Patent ID: 7755398
Filing Date: 2010-07-13
Classification: H03H,H03K

Abstract:
1. A time constant calibration device, comprising: a first voltage generating circuit, utilizing a first current passing through a first capacitive component to generate a first voltage; a second voltage generating circuit, utilizing a second current passing through a resistive component to generate a second voltage; and a comparing circuit electrically coupled to both the first voltage generating circuit and the second voltage generating circuit for comparing the first voltage with the second voltage to generate a comparing signal, wherein the first voltage generating circuit comprises an analog adjusting component for adjusting the first voltage according to the comparing signal until the first voltage is equal to the second voltage, whereby a time constant defined by an equivalent capacitance corresponding to the first current passing through the capacitive component and an equivalent impedance corresponding to the second current passing through the resistive component reaches a predetermined value.