基本信息
摘要：1,070,878. Semi-conductor circuits. TEKTRONIX Inc. Jan. 7, 1966 [Jan. 19, 1965], No. 893/66. Heading H3T. In a pulse delaying circuit, particularly for use in a sampling oscilloscope, a ramp waveform 60 is generated by charging a capacitor 36 which is normally clamped by a gating transistor 18 having an anti-saturation circuit. Trigger pulses are derived at 48 from the Y deflection waveform at 46 and are differentiated at 50 before being used to trigger two tunnel diode bi-stable circuits 54, 26. The output from tunnel diode 26 turns off gating transistor 18 and allows capacitor 36 to charge via a constant current transistor 10 so as to provide a ramp waveform 60. When the ramp voltage 60 exceeds that of a staircase waveform from 64, comparator diode 62 becomes conductive, triggering a further bi-stable tunnel diode 68 the output from which is differentiated at 72 to provide a pulse at 82 which may trigger an avalanche transistor sampling circuit. The constant current via transistor 10 is arranged to arm the tunnel diode 68 so as to improve its triggering stability. The response of the gating transistor 18 is improved by an anti-saturation circuit 40, 28. The circuit is reset after a time, adjustable by switches 38, 86, by a monostable multivibrator 84. The comparison of waveforms 60 and 64 enables different portions of the vertical input signal waveform to be sampled at successive times. The sampled signals are stored and displayed as a lower frequency waveform on a cathode-ray oscilloscope.
摘要附图：
