Abstract: A temperature compensated, phase tolerant sense amplifier for use in a magnetic bubble memory system in which current is applied to the detector resistors only during a bubble detect operation.

Abstract: A bandgap voltage reference source is provided which is temperature stable or temperature controlled and can be made by standard CMOS process. The reference has two substrate bipolar transistors with the emitter current density of one of the transistors being larger than the emitter current density of the other transistor. The transistors are used as emitter followers having resistors in their emitter circuits from which an error voltage is obtained. The error voltage is amplified through a differential or operational amplifier. Through the amplifier or through a resistor network, an output voltage higher or lower, respectively, than the bandgap voltage can be obtained. The output voltage can be made to have a positive, negative, or zero temperature coefficient.

Abstract: A symmetrical amplifier comprising two transistors having their emitters connected to ground via two resistors of equal value. An input signal is applied between the bases of the transistors and an output signal is available at the collectors of the transistors. This amplifier will provide improved linearity up to an input voltage of 200 mV if, for the emitter resistor, the relationship R.apprxeq.0.56 U.sub.T /I.sub.CO is satisfied, U.sub.T being the thermal voltage and I.sub.CO the collector quiescent current. The value of this resistor is very small so that the slope is reduced only slightly by the emitter resistors and the sensitivity of the circuit is hardly affected thereby.

Abstract: A temperature compensated, phase tolerant sense amplifier for use in a magnetic bubble memory system in which current is applied to the detector resistors only during a bubble detect operation.

Abstract: A temperature-compensated amplifier circuit including an amplifier section having first and second transistors which are connected at their collectors to a power source terminal through first and second resistors, and having d.c. biased bases coupled to signal source terminals; a current source including a third transistor having a collector coupled with the emitters of the first and second transistors and a grounded emitter; a fourth transistor having an emitter coupled with the power source terminal through a third resistor; a fifth transistor connected at the emitter to the power source terminal and at the base to the base of the fourth transistor; a sixth transistor having both base and collector commonly coupled to the collector of the fourth transistor and grounded at the emitter; and a seventh transistor connected at the collector to the base and the collector of the fifth transistor, at the base to the bases of the third and sixth transistors and grounded at the emitter.

Abstract: A thermal drift compensation circuit for operational amplifiers wherein a second operational amplifier is utilized to sense the error voltage between the input terminals of a first operational amplifier and generate a current therefor which compensates for errors resulting from thermal effects within the first operational amplifier.

Abstract: An amplifier circuit is disclosed which includes a current supply circuit having a field effect transistor and negative feedback for degenerating the magnitude of the current supplied thereby. The negative feedback can be provided by a diffused resistor connected between the gate and source electrodes of the current supply field effect transistor. A differential amplifier which includes a pair of differentially coupled amplifying field effect transistors is coupled to the current supply circuit. The negative feedback enables the current supply device to provide a current which compensates the differentially coupled field effect transistors over processing while not deleteriously affecting the temperature characteristics thereof. A bipolar diode and a bipolar transistor can be included in the current supply for enabling the resistor to take up less chip area and for allowing more flexibility in the design of the geometry of the current supply, field effect transistor.

Abstract: The emitter-to-base potential of a first transistor operated at predetermined current level is scaled up and applied as the emitter-to-base potential of a second transistor. The resulting collector current of the second transistor decreases with increasing temperature and is differentially compared against a current of opposing polarity to obtain an output current which changes polarity at a given temperature.

Abstract: An emitter-coupled differential comparator compares a horizontal rate ramp signal with a vertical-frequency parabola in a television context for producing horizontal rate pulses duration-modulated at the vertical rate. The comparator is arranged to compensate for a temperature-dependent differential-mode component of the signal sources. The compensation is provided by a temperature-responsive element coupled in the emitter circuit of one of the emitter coupled transistors.

Abstract: A semiconductor device which comprises a first current path formed of a first load, an n number of first transistors, each of whose bases is supplied with an input signal, a second transistor whose base is connected to a first bias power source, and an emitter resistor of said second transistor all connected in series between power supply terminals; and a second current path formed of a second load, a third transistor whose base is connected to a second bias power source through a base resistor, and an emitter resistor of the third transistor all connected in series between the power supply terminals, and wherein the resistance of the base resistor is chosen to be n times as large as that of the emitter resistor of the third transistor, thereby equalizing the amounts of current running through the first and second current paths.

Abstract: A transistor circuit having a plurality of constant current sources wherein a compensating resistor of a predetermined value is inserted between the base of the transistor of one of the constant current sources and a reference voltage supply terminal. The compensating resistor serves to equalize the current variation between currents flowing through first and second resistive loads and thereby equalizes D.C. circuit output potentials for the circuits being driven by the constant current sources. This equalization is achieved irrespective of variations in transistor current gain due to temperature fluctuation or manufacturing error.

Abstract: The collector currents of first and second junction transistors which have base electrodes biased at the same quiescent potential and have emitter electrodes connected via respective emitter degeneration resistances to a common point, are adjusted relative to each other. This is done by applying linearly temperature-dependent voltages in adjustable ratio with each other to the emitter degeneration resistances. This makes it so that the adjustment of the relative values of the collector currents is substantially unchanging over a temperature range.