Patent ID: 8937991
Filing Date: 2015-01-20
Classification: H03H,H04L

Abstract:
1. An apparatus for filtering an analog signal, comprising: a pulse width encoder configured to receive an analog input signal and convert it into a continuous time puke-width encoded signal; a delay line comprising a plurality of unclocked delay elements in series and connected to the pulse-width encoder for propagating the pulse-width encoded signal; a plurality of buffers, each buffer in the plurality of buffers coupled to receive the delayed pulse-width encoded signal after the pulse-width encoded signal has passed through a separate one of the plurality of delay elements; and a plurality of elements having impedance values, each of the plurality of elements connected to a separate one of the plurality of buffers an impedance value such that the sum of the outputs of the plurality of elements produces a desired frequency response to the pulse-width encoded signal.