초록 ▼

An anti-aliasing filter with adaptable cutoff frequency. In various embodiments, the filter includes a calibrator/adaptor section and an anti-aliasing filter section. Both sections include a cascaded arrangement of adjustable delay circuits, and the calibrator/adaptor section includes a control circ

An anti-aliasing filter with adaptable cutoff frequency. In various embodiments, the filter includes a calibrator/adaptor section and an anti-aliasing filter section. Both sections include a cascaded arrangement of adjustable delay circuits, and the calibrator/adaptor section includes a control circuit. A reference signal is input to the delay circuits and the control circuit of the calibrator/adaptor section, and an analog input signal is input to the delay circuits of the anti-aliasing filter. The control circuit compares the directly received reference signal to the reference signal from the last delay circuit and generate an adjustment signal responsive to the comparison. The delay intervals of all the delay circuits are adjustable responsive to the adjustment signal from the control circuit.

대표청구항 ▼

1. An adaptive anti-aliasing filter arrangement for filtering an analog input signal with filter characteristics responsive to a reference signal, comprising:a first cascaded arrangement of at least one adjustable delay circuit, wherein a first one of the at least one adjustable delay circuit is arr

1. An adaptive anti-aliasing filter arrangement for filtering an analog input signal with filter characteristics responsive to a reference signal, comprising:a first cascaded arrangement of at least one adjustable delay circuit, wherein a first one of the at least one adjustable delay circuit is arranged to receive the reference signal, and each delay circuit has a delay interval that is adjustable responsive to an adjustment signal; a control circuit coupled to an output port of a last one of the at least one adjustable delay circuit and arranged to directly receive the reference signal, wherein the control circuit makes a comparison between the reference signal and a delayed reference signal from the last one of the at least one adjustable delay circuit and generates the adjustment signal responsive to the comparison; and a filter coupled to the control circuit and having a second cascaded arrangement of at least one adjustable delay circuit responsive to the adjustment signal, wherein a first delay circuit in the second cascaded arrangement is arranged to receive the analog input signal.