Low-noise differential bias circuit and differential signal processing apparatus

摘要

A low-noise differential bias circuit is provided which obtains excellent noise characteristics while ensuring excellent distortion characteristics. A collector of a transistor (Q11) is connected to a voltage supply point (Vcc) via a resistor R15. Abase of the transistor (Q11) is connected to a base of a transistor (Q1) via resistors (R13, R11) connected in series. A connection point between the resistors (R11, R13) is connected to the collector of the transistor (Q11). A collector of a transistor (Q12) is connected to the voltage supply point at connection point A via a resistor (R16). A base of the transistor (Q12) is connected to a base of a transistor (Q2) via resistors (R14, R12) connected in series. A connection point between the resistors (R12, R14) is connected to the collector of the transistor (Q12). By this configuration, a high frequency ground is performed at the connection point A.