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US 6,184,743 B2Granted
Bandgap voltage reference circuit without bipolar transistors
AssigneeInternational Business Machines Corporation
InventorDavid Peter Swart
Life of this patent
Estimating the term…
Abstract
A gallium arsenide (GaAs) bandgap circuit includes a plurality of stacked GaAs transistors being connected as Schottky diodes which, together with an amplifier, provide a constant reference voltage being independent of a power supply voltage of the circuit.
Claims23
A gallium arsenide (GaAs) circuit having an input and a voltage output node, comprising:
- a plurality of stacked GaAs transistors being connected as Schottky diodes which provide a constant reference voltage at the output of the circuit, the reference voltage being independent of the input of the circuit;
- wherein the Schottky diodes are stacked in a first branch and a second branch, the first and second branches being electrically connected in parallel between the voltage output node and ground, respectively;
- wherein, in the first branch, a first resistor is electrically connected between the voltage output node and a first node, in the second branch, a second resistor is electrically connected between the voltage output node and a second node;
- wherein the circuit further includes an amplifier with a first input electrically connected to the first node, a second input electrically connected to the second node, and an output electrically connected to the voltage output node;
- and
- wherein the first branch includes a plurality of sub-branches, each of which includes the same number of Schottky diodes as in the second branch.
3 more elements
A gallium arsenide (GaAs) circuit having an input and a voltage output node, comprising:
- a plurality of stacked GaAs transistors being connected as Schottky diodes, the Schottky diodes being stacked in a first branch and a second branch, wherein the first and second branches are electrically connected in parallel between the voltage output node and ground, respectively;
- an amplifier having a first input electrically connected to the first branch, a second input electrically connected to the second branch, and an output electrically connected to both first and second branches, wherein the input of the circuit is a power supply of the amplifier, and the output of the circuit is the output of the amplifier;
- and
- means for providing a same electrical current in the first branch and the second branch and for providing a constant reference voltage at the output of the circuit, such that the reference voltage is independent of the input of the circuit, wherein the means for providing the same electrical current in the first branch and the second branch and for providing the constant reference voltage at the output of the circuit includes;
- in the first branch, a first resistor is electrically connected between the voltage output node and a first node, and in the second branch, a second resistor is electrically connected between the voltage output node and a second node;
- the first input of the amplifier electrically connected to the first node, the second input of the amplifier electrically connected to the second node, and the output of the amplifier electrically connected to the voltage output node;
- and
- the first branch includes a plurality of sub-branches, each of which includes the same number of Schottky diodes as in the second branch.
5 more elements
A gallium arsenide (GaAs) voltage reference circuit having an output node, comprising:
- an amplifier having a first input and a second input, and an output electrically connected to said output node;
- a first branch connected between said output node and ground and providing said first input to said amplifier, said first branch including a plurality of parallel sub-branches, each sub-branch containing N GaAs field-effect transistors (FETs) of a first configuration, N>1, wherein each GaAs FET of a first configuration is configured with its respective source and drain electrically coupled together to form a first terminal of the GaAs FET of a first configuration and the gate forming a second terminal of the GaAs FET of a first configuration;
- a second branch connected between said output node and ground in parallel with said first branch and providing said second input to said amplifier, said second branch containing N GaAs FET of said first configuration.
Dependencies are inferred from the claim text.