| 摘要 |
<p>An integrated circuit capacitive transducer (10) measures at least one parameter of a medium to which it is exposed. A variable capacitor (12) has a capacitance (C1) which varies as a function of the measured parameter and is charged by source of reference potential (Vr). The charge on the variable capacitor (12) is then transferred to a second capacitor (14) having a fixed reference capacitance (Cr). The voltage (V1) developed across the second capacitor (14) by the charge transferred thereto is then a function of the capacitance (Vr) of the first capacitor (12). Therefore, the voltage (V1) is also a function of the parameter being measured. The capacitive transducer may also include a further variable capacitor (32, 34) for measuring the difference of parameters between two mediums.</p> |
