Incremental encoder frequency-dividing circuit

TL;DR: In this article, an incremental encoder frequency-dividing circuit was proposed, which consists of a metastable state elimination circuit, a peak filtering circuit, quadruple frequency phase discrimination circuit and a counter circuit.

Abstract: The invention discloses an incremental encoder frequency-dividing circuit. The circuit comprises a metastable state elimination circuit, a peak filtering circuit, a quadruple frequency phase discrimination circuit, a counter circuit and a pulse frequency-dividing circuit, the metastable state elimination circuit removes metastable state phenomena in A-phase pulse signals and B-phase pulse signals output by an incremental encoder and improves the stability of the circuit, the peak filtering circuit removes high-frequency interference in A-phase pulses and B-phase pulses output by the metastable state elimination circuit, the quadruple frequency phase discrimination circuit performs frequency quadruplication on the A-phase pulse signals and the B-phase pulse signals output by the peak filtering circuit and extracts direction signals so that the counter circuit can count the pulse subsequently, the counter circuit performs gain-loss counting according to the counting pulses and the direction signals output by the quadruple frequency phase discrimination circuit, and the pulse frequency-dividing circuit outputs the pulse signals after frequency dividing according to a counting value output by the counter circuit. By employing the circuit, arbitrary frequency-dividing output of the incremental encoder can be realized, and the precision and the anti-interference performance of the encoder can be effectively improved.