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US 6,211,583 B1Granted
High speed current switch
AssigneeMotorola, Inc.
InventorScott Robert Humphreys
Life of this patent
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Abstract
A high-speed current switch (36) comprises a differential switch (14), a current source (12), an op-amp (32), a feedback switch (38), a hold capacitor (40), a biasing transistor (42), and a second current switch (44). The high-speed current switch (36) receives a complementary control signal (46) and a control signal (48), and generates an output current (26).
Claims7
A high-speed current switch receiving a control signal and a complementary, control signal, and having an output terminal, an internal node, a supply node, and a ground node, the high-speed current switch comprising:
- a current source coupled to the ground node;
- a differential switch coupled to the current source, the internal node, and the output terminal, wherein the differential switch receives the control signal and the complementary control signal;
- an op-amp having a first op-amp input coupled to the output terminal, a second op-amp input coupled to the internal node, and an op-amp output;
- a feedback switch coupled to the op-amp output;
- a biasing transistor having a biasing gate coupled to the output of the feedback switch, a biasing source coupled to the supply node, and a biasing drain;
- and
- a second current switch, coupled between the drain of the biasing transistor and the internal node.
4 more elements
A high-speed current switch comprising:
- a differential switch, utilized to switch a current source between an internal node and an output terminal in response to a control signal;
- an op-amp, having an output coupled to a biasing transistor for establishing an operating voltage at the internal node which is equivalent to a voltage at the output, in response to inputs coupled to the internal node and the output terminal,
- the biasing transistor being coupled to the output of the op-amp by a feedback switch, and further coupled to the internal node by a second current switch when the internal node is selected by the differential switch.
Dependencies are inferred from the claim text.