H - Electricity – 03 – B
Patent
H - Electricity
03
B
328/11, 354/77
H03B 19/10 (2006.01) G06G 7/22 (2006.01) H03B 19/00 (2006.01)
Patent
CA 1176713
FREQUENCY MULTIPLYING CIRCUIT FOR AN OPTICAL ENCODER ABSTRACT OF THE DISCLOSURE A frequency multiplying circuit for producing double frequency sine and cosine output signals sin 2x and cos 2X from sine and cosine input signals sin x and cos x, comprising two multiplier circuits, each having an output e0 and four inputs a1, a2, b1 and b2 and being adapted to perform multi- plication in accordance with the following relation: e0 = K (a1 - a2) (bl - b2) ; sine and cosine input amplifiers for supplying the sin x and cos x input signals; leads for supplying the cos x input signal to the a1 input of the first multiplier circuit and to the a1 and b1 inputs of the second multiplier circuit, an amplifier affording a gain of 2 for supplying a 2 sin x signal to the b1 input of the first multiplier circuit, leads for supplying zero input to the a2 and b2 inputs of the first multiplier circuit; a phase inverter for supplying a negative sin x input to the a2 input of the second multiplier circuit; and a lead for supplying the sin x input signal to the b2 input of the second multiplier circuit, whereby the first and second multiplier circuits develop output signals proportional to sin 2x and cos 2x, respectively.
386744
Bei Electronics Inc.
Smart & Biggar
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