Abstract: An improved temperature sensing circuit as disclosed in which the voltage drop across a thermistor is compared to the voltage drop across a capacitor to produce a linear output proportional to temperature.

Abstract: A pulse signal amplifier is disclosed which includes at least an emitter follower type drive stage consisting of a pair of complementary transistors and a field effect transistor connected to the drive stage and ON/OFF controlled thereby. A capacitive element is connected between the collectors of the complementary transistors and a pulse current signal source is provided to supply a charge current to the capacitive element and a drive current to the complementary transistors.

Abstract: Input variables are varied cyclically and sequentially in the same direction until the sign of the differential quotient of the magnitude of the error with respect to time changes.

Abstract: A touch control switch suitable for connection between a lamp load and a supply circuit in a lighting installation for alternating current and comprising a semiconductor switching element with a gate electrode, a counting circuit with a forward stepping input and a digital control output connected to the gate electrode of the semiconductor switching element via a trigger pulse generating circuit for controlling the conduction of the semiconductor switching element in dependence on the condition of activation of the digital control output, and a control pulse shaping circuit having an output connected to the forward stepping input of the counting circuit and a first and second input terminal for connection respectively to a first and second terminal of the supply circuit via a touch sensitive impedance. The control pulse shaping circuit comprises a clipper stage with a clipping level controlled by a first voltage-level detector circuit.

Abstract: A voltage reference circuit that can use the parasitic bipolar transistors formed by the drain regions, p-well and monolithic substrate of CMOS integrated circuits.First and second common-collector amplifier transistors are arranged to maintain their base-emitter junction current densities in a prescribed ratio. The difference in current density creates a difference in base-emitter potential used to generate a current having a positive temperature coefficient. This current conducted in a resistor connected to the emitter of the first transistor generates a potential having a positive temperature coefficient. The potential across the first resistor in the emitter circuit of the first transistor is summed with the base-emitter potential of the first transistor producing a reference voltage substantially independent of temperature.

Abstract: A current isolation circuit converts a pulse width modulated input signal to an isolated DC output current whose magnitude is a function of the duty cycle of the input signal. The isolation circuit includes an optical isolator which receives the pulse width modulated input signal and has an output which changes between a conductive and a non-conductive state in response to the input signal. A voltage regulating diode, such as a Zener diode, is connected to the output of the optical isolator and to an isolated power supply so that the voltage across the Zener diode varies between two known voltage values in response to the switching of the optical isolator output between conductive and non-conductive states. A signal derived from the Zener diode is filtered to produce a reference signal with a magnitude which is a function of the duty cycle of the input signal.

Abstract: A signal switch circuit which comprises a first emitter follower transistor supplied with an input signal of a first channel, and a second emitter follower transistor supplied an input signal of a second channel. The collectors of the first and second emitter follower transistors are connected to a positive power source through first and second switch circuits. The first and second switch circuits are established or interrupted in accordance with the D.C. level of a control potential. The first and second emitter follower transistors produce an output signal corresponding to any of the input signals, according as the first and second switch circuits are established or interrupted.

Abstract: A junction FET switching circuit and method in which the gate-source voltage of the switching FET is varied with changing temperature so as to maintain the FET channel resistance substantially constant over a selected temperature range. An offset is introduced to the gate-source voltage to permit adequate voltage variation over the temperature range.

Abstract: A power-on-reset circuit with power fail detection, comprises a supply voltage V, and a voltage divider comprising two series resistors connected between V and the ground. The junction between the two resistors is connected to the (+) terminal of a voltage comparator. The junction is also connected through a diode to the (-) terminal of the comparator. The (-) terminal is also connected to ground through a capacitor and resistor in parallel. A resistor and compacitor in series are connected between V and ground and the junction between the resistor and the capacitor is connected to the output of the comparator, and also to the input of an inverting gate. The output of the inverting gate is the power-on-reset terminal.

Abstract: A switching circuit having two complementary transistors of collector coupling type, a drive transistor, a current backflow-preventing diode and a level-shifting power source. When the drive transistor is on, one complementary transistor is turned off by the level-shifting power source. When the drive transistor is off, the other complementary transistor is turned off by the current backflow-preventing diode. It is sufficient that the drive transistor can switch a current which corresponds to the sum of the base currents of the complementary transistors.

Abstract: A detecting capacitive structure undergoes changes in capacitance value depending upon whether it is detecting, in the sheet transport path of a printing machine, a normal or single sheet, an absent sheet, or a double or stuck-together sheet, so that corrective action can be initiated, such as the skipping of a printing cycle. The detecting capacitive structure and also a reference capacitive structure constitute the capacitances of two RC circuit stages to which an input signal is applied and then removed. The variations with respect to time of the output signals from the two RC circuit stages are then compared, both during application of the input signal and subsequent to removal of the input signal. This comparison of time responses of the two RC circuit stages serves as the basis of the detection.

Abstract: An electronic switching circuit is provided for controlling transfer of electrical power from an alternating polarity electrical power supply to a load means through use of a field-effect transistor device as the primary power controlling element.

Abstract: An electronic switching circuit is provided for controlling transfer of electrical power from an alternating polarity electrical power supply to a load means through use of a field-effect transistor device as the primary power controlling element.

Abstract: An electronic switching circuit is provided for controlling transfer of electrical power from an alternating polarity electrical power supply to a load means through use of a field-effect transistor device as the primary power controlling element.

Abstract: A current driver circuit using a two-level current source for switching PIN diodes. The driver is responsive to a binary signal control voltage for providing a respective forward-bias current or reverse-bias voltage. The two-level current source, responsive to output voltage, is included in the driver circuit to supply one of two current levels when the driver is conditioned to forward-bias the diode. When the output voltage is below a predetermined threshold value, a first level of current is supplied; when the output voltage is above the predetermined value, a second level of current, generally larger than the first current, is provided. The disclosed technique reduces peak instantaneous power dissipation in the driver by avoiding the simultaneous condition of high voltage and high current.

Abstract: The invention relates to an analog computing device for converting a signal x to a different power with a selectable exponent. First and second RC type time dependent transfer elements, having the functions f.sub.1 and f.sub.2 =f.sub.1.sup.b are driven by a square wave generator. The output of the first transfer element is connected to the first input of a comparator and the second input of the comparator is supplied with the signal x of which the power is to be raised to the exponent b. An instantaneous value of the output signal of the second transfer element is scanned and held by a scanning and holding latch which is triggered by the output signal of the comparator which occurs when the signal x and the output signal of the first transfer element are equal.

Abstract: A current source circuit particularly adapted for use with an analog-to-digital converter having automatic scale adjustment. A first current source produces a fixed reference current of a first value in accordance with the scale adjustment while a second current source produces a second current of which the value is controlled by the output of a differential amplifier coupled to the control input of the second current source. A detector circuit is provided for determining the difference between the second current value and the reference value. The detected difference value is fed back to a control input of the amplifier to make the second current value equal to the reference value by reducing the difference.

Abstract: A CMOS logic circuit having a basic CMOS shift register useful as a shift register or in sequential logic circuits is provided. The circuit has two inverters plus an output inverter and two transistors which are enabled by a clock signal to couple the inverters together. The use of a single input clock signal along with the reduced number of transistors is achieved by proper selection of threshold voltages of the transistors.

Abstract: This relates to a circuit for delivering a linear voltage (V.sub.P) which is inversely proportional to the capacitance of a pressure sensitive capacitive transducer. A constant current I.sub.O is alternately switched into a reference capacitor (C.sub.R) and the transducer capacitor (C.sub.P). When the voltage across C.sub.P reaches V.sub.P, a flip-flop is toggled to direct current to C.sub.R. When the voltage across C.sub.R reaches a reference voltage (V.sub.R), the flip-flop is again toggled directing current to C.sub.P. A duty cycle detector charges integrator capacitors until the feedback voltage V.sub.P is such as to render equal the charging times of C.sub.P and C.sub.R.

Abstract: An electronic circuit adapted to multiply/divide analog input signals, such circuit having a first set of four transistors with serially coupled base-emitter junctions arranged to produce an output current in the collector electrode of one of such transistors which is proportional to the product of currents fed into the collector electrodes of a second and third ones of the four transistors divided by current fed into the collector electrode of a fourth one of the transistors. The circuit includes a second set of four transistors, each one having a base electrode and an emitter electrode connected to the base electrode and emitter electrode, respectively, of a corresponding one of the first set of transistors to produce a current in the collector electrode thereof related to the current flow through the ohmic emitter resistance of the corresponding one of the transistors in the first set coupled thereto.