Verilog-A modeling of BJT NQS excess phase

This paper presents a novel Verilog-A model that implements an idealized frequency dependent phase shift (excess-phase) in the small-signal transconductance but, unlike previous approaches, introduces no magnitude dependence. It has been claimed that Verilog-A cannot model BJT NQS behavior when the delay time depends on bias. We also introduce a new Verilog-A model that provides a correct implementation of bias dependent NQS effects for BJTs.