| 摘要 |
<p>A sampling circuit which is capable of a full ranging output when powered with very low voltage supplies, e.g., of about 1 volt, includes a current copier function added to a sample and hold circuit to avoid the need for low threshold switching devices in the sampling circuit, thus avoiding output droop due to the increased leakage of low threshold devices. A pre-charge circuit (100) is placed between the sample and hold circuit (0A3, M1,CH) and a current storage transistor (M3) to 'boost' the voltage level of the output of the sample and hold circuit above the threshold voltage of the current storage transistor. The pre-charge circuit includes an output voltage boost capacitor (CS) which is charged before the hold cycle of the sampling circuit. The level of the voltage charged onto the output voltage boost capacitor is based on the threshold voltage of the current storage transistor. <IMAGE></p> |
