| 摘要 |
<p>A band-gap voltage reference circuit comprising first and second branches (309, 311; 609, 611 ) respectively including first and second groups of transistors (314 to 317; 614 to 617) of different emitter current conduction areas and current sources (319; 619) for running the first and second groups of transistors at different emitter current densities to generate respective base-emitter voltages, and output terminals (104, 106) connected to receive a regulated voltage (Vout) which is a function of the base-emitter voltages of the first and second groups of transistors (314 to 317; 614 to 617). Each of the first and second groups (314 to 317; 614 to 617) includes at least one npn-type transistor (314, 316; 615, 617) and at least one pnp transistor (315, 317; 614, 616) connected with their emitter-collector paths in series in the respective one of the branches (309, 311; 609, 611 ) so as to present cumulated base-emitter voltages across the respective group. The output voltage at the output terminals (104, 106) is responsive both to a difference (?Vb?p+n) between the cumulated base-emitter voltages of the first and second branches and to the cumulated base-emitter voltage (Vbep+n) of that one (309; 609) of the first and second groups with higher emitter current density.</p> |
