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US 8,786,360 B2Granted
Circuit and method for fast switching of a current mirror with large MOSFET size
AssigneeSTMicroelectronics Asia Pacific Pte Ltd
InventorJustin Ang
Life of this patent
Estimating the term…
Abstract
The present invention discloses a fast switching current mirror circuit and method for generating fast switching current. The circuit and method for fast switching of a current mirror with large MOSFET size will save space and current consumption.
Claims13
A circuit for providing a switched current comprising:
- a first current mirror having a power terminal coupled to a source of supply voltage, an input, and an output;
- a second current mirror having an input for receiving an input current, a first output coupled to the output of the first current mirror, a second output coupled to the input of the first current mirror, and a power terminal coupled to ground;
- a draining module having an input coupled to the output of the first current mirror, a first output coupled to the input of the first current mirror, and a second output coupled to ground;
- and
- an MOS output transistor having a gate coupled to the input of the first current mirror through a first switch and coupled to the source of supply voltage through a second switch, a first current terminal coupled to the source of supply voltage, and a second current terminal for providing the switched current.
2 more elements
A circuit for providing a switched current comprising:
- a first current mirror;
- a second current mirror for receiving an input current having first and second outputs coupled to the first current mirror;
- an inverter having an input coupled to the first output of the second current mirror, and an output;
- a first transistor having a gate coupled to the output of the inverter, a drain coupled to the second output of the second current mirror, and a source coupled to ground;
- and
- a second transistor having a gate coupled to an input of the first current mirror through a first switch and coupled to a source of supply voltage through a second switch, a source coupled to the source of supply voltage, and a drain for providing the switched current, wherein the second transistor comprises an MOS transistor.
3 more elements
A circuit for providing a switched current comprising:
- a first current mirror;
- a second current mirror for receiving an input current having first and second outputs coupled to the first current mirror;
- an inverter having an input coupled to the first output of the second current mirror, and an output;
- a draining transistor having a gate coupled to the output of the inverter, a drain coupled to the second output of the second current mirror, and a source coupled to ground;
- and
- a switched MOS output transistor having a gate coupled to an input of the first current mirror, a source coupled to a source of supply voltage, and a drain for providing the switched current.
3 more elements
Dependencies are inferred from the claim text.