Abstract: A unitary component operating as a low noise amplifier incorporates several other tuning components in conjunction with an FET. By adjusting the tuning components, the overall amplification and impedance characteristics of the unit can be standardized in spite of typical variations in impedance and amplifying characteristics of the FET by itself. The incorporation of such a drop-in module in a microwave circuit, simplifies testing and repair of the remaining portions of the circuit, since the drop-in modules can easily be tested and adjusted for proper operation in a test jig separate from the actual operating circuit.

Abstract: An amplifier circuit using MOS transistors. The load to be connected to an amplifying element of the amplifier circuit is formed by a C-MOS transistor having a P-MOS transistor and an N-MOS transistor.

Abstract: There is disclosed a feedforward system which reduces the phase and amplitude equalizer circuits necessary to provide for circuit operation. The main and error amplifiers of a phase adjusted feedforward system are constructed to have essentially equivalent delay and gain characteristics. The two loops formed by the main and error amplifiers are then phase and amplitude equalized by use of one phase/amplitude equalizer in the small signal loop between the output coupler and the hybrid junction. The circuit may be implemented with less complex structure, thereby resulting in additional circuit simplification and less cost.

Abstract: A switched capacitor amplifier includes an operational amplifier with an inverting input terminal, a non-inverting input terminal, a bias current input terminal, and an output terminal. Current generating means responsive to a pulse train is utilized to provide the high bias current only at the beginning of each pulse cycle to the bias current input terminal of the operational amplifier.

Abstract: A temperature stabilized amplifier is disclosed in the preferred and illustrated embodiment. This amplifier must perform in spite of extreme temperature fluctuations encountered in down hole tools. It must provide an output signal which is a large voltage swing input to a cable suspending the amplifier and other apparatus in a well bore. The apparatus utilizes complementary symmetry VMOS output transistors with a third VMOS transistor supported on a common heat sink with one of the two output transistors. The third transistor, in conjunction with an inverting amplifier, forms a bias which is applied to the output transistors in a manner such that temperature drift is cancelled. This, then, overcomes temperature drift. This extends the operating range of the equipment markedly.

Abstract: Circuit for the load-proportional adjustment of the driving current of a single-ended output transistor of a transistor amplifier for a variable load of the output transistor, the output transistor having a base-emitter voltage and being operated in a common emitter circuit, having a control branch feeding the driving current to the output transistor, including a sensing transistor stage having an output circuit and being driven by the base-emitter voltage of the output transistor, a transistor serving as a driver transistor for the output transistor and being controlled by the control branch, and a coupling circuit through which current in the output circuit of the sensing transistor is feedable to the transistor serving as a driver transistor.

Abstract: Gain peaking and attenuation of audio signals above the peak gain frequency are provided in an audio frequency equalization preamplifier that includes an operational amplifier having a feedback network including first and second resistors and a feedback capacitor connected between the output and the second feedback resistor. Two or three low pass RC filter sections are connected between the audio signal source and the noninverting input of the operational amplifier with a circuit connecting a capacitor of the second RC section from the noninverting input to a node between the second feedback resistor and the feedback capacitor.