Low noise amplifier and method of controlling amplifier circuit
AssigneeLAPIS Technology Co., Ltd.
InventorToru YOSHIOKA
Life of this patent
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Abstract
A low noise amplifier and a method of controlling an amplifier circuit that can enable detection of a fault are provided. The low noise amplifier includes an amplifier circuit. The amplifier circuit includes an amplification transistor configured to amplify a signal input from an input terminal and to output the amplified signal to a first node, a current mirror circuit configured to supply a bias current to the amplification transistor, a resistor provided on a feedback path for feeding an output of the first node back to the input terminal, and a first switch provided on the feedback path and configured to set up or cut off the feedback path. The feedback path is cut off by the first switch when detection of a fault of the amplification transistor is performed.
Claims17
A low noise amplifier comprising an amplifier circuit, the amplifier circuit including an amplification transistor configured to amplify a signal input from an input terminal and to output an amplified signal to a first node, a current mirror circuit configured to supply a bias current to the amplification transistor, a resistor provided on a feedback path for feeding an output of the first node back to the input terminal, and a first switch provided on the feedback path and configured to set up or cut off the feedback path,
- wherein the feedback path is cut off by the first switch when detection of a fault of the amplification transistor is performed.
A method of controlling an amplifier circuit, the amplifier circuit including an amplification transistor configured to amplify a signal input from an input terminal and to output an amplified signal to a first node, a current mirror circuit configured to supply a bias current to the amplification transistor, a resistor provided on a feedback path for feeding an output of the first node back to the input terminal, and a first switch provided on the feedback path and configured to set up or cut off the feedback path,
- wherein the first switch is controlled to cut off the feedback path, when detection of a fault of the amplification transistor is performed.
Dependencies are inferred from the claim text.