Power amplifier capable of maintaining constant gain regardless of temperature variations
AssigneeRichWave Technology Corp.
InventorsTien-Yun Peng, Chih-Sheng Chen
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Abstract
A power amplifier includes a transistor, a temperature sensor and a filter. The transistor is used to receive a bias signal and amplify a radio frequency (RF) signal. The temperature sensor is arranged in proximity to the transistor, and is used to detect a temperature of the transistor to provide a voltage signal at a control node accordingly. The filter is coupled to the temperature sensor and is used to filter the voltage signal to generate a filtered voltage. The bias signal is adjusted according to the filtered voltage.
Claims19
A power amplifier comprising:
- a first transistor configured to receive a bias signal and amplify a radio frequency (RF) signal;
- a temperature sensor arranged in proximity to the first transistor, and configured to detect a temperature of the first transistor to provide a first voltage signal at a control node accordingly;
- a first filter coupled to the temperature sensor, configured to filter the first voltage signal to generate a filtered voltage, and comprising:
- a variable impedance component configured to adjust an impedance according to a control signal to provide a first impedance in a first interval, and provide a second impedance in a second interval;
- wherein the bias signal is adjusted according to the filtered voltage.
A power amplifier comprising:
- a first transistor configured to receive a bias signal and amplify a radio frequency (RF) signal;
- a temperature sensor arranged in proximity to the first transistor, and configured to detect a temperature of the first transistor to provide a first voltage signal at a control node accordingly;
- a first filter coupled to the temperature sensor and configured to filter the first voltage signal to generate a filtered voltage;
- a reference node coupled to a current source or a voltage source;
- and
- a second filter coupled between the reference node and the control node, and configured to filter the first voltage signal;
- wherein the bias signal is adjusted according to the filtered voltage.
A power amplifier comprising:
- a first transistor configured to receive a bias signal and amplify a radio frequency (RF) signal;
- a temperature sensor arranged in proximity to the first transistor, and configured to detect a temperature of the first transistor to provide a first voltage signal at a control node accordingly;
- and
- a first filter coupled to the temperature sensor and configured to filter the first voltage signal to generate a filtered voltage;
- wherein the first voltage signal comprises a noise from the temperature sensor, the first filter is configured to filter out the noise to prevent the noise from affecting the bias signal;
- and
- the bias signal is adjusted according to the filtered voltage.
Dependencies are inferred from the claim text.