H - Electricity – 03 – F
Patent
H - Electricity
03
F
330/106
H03F 1/14 (2006.01) H03F 1/30 (2006.01) H03F 1/34 (2006.01)
Patent
CA 1159523
AUTO-ZEROING OPERATIONAL AMPLIFIER CIRCUIT ABSTRACT A temperature stable bandgap voltage reference source utilizing bipolar transistors 12 and 14 biased at different emitter current densities is provided. Switched capacitors 28 and 34 are used to input the Vbe and the .DELTA.Vbe of the transistors 12 and 14 (PTC and NTC voltages, respec- tively,) into an operational amplifier 42 to provide a reference voltage VREF Proportional to the sum of he PTC and NTC voltages. Proper selection of the ratio of the switched capacitors 28 and 34 renders the reference voltage VREF substantially independent of temperature. In a modified form of the reference source 10, the reference amplifier 22 is implemented by an auto-zeroed operational amplifier 42 which uses switched capacitor techniques and an integrated capacitor 44 to achieve the auto-zeroing function.
393980
Kelley Stephen H.
Ulmer Richard W.
Whatley Roger A.
Gowling Lafleur Henderson Llp
Motorola Inc.
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