I am trying to interface to an oxygen sensor and am interested in a circuit with the following characteristics.
low output impedance. single rail bias into the 0 - 12V range. High input impedance (~1Mohms)
I have seen many single rail op amp applications, yet they all require either zener diode (frequency problems - especially low frequency) and resistor ladders which place the input impedance into the 50kohm range i.e. two 100k in parallel.
Anyone got any ideas how to build a simple single rail input input buffer that yields > 1Mohm input resistance and relatively good low frequency performance?
Thanks in advance