Abstract: The invention relates to direct-fed microbials for use in E. coli, Salmonella, and/or Campylobacter inhibition in animals. More particularly, the invention relates to isolated Bacillus strains A12, 54, 681, 101, 235, and 721, and strains having all of the identifying characteristics of these strains, for a use comprising the above-mentioned use. The invention also relates to the use of isolated Bacillus strains 681,721, A12, 54, 86, 300, 101, 102, 235, and 177, and strains having all of the identifying characteristics of these strains, to prevent or reduce prolapse in an animal.

Abstract: The present invention teaches a power amplifier having two or more output power devices and a combining network for switching the output path between these several power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. Either the first or second output power device is enabled depending on the output power level. A combining network is used to transform the output impedance, as required, for the proper operation of the enabled power device. By switching between a range of power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a power amplifier having two output power devices and a mechanism for switching the output path between these two power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. By switching between the two power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a power amplifier having two or more output power devices and a combining network for switching the output path between these several power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. Either the first or second output power device is enabled depending on the output power level. A combining network is used to transform the output impedance, as required, for the proper operation of the enabled power device. By switching between a range of power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a power amplifier having two output power devices and a mechanism for switching the output path between these two power devices. The first output power device is designed for power efficient signal amplification at the power amplifier's highest output power level. The second output power device is designed for power efficient signal amplification at the output power level that the power amplifier is most likely to operate. By switching between the two power devices according to the output power level, a high level of power efficiency can be achieved across a broad range of operating states of the power amplifier.

Abstract: The present invention teaches a variety of high VSWR mismatch output stages and methods for protecting output stages during high VSWR operation. To accomplish these goals, the present invention teaches absorbing reverse base current arising at the base of the power transistor of the output stage. In one embodiment, a variable impedance device such as a transistor is coupled to the base of the power transistor such that when the base-emitter voltage exceeds a predefined voltage, the variable impedance device goes into a low impedance mode and absorbs a portion of the base current. In another embodiment, feedback control circuitry is incorporated into the output stage bias circuitry in order to control the total base current.