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Bipolar transistors must be properly biased to operate correctly. In circuits made with individual devices (discrete circuits), biasing networks consisting of resistors are commonly employed. Much more elaborate biasing arrangements are used in integrated circuits, for example, bandgap voltage references and current mirrors. The voltage divider configuration achieves the correct voltages by the use of resistors in certain patterns. By selecting the proper resistor values, stable current levels can be achieved that vary only little over temperature and with transistor properties such as β. The operating point of a device, also known as bias point, quiescent point, or Q-point, is the point on the output characteristics that shows the DC collector–emitter voltage (Vce) and the collector current (Ic) with no input signal applied. == Bias circuit requirements == A bias network is selected to stabilize the operating point of the transistor, by reducing the following effects of device variability:
Bipolar transistors must be properly biased to operate correctly. In circuits made with individual devices (discrete circuits), biasing networks consisting of resistors are commonly employed. Much more elaborate biasing arrangements are used in integrated circuits, for example, bandgap voltage references and current mirrors. The voltage divider configuration achieves the correct voltages by the use of resistors in certain patterns. By selecting the proper resistor values, stable current levels can be achieved that vary only little over temperature and with transistor properties such as β. The operating point of a device, also known as bias point, quiescent point, or Q-point, is the point on the output characteristics that shows the DC collector–emitter voltage (Vce) and the collector current (Ic) with no input signal applied. == Bias circuit requirements == A bias network is selected to stabilize the operating point of the transistor, by reducing the following effects of device variability:
Bipolar transistors must be properly biased in order to operate correctly.
What is the purpose of biasing networks in circuits made with individual devices?
What is the purpose of biasing networks in circuits made with individual devices?
To stabilize the operating point of the transistor.
What are some examples of more elaborate biasing arrangements used in integrated circuits?
What are some examples of more elaborate biasing arrangements used in integrated circuits?
Bandgap voltage references and current mirrors.
How does the voltage divider configuration achieve the correct voltages?
How does the voltage divider configuration achieve the correct voltages?
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What is the operating point of a device?
What is the operating point of a device?
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What is the purpose of a bias network in a transistor?
What is the purpose of a bias network in a transistor?
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