Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1994-04-29
1996-03-12
Tran, Toan
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327337, H03K 5153, H03K 522
Patent
active
054989868
ABSTRACT:
A sensor interface circuit is provided which realizes common mode rejection and achieves a desired transfer response while realizing a simplified amplifier arrangement. The interface circuit is particularly useful for amplifying and conditioning signals generated by an oxygen sensor on an automotive vehicle. The sensor interface circuit has first and second inputs for receiving input voltages from a sensor which are joined together to provide a differential voltage representative of the voltage potential between the first and second inputs. One input may receive a common mode ground employed by the sensor. An amplifier having a first input receives a differential voltage at an inverting input and a positive non-zero reference voltage at a non-inverting input. The amplifier has an output coupled to a grounded switch for providing an output signal referenced to reference ground. The circuit is particularly useful for automotive applications for interfacing with an oxygen sensor where voltage excursions may occur between the common mode sensor ground and reference ground.
REFERENCES:
patent: 4290034 (1981-09-01), Fraser et al.
patent: 4313096 (1982-01-01), Fleisher
patent: 4404525 (1983-09-01), Amir et al.
patent: 4429281 (1984-01-01), Ito et al.
LM1964 Sensor Interface Amplifier, National Semiconductor, Linear Data Book 3, 1988 Edition, pp. 5-192.
Delco Electronics Corporation
Funke Jimmy L.
Tran Toan
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