Abstract: Various techniques are described to level shift an input signal from an input node to an output node of an open-loop voltage buffer circuit so that a DC offset voltage and a temperature-dependent voltage from the level shifter circuitry are mutually canceled out. By using these techniques, the output voltage of the buffer circuit tracks the input voltage with no DC offset voltage and no temperature drift.

Abstract: A capacitive load, an inductive load, or a transmission line coupled to an output of a closed-loop amplifier circuit can cause undesirable oscillations in a feedback signal of the amplifier circuit. The oscillations in the feedback signal can cause the amplifier circuit to exhibit instability and unpredictable behavior. Techniques are described that allow an amplifier circuit to provide a stable response while driving a capacitive load.

Abstract: Apparatus for portable rainwater harvesting system which consists of a closed container of indeterminate size with removably sealable openings which allow for entrapment and containment of precipitation, and/or an intermediate system which may or may not connect to a catchment system. The container may have an opening near the top as an entry point for the collected rainwater and an opening with valve assembly at or near the bottom for controllably dispensing the collected rainwater. Alternately, the container may have individual openings allowing for attachment of individual collectors without intermediate device. The container may also have openings for attachment of additional containers intended to increase the overall storage capacity of the system. The intermediate device may be articulating in nature to allow the system to be used in a plurality of orientations and the catchment mechanism may be of variable size and geometry facilitating ease of attachment and ease of storage when not in use.

Abstract: A system and method for effecting wideband image rejection. In a receiver implementation, the inventive method includes the steps of receiving a first signal in a first frequency band and generating in-phase and quadrature signals therefrom. The phase of the in-phase signal is shifted to provide a second signal and the phase of the quadrature signal is shifted to provide a third signal. A predetermined phase relationship is thereby effected between the second and the third signals. The second and third signals are then summed to provide an output signal which has minimal interference from a mixing signal. In an illustrative receiver application, the phase shifting is achieved via the use of all pass networks. Each of the all pass networks include a differential amplifier having first and second input terminals. The first and the second terminals are connected to a first end of first and second resistive elements, respectively.

Abstract: A system and method for effecting wideband image rejection. In a receiver implementation, the inventive method includes the steps of receiving a first signal in a first frequency band and generating in-phase and quadrature signals therefrom. The phase of the in-phase signal is shifted to provide a second signal and the phase of the quadrature signal is shifted to provide a third signal. A predetermined phase relationship is thereby effected between the second and the third signals. The second and third signals are then summed to provide an output signal which has minimal interference from a mixing signal. In an illustrative receiver application, the phase shifting is achieved via the use of all pass networks. Each of the all pass networks include a differential amplifier having first and second input terminals. The first and the second terminals are connected to a first end of first and second resistive elements, respectively.