| 摘要 |
PURPOSE:To obtain a bias circuit that can increase the input impedance of a transistor with no use of a high resistance, by combining two transistors different in polarity. CONSTITUTION:The base of a lateral PNP transistor TRQ2 is connected to the base of an NPN TRQ1, and the bias voltage is supplied to the emitter of the TRQ2 via a resistance R and a power supply V1. In such a constitution, it is possible to form a bias circuit having >=50KOMEGA input impedance just with a resistance R of about 1KOMEGA and a lateral PNP TR. Furthermore the stable base voltage of the TRQ1 can be secured with use of a lateral TR. The same effect is also secured even in case the polarities of both transistors are reversed to each other. |
