Hot Carrier Injection Compensation
First Claim
Patent Images
1. A radio frequency (RF) amplifier arrangement comprising:
- a first transistor stack configured, during operation, to amplify an RF signal at an input gate of the first transistor stack and provide an amplified version of the RF signal at an output terminal of the first transistor stack;
a second transistor stack configured, during operation, to amplify the RF signal at an input gate of the second transistor stack and provide an amplified version of the RF signal at an output terminal of the second transistor stack;
a first switch operatively connected between the output terminal of the first transistor stack and the output terminal of the second transistor stack, the first switch being configured, during operation, to provide a short or an open between the output terminals of the first and second transistor stacks;
a second switch operatively connected between the output terminal of the second transistor stack and a first terminal of a resistor, the second switch being configured, during operation, to provide a short or an open between the output terminal of the second transistor stack and the first terminal of the resistor, anda bias control module operatively connected to the first terminal of the resistor via an input sense terminal of the bias control module and operatively connected to the input gate of the first transistor stack and the input gate of the second transistor stack via an output terminal of the bias control module.
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Abstract
Methods and devices are described for compensating an effect of aging due to, for example, hot carrier injection, or other device degradation mechanisms affecting a current flow, in an RF amplifier. In one case a replica circuit is used to sense the aging of the RF amplifier and adjust a biasing of the RF amplifier accordingly.
43 Citations
27 Claims
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1. A radio frequency (RF) amplifier arrangement comprising:
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a first transistor stack configured, during operation, to amplify an RF signal at an input gate of the first transistor stack and provide an amplified version of the RF signal at an output terminal of the first transistor stack; a second transistor stack configured, during operation, to amplify the RF signal at an input gate of the second transistor stack and provide an amplified version of the RF signal at an output terminal of the second transistor stack; a first switch operatively connected between the output terminal of the first transistor stack and the output terminal of the second transistor stack, the first switch being configured, during operation, to provide a short or an open between the output terminals of the first and second transistor stacks; a second switch operatively connected between the output terminal of the second transistor stack and a first terminal of a resistor, the second switch being configured, during operation, to provide a short or an open between the output terminal of the second transistor stack and the first terminal of the resistor, and a bias control module operatively connected to the first terminal of the resistor via an input sense terminal of the bias control module and operatively connected to the input gate of the first transistor stack and the input gate of the second transistor stack via an output terminal of the bias control module. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A radio frequency (RF) amplifier arrangement comprising:
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a first transistor stack; a second transistor stack, the second transistor stack being a reduced-size replica of the first transistor stack, and a bias control module configured, during operation, to provide a bias voltage in correspondence of a first-stack bias current and a second-stack bias current of the first and second transistor stacks. - View Dependent Claims (17, 18, 19, 20, 21, 22)
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23. A method for compensating drift of a bias current in a radio frequency amplifier, the method comprising:
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providing a first transistor stack; providing a second transistor stack, the second transistor stack being a reduced-size replica of the first transistor stack; providing a bias voltage to the first and the second transistor stacks in correspondence of a desired first-stack bias current and a desired second-stack bias current of the first and second transistor stacks; coupling the first and second transistor stacks in parallel to provide an amplified RF signal from a common input RF signal; measuring a drift in current of the second-stack bias current; based on the measuring, adjusting the bias voltage to the first and the second transistor stacks, and based on the adjusting, compensating the drift in current of the first-stack and the second-stack bias currents. - View Dependent Claims (24, 25, 26, 27)
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Specification