Transistor schematic reference9/23/2023 ![]() ![]() Compensation may be provided for both first and second order non-linearities. A gate length of at least one of the transistors may be tuned to compensate for temperature-related non-linearities. The reference voltage output from the circuit may be generated based on the currents flowing through the various transistors, with the reference voltage output node being coupled to a source or a drain terminal of a selected one of the transistors. One or more current sources may provide current to one or more of the transistors in the circuit. The remaining NMOS transistors include n-type polysilicon implants on their respective gate terminals. The first transistor, which is the flipped-gate transistor (and which may also be referred to as an anti-doped transistor) has a gate terminal implemented with a p-type polysilicon implant. In one embodiment, the first, second, third and fourth transistors are NMOS transistors. The circuit is configured to generate a reference voltage equal to a sum of gate-source voltages of the first and third transistors, minus respective gate-source voltages of the second and fourth transistors. The second third and fourth transistors have a corresponding type polysilicon implants (e.g., NMOS transistors having respective gate terminals with an n-type polysilicon implant). The first transistor is a flipped-gate transistor having a gate terminal of an opposite polarity (e.g., an n-channel metal oxide semiconductor, or NMOS, transistor having a gate terminal with a p-type polysilicon implant). In one embodiment, a bandgap circuit includes first, second, third and fourth transistors. SUMMARYĪ reference voltage generation circuit (or bandgap circuit) having a flipped-gate transistor is disclosed. Other components, such as resistors, may also be implemented on the integrated circuit as part of the bandgap circuit that uses MOS transistors. In some smaller integrated circuit processes, metal-oxide semiconductor (MOS) transistors may be used to form circuits for the generation of reference voltages. Some bandgap circuits are implemented using bi-polar junction transistors (BJTs), along with other components such as resistors and capacitors. One commonly used circuit to generate a reference voltage is known as a bandgap circuit. Various types of circuits may be utilized to generate the reference voltage. The difference between these two voltages is amplified by the error amplifier, and the output voltage of the voltage regulator is provided based on the reference voltage and the error. For example, voltage regulators commonly include an error amplifier having one input on which a reference voltage is received, while a feedback voltage is received on another input. Many circuits used in electronic systems and on integrated circuits utilize one or more reference voltages. This disclosure is directed to electronic circuits, and more particularly, to circuits used to generate a reference voltage. ![]()
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