Abstract: A circuit includes a first transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to an output terminal, and the control terminal coupled to an input terminal, a second transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the second current terminal of the first transistor, a third transistor having a first current terminal, a second current terminal, and a control terminal, the first current terminal coupled to the output terminal, and the control terminal coupled to the second current terminal of the second transistor, and a fourth transistor having a first current terminal and a control terminal, the first current terminal coupled to the second current terminal of the second transistor, and the control terminal coupled to the second current terminal of the third transistor.

Abstract: A buffer circuit includes a first transistor, a second transistor, and a third transistor. The first transistor includes a first current terminal, a second current terminal, and a control terminal. The first current terminal is coupled to a load terminal. The control terminal is coupled to a preamplifier input terminal. The second transistor includes a first current terminal and a second current terminal. The first current terminal of the second transistor is coupled to the second current terminal of the first transistor. The third transistor includes a first current terminal, a second current terminal, and a control terminal. The first current terminal of the third transistor is coupled to the load terminal. The second current terminal of the third transistor is coupled to a ground terminal. The control terminal of the third transistor is coupled to second current terminal of the second transistor.

Abstract: A buffer circuit includes a first transistor, a second transistor, and a third transistor. The first transistor includes a first current terminal, a second current terminal, and a control terminal. The first current terminal is coupled to a load terminal. The control terminal is coupled to a preamplifier input terminal. The second transistor includes a first current terminal and a second current terminal. The first current terminal of the second transistor is coupled to the second current terminal of the first transistor. The third transistor includes a first current terminal, a second current terminal, and a control terminal. The first current terminal of the third transistor is coupled to the load terminal. The second current terminal of the third transistor is coupled to a ground terminal. The control terminal of the third transistor is coupled to second current terminal of the second transistor.

Abstract: Techniques to improve efficiencies of power amplifiers in wireless communication devices are described herein. In one embodiment, an envelope tracking supply modulator includes a pre-amplifier having an input coupled to an envelope signal and another input coupled to a threshold voltage signal, a de-multiplexer coupled to an output of the pre-amplifier, a pulse frequency modulator having an input coupled to an output of the de-multiplexer, and a pulse width modulator having an input coupled to the output of the de-multiplexer. The de-multiplexer is configured to allow the pulse frequency modulator to modulate a switching frequency to generate a switched signal according to a slew rate of the envelope signal or allow the pulse width modulator to provide the switched signal as a current source with a constant frequency, based on a comparison result between the envelope signal and the threshold voltage signal at the pre-amplifier.

Abstract: An on-chip power management system includes one or more processing cores and one or more switched capacitor voltage regulators, each supplying power at an output voltage to one of the cores. One or more flying capacitors supply the power at a supply voltage to each of the switched capacitor voltage regulators. A flying capacitor controller allocates each of the flying capacitors to the switched capacitor voltage regulators.

Abstract: Techniques to improve efficiencies of power amplifiers in wireless communication devices are described herein. In one embodiment, an envelope tracking supply modulator includes a pre-amplifier having an input coupled to an envelope signal and another input coupled to a threshold voltage signal, a de-multiplexer coupled to an output of the pre-amplifier, a pulse frequency modulator having an input coupled to an output of the de-multiplexer, and a pulse width modulator having an input coupled to the output of the de-multiplexer. The de-multiplexer is configured to allow the pulse frequency modulator to modulate a switching frequency to generate a switched signal according to a slew rate of the envelope signal or allow the pulse width modulator to provide the switched signal as a current source with a constant frequency, based on a comparison result between the envelope signal and the threshold voltage signal at the pre-amplifier.

Abstract: The present invention provides for a zinc-based negative electrode (i.e., anode) for an alkaline electrochemical cell. The negative electrode comprises zinc powder suspended in a gelling agent. The zinc powder has an average particle size substantially greater than 25 micrometers, and preferably has an average particle size of 150 micrometers or smaller. The zinc powder has less than 1 weight percent zinc dust of a particle size less than 25 micrometers. The cell achieves enhanced cell discharge performance at high rate discharge, while minimizing gassing.

Abstract: The present invention provides for a zinc-based negative electrode (i.e., anode) for an alkaline electrochemical cell. The negative electrode comprises zinc powder suspended in a gelling agent. The zinc powder has an average particle size substantially greater than 25 micrometers, and preferably has an average particle size of 150 micrometers or smaller. The zinc powder has less than 1 weight percent zinc dust of a particle size less than 25 micrometers. The cell achieves enhanced cell discharge performance at high rate discharge, while minimizing gassing.