Multistage amplifier
AssigneeMitsubishi Electric Corporation
InventorTetsuya Heima
Life of this patent
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Abstract
A first transistor has a first terminal and a second terminal. A second transistor has a third terminal, a fourth terminal and a fifth terminal electrically connected to the second terminal of the first transistor during amplification performed by the first transistor. A first bias circuit is electrically connected to the first terminal of the first transistor and supplies a first bias to the first terminal so that a magnitude of the first bias is increased with a rise in circuit temperature. A second bias circuit is electrically connected to the third terminal of the second transistor and supplies a second bias to the third terminal so that the magnitude of the second bias is constantly maintained with respect to changes in the circuit temperature.
Claims11
A multistage amplifier comprising:
- a first transistor having a first terminal to which an input signal is input and a second terminal from which a signal obtained by amplifying the input signal is output;
- a second transistor having a third terminal to which the signal amplified by the first transistor is input, a fourth terminal from which a signal obtained by amplifying the signal received by the third terminal is output and a fifth terminal electrically connected to the second terminal of the first transistor during amplification performed by the first transistor;
- a first bias circuit electrically connected to the first terminal of the first transistor and supplying a first bias to the first terminal so that a magnitude of the first bias is increased with a rise in circuit temperature;
- and
- a second bias circuit electrically connected to the third terminal of the second transistor and supplying a second bias to the third terminal so that the magnitude of the second bias is constantly maintained with respect to changes in the circuit temperature, wherein
- the second terminal and the fifth terminal are electrically connected to an intermediate node, and the multistage amplifier further comprises an adjustment circuit to change an amount of a current flowing through the intermediate node so that a current flowing in the second terminal of the first transistor differs from a current flowing through the fourth terminal and the fifth terminal of the second transistor.
Dependencies are inferred from the claim text.