Abstract: A semiconductor-oscillator comprising a logic circuit having at least one active element, the one input of which is connected by means of a resistor with an inverting output and the same input is connected by a capacitor with a non-inverting output.

Abstract: A differential transistor pair has an antiresonant tank connected between collectors. Feedback is achieved using a pair of cross connected zener diodes biased into reverse breakdown. A balanced two-pin version provides paraphase output and an unbalanced single-pin version is available for single phase output. The single pin version can include a current mirror for biasing the zener diodes with constant current. The oscillator can be temperature compensated by means of a temperature programmed current source.

Abstract: An oscillator circuit comprised of three bistable circuits connected in cascade, a circuit for generating first timing signals, and a circuit for generating second timing signals. Output signals from the series of bistable circuits are applied to enable the circuits for generating timing signals, and the timing signals are applied to an input of the series of bistable circuits to change the states of the bistable circuits. After a first time interval has elapsed the first timing signal changes the state of a first bistable circuit which in turn successively changes the states of the other bistable circuits. After a second time interval has elapsed after the changes of state effectuated by the first timing signal, the second timing signal changes the state of the first bistable circuit which in turn successively changes the states of the other bistable circuits, so that the bistable circuits repetitively change state with a period equal to the sum of the first and the second time intervals.

Abstract: An electrical signal generator comprises an electric wave oscillator for producing oscillations at one or other of two predetermined frequencies, an attenuator device for attenuating oscillations produced by the oscillator in a manner which varies over a period of time, and control means for controlling the oscillator to produce a burst of oscillations at one said predetermined frequency and a subsequent burst of oscillations at the other said predetermined frequency. The control means controls the attenuator device increasingly to attenuate the oscillations over the period of each burst.

Abstract: A semiconductor integrated oscillator circuit requiring higher impedances than are practical by integrated circuit technology and generally provided by discrete components external to the circuit are functionally provided in the integrated circuit by a "current mirror" circuit which provides the bias function separate from the signal function.

Abstract: A self-triggered clock pulse generator for high frequencies comprising an oscillating quartz crystal which is included in a loop together with a capacitor and a single, non-inverting gate. An averaging feedback is obtained by means of an inverting gate and an integrating circuit, which are connected in series between the output of the non-inverting gate and the input of the gate which is connected to the crystal.

Abstract: A relaxation oscillator comprising three cascaded operational voltage comparators is described. The on-time of the inventive circuit is established in accordance with a variable input element to the first operational comparator. The off-time is established by an RC network in the input circuit of the second operational comparator. The first and second operational comparators are interconnected so that the turning on or off of the second operational comparator affects the first operational comparator to cause it to also turn on or off.

Abstract: A frequency-voltage converter using a charge-pump element and a pulse generating circuit stabilized in frequency of the output pulse signal by using the frequency-voltage converter for detecting the deviation or variation of the frequency of the output pulse signal.

Abstract: CMOS oscillator in which the oscillator circuit comprises a first MOS transistor connected by its source to a first terminal of a voltage supply and biased by the current provided by a second MOS transistor of opposed type which is a part of the same integrated circuit. At least a third MOS transistor (T.sub.6, T.sub.8, T.sub.12) of the same type as the second and which is a part of the same integrated circuit is provided, the sources and gates of the second and third transistors being respectively connected together and respectively to the second terminal of the voltage supply and to a point (P) at a potential such that the mean drain current of the first transistor will be maintained at a value just higher than the value at which oscillation starts.

Abstract: An integrated circuit relaxation oscillator includes a capacitor, a resistor forming a conductive path for charging the capacitor, a transistor for discharging the capacitor, and a control circuit responsive to the level of charge on the capacitor for controlling the conduction level of the transistor. The control circuit has a relatively high trip point while it is in one state and during the time that the capacitor is being charged, and a relatively low trip point while it is in a second state and during the time that the capacitor is being discharged. The control circuit is balanced, such that variations in process parameters and variations in the voltage level of the power supply do not appreciably affect the period of the oscillatory output signal.

Abstract: A fluid level sensor comprising a novel electronic circuit which monitors change in the fluid level in a reservoir through a conductive probe disposed therein. The probe and a capacitor are electrically connected in a circuit which is intermittently energized to create an electrical transient therein. The transient is monitored, and a warning is given when the transient indicates that the probe is not in contact with the fluid in the reservoir. Two embodiments are disclosed as applied to a vehicle hydraulic brake system having a dual reservoir type master brake cylinder with a probe for each reservoir. In one, only a single capacitor is required since the electronic circuit electrically connects each probe with the capacitor sequentially by means of time multiplexing. In the other, a capacitor is required for each probe and the transients in each capacitor/probe circuit are fed to a logic circuit which determines if any of the probes is out of contact with the fluid in the reservoir.

Abstract: An integrated circuit oscillator includes a timing circuit and a bistable circuit for controlling the timing circuit. The timing circuit includes a capacitor and a pair of field effect transistors (FET), one of which is employed for charging the capacitor and the other of which is employed for discharging the capacitor. A first stage having a relatively low trip voltage is responsive to a low level of charge on the capacitor for actuating the bistable circuit to a first state and a second stage having a relatively high trip voltage is responsive to a high level of charge on the capacitor for actuating the bistable circuit to a second state. The charging and discharging FET's are rendered conductive in response to the first and second states, respectively, of the bistable circuit, such that the capacitor is both charged and discharged over relatively long time periods.

Abstract: A phase control circuit includes an amplifier having a signal combining output, an inverting input signal supplied via a first coupling path with signals to be phase controlled, and a non-inverting input supplied via a second coupling path with such signals, the second coupling path including a reactive element and a variable admittance device. The variable admittance device comprises an operational transconductance amplifier exhibiting a controllable linear transconductance characteristic and an output admittance which varies proportionally to the transconductance in response to applied bias current. Variation of the bias current in a predetermined manner produces a corresponding variation in phase shift imparted to signals provided at the signal combining output.

Abstract: This disclosure relates to a solid-state voltage controlled oscillating circuit arrangement employing a differential type of integrated circuit operational amplifier and a transistorized output amplifier. The operational amplifier includes an inverting input coupled to a source of reference potential and a noninverting input coupled to an input signal source. The operational amplifier is provided with hysteresis for causing a dead band zone to occur until the signal on the noninverting input exceeds a predetermined value so that the operational amplifier toggles and produces output signal pulses having a frequency which is proportional to the amplitude of the input signal applied to the noninverting input. The output signal pulses are amplified by a transistorized output amplifier.

Abstract: A precision crystal-controlled oscillator circuit with provision for separate sinusoidal and square-wave output signals which can be realized as a silicon integrated circuit without the use of external capacitors or resistors is disclosed. Two feedback loops are utilized in addition to the oscillating loop. The first feedback loop maintains the gain of the oscillation loop at substantially unity when the amplitude of the oscillation is at a predetermined level, thereby ensuring both spectral purity and amplitude stability of the sinusoidal output signal. The second feedback loop maintains the duty cycle of the square-wave output signal substantially equal to 50 percent by controlling the circuit operation to equally space the signal zero crossings at the input of the square-wave output stage.

Abstract: The start-up delay of an externally synchronized astable multivibrator is reduced by placing a low impedance path between ground and the base electrode of a transistor in the input circuit to the multivibrator in response to the signal which turns on the multivibrator.

Abstract: A pulse generator which can be applied to a horizontal deflection circuit and/or a vertical deflection circuit of a television set and of which almost all parts can be easily manufactured in a single IC (Integrated Circuit) chip has been found. A capacitor in an integrator circuit is charged and discharged alternately. The voltage across said capacitor and a second voltage, which is controlled by said voltage across said capacitor, are compared with a predetermined voltage. According to the result of the comparison, the capacitor is charged or discharged and, thus, a pulse oscillation is provided.

Abstract: An oscillation system includes a pair of differentially connected oscillator transistors having a resonant tank circuit connected between collector electrodes and a current source transistor connecting both emitter electrodes to ground. The collectors and base electrodes of the oscillator transistors are cross connected to provide regenerative feedback and matched resistors connect each collector to a source of operating potential. A shunt transistor is connected to the collector of one of the oscillator transistors and a series transistor connected to their common emitters. The currents of the shunt and series transistors are combined in a second current source transistor. Control signals applied to the base of the series transistor vary the oscillator current (and thereby its frequency), and produce opposite current changes in the shunt transistor, thus maintaining the DC component of the oscillator output signal at a constant.

Abstract: Disclosed is a circuit for locking a harmonic-rich oscillator, such as the crystal-controlled type, to provide as its output, a signal at a designated frequency characterized by minimum harmonic content and high stability. The circuit includes a combination of gates in the oscillatory feedback path controlled by single-shot multivibrators with time constants such that any tendency of the period of the output signal to compress or expand is overridden by the respective expansion or compression thereof by the appropriate single-shots.

Abstract: Disclosed is a clock signal generating integrated circuit device comprising a quartz crystal oscillator section and a multistage frequency divider section. The crystal oscillator section and each frequency divider stage includes respectively complementary insulated gate field effect transistors. According to the present invention, the high frequency-operated field effect transistors have a lower threshold voltage than the remaining field effect transistors, so that the occupied area of the oscillator section can be decreased and simultaneously the power dissipation can also be reduced.

Abstract: A piezoelectric crystal has an energizing circuit including a low-voltage supply battery connected across two parallel pairs of series-connected field-effect transistors of the insulated-gate type, the junction of each FET pair being tied to a tap of a respective capacitive voltage divider which lies between a reference pole of the battery and a respective terminal of a piezoelectric crystal. Each of these crystal terminals is also connected directly to the gate of the first FET of a respective pair and via a coupling capacitor to the gate of the second FET of the opposite pair, the last-mentioned gate being biased with a potential outside the voltage range of the supply battery.

Abstract: A voltage controlled oscillator circuit comprises a voltage controlled oscillator circuit, first and second constant-current circuits respectively for causing first and second constant currents, current dividing means for dividing the first constant current in accordance with an outside control voltage, and means for adjustably varying the control voltage. The oscillation frequency is controlled responsive to an input control current equal to the sum of one of the divided currents and the second constant current. The adjustment means causes an adjustment of the output currents of the current dividing means and of the free-running oscillation frequency.

Abstract: A voltage controlled sine wave oscillator is provided in which the frequency of the output signal is a linear function of the amplitude of an input control signal. The output signal may be of constant amplitude with changes in frequency, or its amplitude may be a linear function of its frequency. Two-phase quadrature output signals may be provided for multi-phase applications. The oscillator of the invention in the embodiment to be described herein is solid state, and it makes use of operational integrators, analog multipliers, and associated circuitry to generate the outputs.

Abstract: A monolithic integrated quartz crystal oscillator circuit having a resistance between the inverter output and the quartz crystal vibrator in order to stabilize the frequency characteristics thereof. An inverter including complementary coupled N-channel and P-channel MOS field effect transistors, and an output resistance at the drain connected terminals thereof, are monolithically integrated into a single chip. The resistance at the output terminal of the complementary coupled inverter effects a stabilization of the frequency of the quartz crystal oscillator circuit during changes in the supply voltage.