Charge sampling filter circuit and charge sampling method
AssigneeSony Corporation
InventorsAtsushi Yoshizawa, Sachio Iida
Life of this patent
Estimating the term…
Abstract
To provide a charge sampling filter circuit and a charge sampling method. A charge sampling filter circuit includes a first capacitor that samples an input signal, and in which at least a portion of electric charge stored in the first capacitor by sampling is output to a second capacitor that is connectable with the first capacitor. The charge sampling filter circuit is characterized by including a switching portion that switches a circuit mode including a sampling mode that causes the first capacitor to sample the input signal, and an output mode that causes the first capacitor and the second capacitor to be connected. A capacitance value of the first capacitor in the output mode is set to be lower than the capacitance value in the sampling mode.
Claims13
A charge sampling filter circuit which includes a first capacitor that samples an input signal, and in which at least a portion of electric charge stored in the first capacitor by sampling is output to a second capacitor that is connectable with the first capacitor, the charge sampling filter circuit including:
- a switching portion that switches a circuit mode including a sampling mode that causes the first capacitor to sample the input signal, and an output mode that causes the first capacitor and the second capacitor to be connected, wherein
- a capacitance value of the first capacitor when the circuit mode is the output mode is set to be lower than the capacitance value of the first capacitor when the circuit mode is the sampling mode, and
- when the first capacitor operates in one of the circuit modes, the first capacitor can be selectively operated to have a variable capacitance that varies the capacitance value, or to have a fixed capacitance.
A charge sampling filter circuit comprising:
- a unit capacitor group including at least two or more capacitors, and
- a switching portion that switches a circuit mode of the unit capacitor group that includes a sampling mode and an output mode, wherein
- when the circuit mode of the unit capacitor group is switched to the sampling mode by the switching portion, a plurality of capacitors included in the unit capacitor group perform sampling, and
- when the circuit mode of the unit capacitor group is switched to the output mode by the switching portion, only one of the capacitors among the plurality of capacitors outputs electric charge stored by the sampling.
A charge sampling method, comprising:
- a switching step that switches between a sampling step of sampling an input signal by a first capacitor, and an output step of outputting at least a portion of electric charge stored in the first capacitor by the sampling to a second capacitor that is connected to the first capacitor;
- a step of reducing a capacitance value of the first capacitor in the output step to be lower than the capacitance value of the first capacitor in the sampling step;
- a step of selectively operating the first capacitor to have a variable capacitance that varies the capacitance value or to have a fixed capacitance, when the first capacitor operates in the sample step or in the output step;
- and
- a discharge step of discharging electric charge stored in the first capacitor.
Dependencies are inferred from the claim text.