Oxygen sensor interface circuit with optimized gain characterist

Details Oxygen sensor interface circuit with optimized gain characterist Oxygen sensor interface circuit with optimized gain characterist

1994-12-05

1995-11-14

Callahan, Timothy P.

Miscellaneous active electrical nonlinear devices, circuits, and

Specific signal discriminating without subsequent control

By amplitude

327 74, 327337, 327362, H03K 522, G06G 718

Patent

active

054670349

ABSTRACT:
A sensor interface circuit and method are provided which realizes common mode rejection, compensates for external input impedance and internal loads and achieves a desired transfer response. 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. RF filtering circuitry is coupled to both inputs. An amplifier having a gain and a first input receives a differential voltage and has an output coupled to a grounded switch for providing an output signal referenced to reference ground. A supply voltage is applied across the inputs and a current is supplied to one of the inputs. A comparator compares a voltage potential on the selected one of the first and second inputs and provides an output which controls a switch for switching the interface circuit output between the amplifier output and a predetermined voltage output. The circuit is particularly useful for automotive applications for interfacing with an oxygen sensor to compensate for the load effects associated with the RF filtering circuitry where voltage excursions may occur between the common mode sensor ground and reference ground.

REFERENCES:
patent: 3906247 (1975-09-01), Heffner
patent: 4093876 (1978-06-01), Henein et al.
patent: 4560890 (1985-12-01), Masuda et al.
patent: 5381053 (1995-01-01), Yasuda
National Semiconductor--Linear Databook 3--1988 Edition pp. 5-190.

Affiliated with

Also associated with

Rating

Oxygen sensor interface circuit with optimized gain characterist does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Oxygen sensor interface circuit with optimized gain characterist, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Oxygen sensor interface circuit with optimized gain characterist will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-1223624