Topic
Output impedance
About: Output impedance is a research topic. Over the lifetime, 11185 publications have been published within this topic receiving 134949 citations.
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Patent•
12 Mar 2013
TL;DR: A scalable periphery tunable matching power amplifier is presented in this article, which allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss.
Abstract: A scalable periphery tunable matching power amplifier is presented. Varying power levels can be accommodated by selectively activating or deactivating unit cells of which the scalable periphery tunable matching power amplifier is comprised. Tunable matching allows individual unit cells to see a constant output impedance, reducing need for transforming a low impedance up to a system impedance and attendant power loss. The scalable periphery tunable matching power amplifier can also be tuned for different operating conditions such as different frequencies of operation or different modes.
77 citations
TL;DR: In this paper, an implementation of an ERT system with a voltage source and current sensing to overcome the limits of the current source is presented, where a logarithmic amplifier is used to compress the signal.
77 citations
TL;DR: In this paper, the stray impedance is minimized by using a triaxial power feedthrough and electrode shield configuration, and the remaining impedance is characterized using a two-port circuit model to represent the impedance between the voltage and current probes and the electrode.
Abstract: Impedance measurement of rf glow discharges is a convenient diagnostic tool that can be used to estimate specific discharge properties based on a simple electrical analog model. Accurate measurements require minimization and characterization of stray impedance. In this study, the stray impedance is minimized by using a triaxial power feedthrough and electrode shield configuration. The remaining stray impedance is characterized using a two‐port circuit model to represent the impedance between the voltage and current probes and the electrode. The two‐port parameters are determined by unterminating [R. F. Bauer and P. Penfield, Jr., IEEE Transactions on Microwave Theory and Techniques MTT‐22, 282 (1974)] the network, which involves measuring the impedance of the reactor system with three or more known impedances inserted between the electrodes. Based on voltage and current measurement, the discharge impedance can then be determined during discharge operation. Impedance measurements and property estimations a...
77 citations
Patent•
13 Sep 1991
TL;DR: In this paper, an impedance matched class-F high frequency amplifier includes an input matching circuit receiving high frequency signals connected to the gate of the FET, and the output of the output matching circuit is connected to an even harmonic terminating circuit.
Abstract: An impedance matched class-F high frequency amplifier includes an input matching circuit receiving high frequency signals connected to the gate of the FET. The drain of the FET is connected to an output matching circuit which matches the fundamental frequency and the second harmonic frequency, and the output of the output matching circuit is connected to an even harmonic terminating circuit. The stray reactance componance at the output impedance of the FET is offset by the output matching circuit, and therefore the even harmonics terminating circuit can more accurately terminate the second harmonic frequencies.
77 citations
TL;DR: In this paper, a simple and successful design for matching complex impedance loads with different values at two different frequencies is presented, and the explicit closed-form equations for the transformer parameters are derived analytically.
Abstract: A simple and successful design for matching complex impedance loads with different values at two different frequencies is presented. The explicit closed-form equations for the transformer parameters are derived analytically. The validity of the proposed design is verified by a numerical example of designing the input matching network of an amplifier.
77 citations