Bias circuit structure applied to various voltages

Abstract

The invention provides a bias circuit structure applied to various voltages, and belongs to the technical field of electronic circuits. The bias circuit structure comprises a first current reference module changing along with the power voltage and a second current reference module not changing along with the power voltage; the output end of the first current reference module is a current reference NTC with a negative temperature coefficient, and the output end of the second current reference module is a current reference PTC with a positive temperature coefficient; and the output end of the first current reference module and the output end of the second current reference module are of a parallel structure, and the output end of the first current reference module and the output end of the second current reference module which are connected in parallel serve as the output end of the bias circuit structure. According to the invention, the bias current and the voltage have certain correlation, the change is small along with the temperature change, and the bias current is not sensitive to the temperature.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and in particular relates to a bias circuit structure applied to multiple voltages. Background technique [0002] Any circuit system needs to work at a stable operating point, which is called a static operating point in the present invention. Each circuit system needs such a module to provide bias current or bias voltage. For example, the cascode tube in the cascode structure needs voltage bias to ensure that it works in the amplification area, while the op amp and comparator need the tail current of the PTAT to bias the static operating point, and the reference voltage source is at startup In order to avoid zero state, it is also required that the bias circuit contains a start-up circuit. In chip circuit design, the reference source is related to the success or failure of the integrated circuit design. The power supply voltage provided by the external power supply system is often t...

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Problems solved by technology

However, the circuit structure also has a temperature coefficient, and cannot achieve zero temperature coefficient

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