Tektronix, Inc.

Wayne D Thomas

Gordon W Meigs

Eugene J Climer

Richard L Compton

A hybrid R-C component for use in oscilloscope probes of the type having a resistive element disposed on a first surface of a substrate, and having a first conductive coating disposed on a second surface of the substrate, and having a dielectric layer disposed over the first conductive coating, a second conductive coating partially disposed over a first portion of the substrate and in contact with a first end of the resistive element and with a region of the second conductive coating being partially disposed over the dielectric layer and forming a first capacitor plate, a third conductive coating disposed over a second portion of the substrate and in contact with a second end of the resistive element and with a region of the third conductive coating being partially disposed over the dielectric layer and forming a second capacitor plate, whereby the first capacitor plate and a first area of the first conductive coating in conjunction with the dielectric layer form a first capacitor C1 and the second capacitor plate and a second area of the first conductive coating in conjunction with the dielectric layer form a second capacitor C2 in series with the first capacitor and the resistive element implements a resistor in parallel with the series capacitors C1 and C2, is improved by the addition of a second dielectric layer disposed over those portions of the first and second capacitor plates that are proximate to each other. In an preferred embodiment, a portion of each of the first and second capacitor plates that is farthest from where they are proximate to each other is not covered by the second dielectric layer and is therefore available as a trim area for adjusting the values of the first and second capacitors.

Hybrid R-C component having an overlying dielectric layer

A regulated high voltage supply derives two regulated high voltages from a single winding of a transformer. The higher voltage supply is primary side pass regulated, and the lower voltage supply is secondary side offset regulated. The two regulating circuits for the two regulated high voltage supplies interact with each other to correct an error in either high voltage supply.

Regulated high voltage supply

An amplifier includes a network which generates additional output current for driving a substantially capacitive load as the frequency of an input signal is increased. The network comprises a plurality of rate discriminators which activate additional current sources at predetermined frequencies.

Amplifier having a high frequency boost network

A pulse peak detector for producing a D.C. voltage level corresponding to the peak amplitude of an input signal. A differential comparator is utilized to compare the input signal to the output level, and to activate a control circuit when the peak amplitude of such input signal exceeds the output voltage. The control circuit includes a current source which operates for a predetermined resettable time interval to provide a charging current path for a storage capacitor. An emitter follower is disposed between the storage capacitor and the system output to isolate the capacitor from any output loading. For short-duration repetitive input pulses, for example, 10 nanoseconds or less, a latch circuit insures activation of the timing circuit.

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Tigard, OR, United States of America

Wayne D Thomas