इस अभिनति को 'बेस बायस' अथवा 'फिक्स्ड रेजिस्टैन्स बायस' भी कहते हैं। सामने के चित्र में कलेक्टर और बेस दोनों के लिए एक ही डीसी सप्लाई (जैसे बैटरी) का उपयोग किया गया है, किन्तु दो अलग-अलग सप्लाई भी प्रयोग किए जा सकते हैं।

इस चित्र के सन्दर्भ में-

अतः,

For a given transistor, V does not vary significantly during use. As V is of fixed value, on selection of R, the base current I is fixed. Therefore, this type is called "fixed bias" type of circuit.

Also for given circuit,

Therefore,

The common-emitter current gain of a transistor is an important parameter in circuit design, and is specified on the data sheet for a particular transistor. It is denoted as β on this page.

अतः

we can obtain I as well. In this manner, operating point given as (V,I) can be set for given transistor.

लाभ:

अलाभ:

उपयोग:

Due to the above inherent drawbacks, fixed bias is rarely used in linear circuits (i.e., those circuits which use the transistor as a current source). Instead, it is often used in circuits where transistor is used as a switch. However, one application of fixed bias is to achieve crude automatic gain control in the transistor by feeding the base resistor from a DC signal derived from the AC output of a later stage.

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