Amplifiers – With periodic switching input-output
Patent
1981-02-03
1982-10-19
Mullins, James B.
Amplifiers
With periodic switching input-output
H03F 102
Patent
active
043552854
ABSTRACT:
A temperature stable bandgap voltage reference source utilizing bipolar transistors biased at different emitter current densities is provided. Switched capacitors are used to input the V.sub.be and the .DELTA.V.sub.be of the transistors (PTC and NTC voltages, respectively,) into an operational amplifier to provide a reference voltage proportional to the sum of the PTC and NTC voltages. Proper selection of the ratio of the switched capacitors renders the reference voltage substantially independent of temperature. In a modified form of the reference, the reference amplifier is implemented by an auto-zeroed operational amplifier which uses switched capacitor techniques and an integrated capacitor to achieve the auto-zeroing function.
REFERENCES:
patent: 4297642 (1981-10-01), Baldwin et al.
Kelley Stephen H.
Ulmer Richard W.
Whatley Roger A.
King Robert L.
Motorola Inc.
Mullins James B.
Myers Jeffrey Van
Sarli, Jr. Anthony J.
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