Abstract: A programmable trigger coupling circuit and trigger circuit for selecting DC and AC coupling modes in addition to a few other coupling modes without using a DC blocking capacitor in series with the signal path. A short high frequency signal path, low pass filter network and a subtraction circuit are used for obtaining the basic trigger coupling modes. Additional circuits may be used for expanded coupling modes and functions.

Abstract: A trigger circuit including arm and trigger comparators which are responsive to the push-pull output from a differential amplifier but insensitive to its common mode component. A controllable hysteresis insertion circuit is also included in the circuit for noise rejection and sensitivity control purposes.

Abstract: A current-limiting circuit for a differential amplifier includes a voltage generator which is switched in parallel with a signal-current-generating impedance connected between the emitters of the differential amplifier transistors whenever an input signal exceeds the voltage of the voltage generator. A practical embodiment for limiting the current in either direction for opposite-polarity input signals includes a pair of voltage generators cross-coupled from a respective differential amplifier transistor base to the opposite transistor emitter via transistor switches.

Abstract: An improved bootstrapped shunt feedback amplifier is provided in which a minimum number of transistors are arranged to provide a higher slew rate of output voltage at lower power, while minimizing distortion and thus providing a more precise signal replication. Features include the use of three-terminal composite transistors to increase bandwidth and bootstrapping to improve amplifier response while reducing voltage stress on the active devices.

Abstract: A feedback amplifier is provided with a voltage-controlled compensation circuit which varies the effective feedback capacitance by controlling a proportional amount of feedback current returned via the capacitor to the amplifier summing node. The proportionality and current steering of the feedback current is effected by a multiplier circuit, the bias of which is controlled by an adjustable DC voltage. Several feedback amplifier configurations are shown herein, exemplifying the versatility of the compensation circuit of the present invention.

Abstract: A buffer amplifier circuit is provided in which the effects of power supply noise is substantially reduced while contemporaneously exhibiting the attributes of low thermal distortion and high linearity. The amplifier comprises a source follower input stage which contains additional devices to absorb power supply variations, and an emitter follower output stage. A constant-current bias network includes means for bootstrapping the gate-to-drain capacitance of the input source follower.

Abstract: A linear wideband differential amplifier includes a variable gain stage comprising two cross-coupled differential amplifiers and differential current source to compensate for thermal distortion, to minimize transient response distortion, and to eliminate signal attenuation at the center gain setting.

Abstract: The cascode feed forward amplifier is modified to correct alpha-induced error. A pair of resistors are serially disposed between the bases of a pair of common-base amplifiers to generate an error voltage proportional to the input signal. The error voltage is applied to the correction amplifier to provide an appropriate correction current.