| 摘要 |
945,633. Transistor switching circuits. PHILIPS ELECTRICAL INDUSTRIES Ltd. Aug. 14, 1962 [Aug. 17, 1961], No. 31164/62. Heading H3T. In a circuit for switching a pulse signal without distortion at any arbitrary moment, the signal is differentiated at 4, the resulting needle-like pulses corresponding to the leading edges being fed to the 1 inputs of bi-stable circuits FF 1 , FF 2 , whilst the needle-like pulses corresponding to the trailing edges of the signal are fed to the 0 input of FF 1 . A switch S, controlling the output, is provided in the 1 input lead of FF 1 . As described, the bi-stable circuits may be transistorized Eccles-Jordan circuits. Circuit FF 1 provides, at f, a continuous output which is an anti-phased version of the input square wave signal at a. The signal at f is differentiated at 5, the resulting positive needle-like pulses being passed via diode 8 to FF 2 so that anti-phased square wave outputs corresponding to the input at a, are provided at 2 and 3. Switch S is opened when it is desired to terminate the signals at 2 and 3, the last half cycle of the output being maintained without distortion by the action of circuits FF 1 , FF 2 . An inverter J may be provided. A delay circuit V is included to compensate for the delay introduced by details 7, J. Fig. 3 (not shown), relates to a similar arrangement fed from an anti-phased square wave source. |
