| 摘要 |
An electronic biasing circuit provides a DC bias voltage (Vg) to a circuit (AMPL; AMPLdiff) to be biased. The biasing circuit has a first transistor (M1a) and a second transistor (M2a). A gate of the first transistor (M1a) is connected to a gate of the second transistor (M2a) and supplies the DC bias voltage. A source of the first transistor (M1a) is connected to a supply reference voltage. A source of the second transistor (M2a) is connected to the supply reference voltage via a resistor element (Rb). The currents flowing through the first and second transistor (M1a, M2a) are forced to be equal. A third transistor (M1b) is connected in series with the first transistor (M1a) and a fourth transistor (M2b) is connected in series with the second transistor (M2a). A gate of the third transistor (M1b) is connected to a gate of the fourth transistor (M2b). A source of the third transistor (M1b) is connected to a drain of the first transistor (M1a). A source of the fourth transistor (M2b) is connected to a drain of the second transistor (M2a). Currents flowing through the third and fourth transistors (M1b, M2b) are forced to be equal. |
