Patent ID: 6028459
Filing Date: 2000-02-22
Classification: G11C

Abstract:
An apparatus including a track-and-hold circuit, the track-and-hold circuit comprising:an input circuit for conveying an input signal;a capacitor circuit for storing a voltage representative of the input signal;a differential amplifier circuit configured to receive a track signal and in accordance therewith generate a first control signal, and configured to receive a hold signal and in accordance therewith generate a second control signal;a switching circuit coupled between the input circuit and the capacitor circuit and coupled to the differential amplifier circuit and configured to receive the first and second control signals and in accordance therewith close and open;a clamping circuit coupled to the switching circuit and the differential amplifier circuit, wherein the clamping circuit receives the second control signal and in accordance therewith clamps the voltage on the switching circuit to isolate the input signal from the voltage representative of the input signal stored on the capacitor circuit; andan output circuit coupled to the capacitor circuit and configured to receive a voltage appearing across the capacitor and in accordance therewith generate an output signal,wherein the output circuit comprises an output buffer circuit and a level shifter, such that the stored voltage appearing across the capacitor circuit is substantially equal to a voltage level of the input signal.