Georgia Tech inventors have created a tunable CMOS resistor that can be fully integrated in a standard CMOS technology with low-power and low-voltage applications. It is built by exploiting the capacitive coupling and voltage storage capabilities of a floating-gate transistor. In addition, a scaled-gate linearization technique is utilized to suppress the transistor nonlinearities in the triode region, tuning the resistance of the circuit.
- Tunable – enables the design requirements of DACs and quantizes by allowing for tenability
- Adaptable – can be fully integrated in a standard CMOS technology
- Low-power and low-voltage
- Design flexibility
- Increased accuracy
- Pipelined and sigma-delta ADCs
Tunable CMOS resistors offer a design flexibility in building precision and compact analog circuits. Therefore, they are widely used in transconductance multipliers, highly linear amplifiers, and tunable MOSFET-C filters. While the passive resistors that are implemented by using polysilicon, diffusion, or well strips in a CMOS technology exhibit around .1% matching accuracy, and around 30% tolerance, the tunable CMOS resistors easily achieve high and precise resistance values through the utilization of controllable MOS channel resistance.