Reference generator using FET devices with different gate work functions
AssigneeAnalog Devices International Unlimited Company
InventorsChiong Yew Lai, Lei Liu
Life of this patent
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Abstract
A reference signal generator circuit can be configured to provide a temperature-compensated voltage reference signal at an output node. The reference signal generator can include a diode-connected first FET device coupled between a supply node and the output node, and a flipped-gate transistor coupled between the output node and a reference node. The reference signal generator can include a bias current source configured to provide a bias current to the output node to adjust a current density in the flipped-gate transistor relative to a current density in the first transistor.
Claims19
A reference signal generator configured to provide a voltage reference signal at an output node, the reference signal generator comprising:
- a first transistor coupled between a first node and the output node;
- a flipped-gate transistor coupled between the output node and a reference node;
- and
- a bias current source configured to provide an adjustable bias current to the flipped-gate transistor, wherein the bias current source comprises multiple transistor devices coupled in parallel, and wherein selected transistor devices of the multiple transistor devices are selected to provide the adjustable bias current to the flipped-gate transistor.
A reference signal generator configured to provide a voltage reference signal at an output node, the reference signal generator comprising:
- a first transistor coupled between a first node and the output node;
- a flipped-gate transistor coupled between the output node and a reference node;
- a bias current source configured to provide an adjustable bias current to the flipped-gate transistor;
- and
- a first current source configured to provide a reference current to a drain node of the first transistor.
A method for providing a voltage reference signal at an output node using a reference signal generator, the method comprising:
- providing a first bias signal at a drain terminal of a diode-connected first transistor, the first transistor coupled between a supply node and the output node;
- providing at least a portion of the first bias signal at a drain terminal of a flipped-gate transistor that is coupled between the output node and a reference node;
- and
- providing a second bias signal to the flipped-gate transistor at the output node.
A reference signal generator configured to provide a voltage reference signal at an output node, the reference signal generator comprising:
- a diode-connected first FET device coupled between a first node and the output node;
- a flipped-gate transistor coupled between the output node and a reference node;
- and
- a bias current source coupled to the output node.
Dependencies are inferred from the claim text.