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US 9,000,828 B2Granted
Multiplexing circuit
AssigneeAnalog Devices, Inc.
InventorMichael Dominic Keane
Life of this patent
Estimating the term…
Abstract
A multiplexing circuit comprising an converter for converting an input voltage signal to an input current signal. A plurality of first current mirrors for mirroring the input current signal. A switching unit selectively switches each first current mirror to a corresponding output.
Claims37
A multiplexing circuit comprising:
- a converter that converts an input voltage signal to an input current signal;
- a plurality of first current mirrors, each producing an individual mirrored current that mirrors one of the input current signal and a summed current signal comprising a sum of the input current signal plus a bias current signal;
- a plurality of outputs corresponding to the plurality of first current mirrors, wherein the outputs are arranged in parallel;
- a switching unit that selectively switches each of the first current mirrors to one of the outputs;
- and
- a plurality of current-to-voltage converters, each connected to a corresponding one of the outputs.
3 more elements
A multiplexing circuit comprising:
- a converter that converts an input voltage signal to an input current signal;
- a bias current source providing a bias current signal;
- a summing node that receives the bias current signal and the input current signal, and provides a resulting summed current signal comprising a sum of the input current signal plus the bias current signal;
- a plurality of first current mirrors, each of the first current mirrors being configured to mirror the summed current signal so as to provide an individual mirrored summed current signal;
- a plurality of second current mirrors, each of the second current mirrors being configured to mirror the bias current signal so as to provide an individual mirrored bias current signal, wherein each of the second current mirrors is associated with a corresponding one of the first current mirrors;
- a plurality of first switches, each individual first switch being associated with a corresponding one of the first current mirrors;
- a plurality of second switches, each individual second switch being associated with a corresponding one of the second current mirrors, wherein each first switch and its corresponding second switch form a switch pair that is connectable to one of a plurality of output nodes, and wherein the output nodes are arranged in parallel;
- and
- a controller that selectively operates the first switches and the second switches to connectively combine one of the individual mirrored summed current signals with a corresponding individual mirrored bias current signal to provide an output current signal at a selected one of the output nodes.
6 more elements
A multiplexing circuit comprising:
- a converter that converts an input voltage signal to an input current signal;
- a current source which provides a bias current signal that is summed with the input current signal to form a summed current signal;
- a plurality of first current mirrors, each of which produces an individual mirrored summed current signal that mirrors the summed current signal;
- a plurality of second current mirrors, each of which produces an individual mirrored bias current signal that mirrors the bias current signal, wherein each respective first current mirror is connected in series with a corresponding second current mirror to form pairs of first and corresponding second current mirrors and each pair of mirrors is connected in parallel;
- a plurality of separate outputs, each connected to a common node of a corresponding pair of current mirrors, wherein the outputs are arranged in parallel;
- and
- a switching unit that selectively switches at least one first current mirror with at least one corresponding second current mirror so that the bias current signal mirrored by the second current mirror combines with the summed current signal mirrored by the first current mirror to form a corresponding output current signal at a selected one of the outputs.
4 more elements
A multiplexing circuit comprising:
- a converter that converts an input voltage signal to an input current signal;
- a bias current source providing a bias current signal;
- a summing node that receives the bias current signal and the input current signal, and provides a resulting summed current signal comprising a sum of the input current signal plus the bias current signal;
- a plurality of first current mirrors, each of the first current mirrors being configured to mirror the summed current signal so as to provide an individual mirrored summed current signal;
- a plurality of second current mirrors, each of the second current mirrors being configured to mirror the bias current signal so as to provide an individual mirrored bias current signal, wherein each of the second current mirrors is associated with a corresponding one of the first current mirrors;
- a plurality of first switches, each individual first switch being associated with a corresponding one of the second current mirrors;
- and
- a controller that selectively operates the first switches and the second switches to connectively combine individual mirrored summed current signals with a corresponding individual mirrored bias current signal to provide an output current signal at a selected one of a plurality of parallel output nodes.
5 more elements
A method of multiplexing, the method comprising:
- a. converting an input voltage signal to an input current signal;
- b. providing a bias current that is summed with the input current signal to form a summed current signal;
- c. mirroring the summed current signal with a plurality of first current mirrors;
- d. mirroring the bias current signal with a plurality of second current mirrors;
- and
- e. selectively switching individual first current mirrors with corresponding second current mirrors so that the bias current signal mirrored by one of the second current mirrors combines with the summed current signal mirrored by one of the first current mirrors to form an output current signal at a selected one of a plurality of parallel output nodes, wherein each of the output nodes is connectable via the selective switching to a current mirror pair comprising one of the first current mirrors and a corresponding one of the second current mirrors.
3 more elements
A multiplexing circuit comprising:
- a converter that converts an input voltage signal to an input current signal;
- a current source which provides a bias current signal that is summed with the input current signal to form a summed current signal;
- a plurality of first current mirrors that mirror the summed current signal;
- a plurality of second current mirrors that mirror the bias current signal;
- and
- a switching unit that selectively switches one of the first current mirrors with one of the second current mirrors so that the bias current signal mirrored by the one of the second current mirrors combines with the summed current signal mirrored by the one of the first mirrors to form an output current signal at a selected one of a plurality of parallel output nodes, wherein each of the output nodes is connectable via the selective switching to a current mirror pair comprising one of the first current mirrors and a corresponding one of the second current mirrors.
3 more elements
Dependencies are inferred from the claim text.