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US 2003/0201791 A1Published application
Integrated bias reference
AssigneeConexant Systems, Inc.
InventorsPaul Andrys, David Ripley
Life of this patent
Estimating the term…
Abstract
An improved integrated bias reference provides a temperature and supply stable bias for devices such as radio frequency amplifiers with less complexity and expense than conventional bias references. The bias reference may be integrated onto a single GaAs die with other active circuitry such as an amplifier.
Claims20
A bias reference comprising:
- an enable supply voltage input;
- a constant voltage reference circuit coupled to the enable supply voltage input, the constant voltage reference circuit comprising a proportional-to-absolute-temperature (PTAT) current source summed with a Vbe current source and a constant voltage output referenced to the enable supply voltage input;
- a current conveyor circuit coupled to the constant voltage output, the current conveyor circuit comprising an input stage comprising a differential amplifier and an output stage comprising a supply transistor driving a reference transistor;
- and
- a bias reference output coupled to current conveyor circuit.
2 more elements
An integrated bias reference comprising:
- a GaAs substrate;
- a constant voltage reference circuit fabricated on the substrate and comprising a proportional-to-absolute-temperature (PTAT) current source summed with a Vbe current source and a constant voltage output;
- a current conveyor circuit fabricated on the substrate and coupled to the constant voltage output, the current conveyor circuit comprising an input stage comprising a differential amplifier and an output stage comprising a supply transistor driving a reference transistor;
- and
- a bias reference output coupled to the current conveyor circuit.
2 more elements
An integrated bias reference comprising:
- a GaAs substrate;
- a constant voltage reference circuit fabricated on the substrate and comprising a temperature independent voltage output;
- an input stage fabricated on the substrate and coupled to the temperature independent voltage output, the input stage comprising a replicated temperature independent voltage node;
- a reference transistor fabricated on the substrate and coupled to the replicated temperature independent voltage node;
- and
- a bias reference output coupled to the reference transistor.
3 more elements
Dependencies are inferred from the claim text.