High duty-cycle sweep generator for a cathode ray oscilloscope
AssigneeTexaco Inc.
InventorLloyd E. Elliott, Jr.
Life of this patent
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Abstract
A sweep generator circuit for use with a cathode ray oscilloscope. It provides for a high duty-cycle by eliminating the discharge and recovery time of a conventional sweep generator circuit. This is accomplished by alternately charging and discharging the timing capacitor at equal rates, forming linear up and down ramp signals. Then, by amplifying the ramp signals along with synchronously reversing the polarity of the amplified down ramp signals, using electronic switching, identical unidirectional sweeps are produced during both charging and discharging times of the timing capacitor.
Claims8
High duty-cycle sweep generator for a cathode ray oscilloscope, comprising
- an integrator including a timing capacitor and means for charging and discharging said timing capacitor at the same rate to provide linear ramp signals,
- means for amplifying said linear ramp signals, and
- means for reversing the polarity of alternate ones of said amplified linear ramp signals without delay to provide a sweep signal which eliminates any recovery time for said timing capacitor.
High duty-cycle sweep generator for a cathode ray oscilloscope, comprising
- an integrator including a timing capacitor,
- first circuit means for supplying a positive voltage to said integrator,
- second circuit means for supplying a negative voltage to said integrator,
- first electronic switch means connected to said first circuit means for timing the application of said positive voltage to said integrator,
- second electronic switch means connected to said second circuit means for timing the application of said negative voltage to said integrator,
- a resistor connected to said timing capacitor for charging and discharging said capacitor at linear rates to provide linear ramp signals,
- means for inverting and amplifying said ramp signals,
- third circuit means including a third electronic switch and a unitary gain amplifier for selectively passing said inverted and amplified ramp signal,
- fourth circuit means including a fourth electronic switch and a unitary gain inverting amplifier for selectively inverting and passing said inverted and amplified ramp signal,
- a sweep signal circuit for alternately receiving said inverted and amplified and said reinverted and amplified ramp signals, and
- fifth circuit means for alternatively actuating said third or said fourth electronic switches synchronously with said second or said first electronic switch means respectively to provide a sweep signal having zero recovery time for said timing capacitor.
Dependencies are inferred from the claim text.