Patent
High frequency power amplifier circuit
TLDR
In this article, a bias circuit that generates gate bias voltages by resistance dividers creates a problem in that the values of the resistances constituting the bias circuit must be finely adjusted, and accordingly extra trimming tasks are required.Abstract:
A module including a bias circuit that generates gate bias voltages by resistance dividers creates a problem in that the values of the resistances constituting the bias circuit must be finely adjusted, and accordingly extra trimming tasks are required. The present invention provides current generators that generate currents varying with desired characteristics responsive to a control voltage, independent of variations in transistor threshold voltages, connects output resistors to parallel transistors in respective stages to form current mirror circuits, and supplies currents from the current generators thereto to drive them, instead of supplying dividing voltages.read more
Citations
More filters
Patent
Charge pump based power amplifier envelope power supply and bias power supply
TL;DR: In this paper, a direct current (DC)-DC converter, which includes a charge pump-based radio frequency (RF) power amplifier (PA) envelope power supply and a PA bias power supply, is described.
Patent
Power amplifier module
TL;DR: A power amplifier module comprises a plurality of amplifier stages, each including a reference amplifier for emulating the operation of the amplifier as mentioned in this paper, and the current flowing to the base of a bipolar transistor that forms each reference amplifier depending on an input power level is detected, amplified, and supplied as base current of the transistor of the corresponding amplifier.
Patent
Envelope power supply calibration of a multi-mode radio frequency power amplifier
TL;DR: In this paper, an envelope power supply calibration of a multi-mode RF power amplifier (PA) was proposed to ensure adequate headroom when operating using one of multiple communications modes. But, the power supply was not restricted to provide a minimum allowable magnitude based on an RF signal level of the PA.
Patent
High-frequency amplifier
Shintaro Shinjo,Kazutomi Mori,H. Joba,Hiroaki Nagano,Mitsuru Motizuki,Yukio Ikeda,Noriharu Suematsu +6 more
TL;DR: In this article, a high-frequency amplifying section (2) amplifies an input highfrequency signal with transistors (12-1) to 12-N to suppress a sudden gain variation with a change in the amplitude of the input high frequency signal.
Patent
PA envelope power supply undershoot compensation
Hirofumi Honjo,Brian Baxter,Stuart Williams,Roman Zbigniew Arkiszewski,David E. Jones,Chris Levesque,William David Southcombe,Scott Yoder,Terry J. Stockert +8 more
TL;DR: In this article, a step change from a high magnitude to a low magnitude that exceeds the step change limit is considered, which may cause the PA envelope power supply to undershoot.
References
More filters
Patent
High frequency power amplifier and wireless communication module
Satoshi Arai,Tsuyoshi Shibuya,Hitoshi Sekiguchi,Nobuhiro Matsudaira,Tomio Furuya,Masashi Maruyama,Yasushi Ohyama +6 more
TL;DR: In this article, a high frequency power amplifier with a bias voltage generating circuit is presented, which outputs a signal having a level corresponding to an output level required under control of a power supply voltage for each output power FET, based on a control signal for the output level.
Patent
Power amplifier module
TL;DR: A power amplifier module comprises a plurality of amplifier stages, each including a reference amplifier for emulating the operation of the amplifier as mentioned in this paper, and the current flowing to the base of a bipolar transistor that forms each reference amplifier depending on an input power level is detected, amplified, and supplied as base current of the transistor of the corresponding amplifier.
Patent
Radio telephone using received signal strength in controlling transmission power
TL;DR: In this paper, a radio telephone uses a signal indicating the strength of received communication signals as a measure of prevailing signal propagation conditions to control the gain of a power amplifier in its transmitter.
Patent
Temperature compensated power amplifier power control
Carlos Gamero,Ryan Bosley +1 more
TL;DR: In this article, the authors proposed a temperature compensation method for a power amplifier by varying a supply voltage applied to the power amplifier to compensate for changes in the operating temperature of the amplifier.