Precharge switch-capacitor circuit and method
AssigneeTexas Instruments Incorporated
InventorPaul Stulik
Life of this patent
Estimating the term…
Abstract
An input sampling stage circuit includes, a precharge buffer, a precharge switch-capacitor circuit, and an input sampling capacitor. The precharge buffer is configured to buffer an input voltage. The precharge switch-capacitor circuit includes a plurality of switches, a first capacitor, and a second capacitor configured such that the first and second capacitors are connected in series during a coarse sampling time and in parallel during a fine sampling time and charge transfer time. The input sampling capacitor is configured to sample the input voltage through the precharge switch-capacitor circuit during the coarse sampling time and sample the input voltage directly during the fine sampling time.
Claims19
A switch-capacitor circuit, comprising:
- an input sampling stage circuit that includes:
- a precharge buffer configured to buffer an input voltage;
- a precharge switch-capacitor circuit including a plurality of switches, a first capacitor, and a second capacitor configured such that the first and second capacitors are connected in series during a coarse sampling time and in parallel during a fine sampling time and charge transfer time;
- and
- a first input sampling capacitor configured to sample the input voltage through the precharge switch-capacitor circuit during the coarse sampling time and sample the input voltage directly during the fine sampling time;
- and
- an output stage circuit.
A switch-capacitor circuit, comprising:
- an input sampling stage circuit that includes:
- a precharge buffer configured to buffer an input voltage;
- a precharge switch-capacitor circuit including a plurality of switches, a first capacitor, and a second capacitor configured such that the first and second capacitors are connected in parallel during a first portion of a coarse sampling time, in series during a second portion of the coarse sampling time, and in parallel during a fine sampling time and charge transfer time;
- and
- a first input sampling capacitor configured to sample the input voltage through the precharge switch-capacitor circuit during the coarse sampling time and sample the input voltage directly during the fine sampling time;
- and
- an output stage circuit.
An input sampling stage circuit, comprising:
- a precharge buffer configured to buffer an input voltage and settle during a fine sampling time and a charge transfer time;
- and
- a precharge switch-capacitor circuit including a plurality of switches, a first capacitor, and a second capacitor configured such that an input sampling capacitor samples the input voltage through the precharge switch-capacitor circuit during a coarse sampling time, samples the input voltage directly during the fine sample time, and discharges stored charge to an output stage circuit during the charge transfer time;
- wherein the plurality of switches, the first capacitor, and the second capacitor configured such that the first and second capacitors are connected in parallel during a first portion of a coarse sampling time, in series during a second portion of the coarse sampling time, and in parallel during a fine sampling time.
Dependencies are inferred from the claim text.