Realization of a simple high-value grounded linear resistance in CMOS technology

A resistor circuit suitable for realizing high-values of resistance (>10M/spl Omega/), linear over signal amplitudes of /spl plusmn/100mV is demonstrated. The resistor is variable over a range of /spl plusmn/10%. The design is relatively simple and can be used to AC couple low-frequency analogue signal processing blocks, for example in biomedical engineering applications.