| 摘要 |
PROBLEM TO BE SOLVED: To configure a bias circuit (305) so as to eliminate base shot-noise of an output transistor (Qin) which generates amplification and also to eliminate the nose of bias resistor (Rx1) that is included within the bias circuit (305). SOLUTION: A single-ended circuit, such as an LNA (300), includes an input power matching circuit (310), and the bias circuit (305) connected to the output transistor (Qin). A degeneration inductance (Le) and load impedance (Lo) couple to the emitter and collector of the output transistor (Qin), respectively. Specifically, the bias circuit (305) includes a current reference source (Iref) and an emitter follower circuit (315) connected to a current mirror circuit (Q1, Q2 and Rx2) that connects to a bias resistor (Rx1). The bias circuit (305) can be implemented in a wide-class of single-ended circuits.
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