Patent ID: 8674863
Filing Date: 2014-03-18
Classification: H03K

Abstract:
1. A distributed bootstrap input circuit for an analog-to-digital converter (ADC), comprising: a first and second bootstrap circuit, the first bootstrap circuit receiving an input signal for an input sampling network and the second bootstrap circuit receiving the input signal for a flash ADC network, each including at least one first switch for connecting electrical power to a first terminal of at least one capacitor; at least one second switch for connecting a second terminal of the at least one capacitor to a signal to be sampled; at least one third switch for connecting the first terminal of the at least one capacitor to the control gate of at least one sampling network input switch, wherein the third switch is a thick oxide semiconductor switch; at least one fourth switch for connecting the at least one sampling network input switch to a substrate; at least one fifth switch for connecting the second terminal of the at least one capacitor to the substrate, and wherein each bootstrap circuit comprises a negligible parasitic capacitive load and the at least one capacitor and the at least one third switch are configured to provide for a small time constant.