Signal processors with transfer function coefficients determined by timing

Signal processors are proposed which can be implemented using only delay elements, analog gates, an unweighted summer and a low-pass filter or integrator. It is shown that in some cases even the summer and the low-pass filter can be omitted. The transfer function coefficients depend on timing, and are independent of values or even value ratios of elements. The proposed filters can be made fully programmable by using programmable timing, and are suitable for integration using MOS technology; in fact, coefficient resolution improves with the advent of technology.