomography. |
