Schottky enhanced bias circuit
AssigneeSkyworks Solutions, Inc.
InventorDavid Steven Ripley
Life of this patent
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Abstract
Embodiments disclosed herein relate to a bias circuit that uses Schottky diodes. Typically, a bias circuit will include a number of transistors used to generate a bias voltage or a bias current for a power amplifier. Many wireless devices include power amplifiers to facilitate processing signals for transmission and/or received signals. By substituting the bias circuit design with a design that utilizes Schottky diodes, the required battery voltage of the bias circuit may be reduced enabling the use of lower voltage power supplies.
Claims21
(canceled)
A bias circuit comprising:
- a first Schottky diode associated with a first current density;
- a second Schottky diode associated with a second current density;
- a feedback loop positioned between the first Schottky diode and the second Schottky diode, and omitting the first Schottky diode and the second Schottky diode;
- and
- a frequency compensation circuit that stabilizes the feedback loop.
A semiconductor die comprising:
- a power amplifier;
- and
- a bias circuit configured to set a quiescent operating point of the power amplifier, the bias circuit including a first Schottky diode associated with a first current density, a second Schottky diode associated with a second current density, a feedback loop positioned between the first Schottky diode and the second Schottky diode, and a frequency compensation circuit that stabilizes the feedback loop, the feedback loop omitting the first Schottky diode and the second Schottky diode.
A wireless device comprising:
- a semiconductor die including a power amplifier and a bias circuit, the bias circuit configured to set a quiescent operating point of the power amplifier, the bias circuit including a first Schottky diode associated with a first current density, a second Schottky diode associated with a second current density, a feedback loop positioned between the first Schottky diode and the second Schottky diode, and a frequency compensation circuit that stabilizes the feedback loop, the feedback loop omitting the first Schottky diode and the second Schottky diode;
- and
- an envelope tracker configured to control a voltage level of a power amplifier supply voltage provided to the power amplifier.
Dependencies are inferred from the claim text.