| 摘要 |
A temperature compensated voltage gain stage (50) has a first current path, including a first bipolar transistor (12), a first load resistor (16), and a first PTAT current source (20) connected in series, and a second current path including a second bipolar transistor (14), a second load resistor (18), and a second PTAT current source (22) connected in series. A third resistor (24,26) is connected between the first and second current paths. First and second current sources (52,54) having a negative current to temperature relationship are connected to supply current to respective the first and second current paths in proportion to temperature induced current changes in the first and second current paths. As a consequence, a band-gap voltage is developed across the load resistors (16,18), providing for an output from the gain state that is essentially temperature independent.
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