Power amplifier open loop current clamp
First Claim
1. An open loop current clamp to restrict the current draw of a first transistor, the open loop current clamp comprising:
- a current trim module including a voltage source having a voltage output terminal to provide a reference voltage, an adjustable resistive load and a control value generator configured to provide a control value as a function of the reference voltage and a voltage drop across the adjustable resistive load; and
a limiting first current source having respective input and output terminals, the input terminal coupled to the current trim module to receive the control value, and the output terminal coupled to a first control terminal of the first transistor to provide a limiting electrical level produced in response to the control value, such that the limiting electrical level substantially sets a first mode of operation for the first transistor such that the current draw of the first transistor is substantially determined by the first mode of operation and the limiting electrical level such that a voltage at a first output terminal of the first transistor exerts reduced influence on the current draw.
1 Assignment
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Accused Products
Abstract
Various implementations include circuits, devices and/or methods that provide open loop current limiting power amplifiers and the like. In some implementations, an open loop current clamp includes a trim module to provide a control value and a limiting source having respective input and output terminals. The input terminal is coupled to the trim module to receive the control value. The output terminal coupled to a control terminal of the first transistor to provide a limiting electrical level produced in response to the control value by the limiting source. The limiting electrical level substantially setting a first mode of operation for the first transistor such that the current draw of the first transistor is substantially determined by the first mode of operation and the limiting electrical level such that a voltage at an output terminal of the first transistor exerts reduced influence on the current draw.
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Citations
20 Claims
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1. An open loop current clamp to restrict the current draw of a first transistor, the open loop current clamp comprising:
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a current trim module including a voltage source having a voltage output terminal to provide a reference voltage, an adjustable resistive load and a control value generator configured to provide a control value as a function of the reference voltage and a voltage drop across the adjustable resistive load; and a limiting first current source having respective input and output terminals, the input terminal coupled to the current trim module to receive the control value, and the output terminal coupled to a first control terminal of the first transistor to provide a limiting electrical level produced in response to the control value, such that the limiting electrical level substantially sets a first mode of operation for the first transistor such that the current draw of the first transistor is substantially determined by the first mode of operation and the limiting electrical level such that a voltage at a first output terminal of the first transistor exerts reduced influence on the current draw. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A power amplifier module comprising:
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a packaging substrate configured to receive a plurality of components; a power amplifier circuit provided in a die included on the packaging substrate, the power amplifier including a first transistor having a first control terminal and a first output terminal; a current trim module including a voltage source having a voltage output terminal to provide a reference voltage, an adjustable resistive load and a control value generator configured to provide a control value as a function of the reference voltage and a voltage drop across the adjustable resistive load; and a limiting first current source having respective input and output terminals, the input terminal coupled to the current trim module to receive the control value, and the output terminal coupled to the first control terminal of the first transistor to provide a limiting electrical level produced in response to the control value, such that the limiting electrical level substantially sets a first mode of operation for the first transistor such that the current draw of the first transistor is substantially determined by the first mode of operation and the limiting electrical level such that a voltage at the first output terminal of the first transistor exerts reduced influence on the current draw. - View Dependent Claims (17, 18)
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19. A radio frequency (RF) device comprising:
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a transceiver configured to process RF signals; an antenna in communication with the transceiver configured to facilitate transmission of an amplified RF signal; and a power amplifier module connected to the transceiver and configured to generate the amplified RF signal, the power amplifier module including a first transistor, a current trim module including a voltage source having a voltage output terminal to provide a reference voltage, an adjustable resistive load and a control value generator configured to provide a control value as a function of the reference voltage and a voltage drop across the adjustable resistive load, and a limiting first current source having respective input and output terminals, the input terminal coupled to the current trim module to receive the control value, and the output terminal coupled to a first control terminal of the first transistor to provide a limiting electrical level produced in response to the control value, such that the limiting electrical level substantially sets a first mode of operation for the first transistor such that the current draw of the first transistor is substantially determined by the first mode of operation and the limiting electrical level such that a voltage at a first output terminal of the first transistor exerts reduced influence on the current draw. - View Dependent Claims (20)
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Specification