| 摘要 |
924,203. Tunnel-diode bi-stable circuits. NIPPON TELEGRAPH & TELEPHONE PUBLIC CORPORATION. Jan. 25, 1961 [Feb. 15, 1960 (2)], No. 2983/61. Class 40 (6). In order to ensure that a bi-stable circuit comprising series-connected tunnel diodes D1, D2 energized by clock pulses + E,- E resumes its previous state upon application of a subsequent clock pulse, unless that state has been altered by the application of a suitably poled input pulse at terminal 4, an energy storage circuit comprising a parallel RC circuit as shown or a parallel LC circuit, Fig. 6 (not shown), is connected between the junction point of the two diodes and earth. In order to change the state of the circuit an input pulse is applied at terminal 4 just prior to the application of a clock pulse. The action of the input pulse may be inhibited during any clock pulse interval by continuing the clock-pulse energization throughout that interval, i.e. the levels + E, - E are continued up to and including the next clock pulse. Read out is effected by the application of read-out pulses, similar in form to the clock pulses, to terminals 1, 2 mid-way during a clock-pulse period, the state of the circuit being indicated by the sign of the pulse appearing on terminal 5. Where a parallel tuned circuit is used as the energy-storage circuit, its resonant frequency is chosen to be equal to the reciprocal of the clock pulse period or three times that value. |
