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Abstract

A frequency doubling circuit which produces a pair of pulses for each cycle of an input pulse applied thereto includes an inverter for producing a pulse that is inverted with respect to the applied input pulse. The inverted pulse is directly applied to a first input of an exclusive OR gate and a time delayed inverted pulse produced from the inverter output pulse is applied to a second input of the gate to produce the pair of pulses in response to the leading and trailing edges of the input pulse. The pair of pulses are then applied to a pulse stretching circuit which produces corresponding output pulses the pulsewidths of which are greater than the pulsewidths of the pulses applied thereto. A plurality of the frequency doubling circuits may be utilized to sequentially drive the pulse stretching circuit by OR'ing the outputs of the former to the latter. In such case a frequency doubling tachometer is realized that can be used in a closed loop DC Motor control system.

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