A new technique for obtaining a very large time-constant integrated filter is proposed. The time-constant of the filter is made proportional to r0C, where r0 is the output impedance of a transistor. Since 1/r0 is proportional to the bias current, the filter cut-off frequency is linearly programmable. The technique is demonstrated ex- perimentally using a simple circuit.

A dynamic logic gate without switching power using an inductor! A new dynamic logic gate that consumes almost no switching power is presented. The stored energy on the load capacitance is transferred to an inductor during logic evaluation and recovered back during precharge. Simulations indicate that such integrated logic gates are possible. They consume about three times less power compared to conventional CMOS or dynamic logic gates.