Abstract:
A structure having: a plurality of field effect transistors (FETs) connected between a common input and a common output, each one of the field effect transistors comprises: a source region, a drain region, and a gate electrode for controlling carriers through a channel region of a transistor region of the structure between the source region and the drain region; a plurality of diodes, each one of the diodes being associated with a corresponding one of the plurality of FETs, each one of the diodes having an electrode in Schottky contact with a diode region of the corresponding one of the FETs. The gate electrode and the diode electrode extend along parallel lines. The source region, the drain region, the channel region, and a diode region having therein the diode are disposed along a common line.
Abstract:
An RF amplifier (200) is described including an input (206), an output (210), a parallel arrangement of a first branch (202a) and at least one further branch (202b), each branch comprising a bipolar transistor (T1a',T1b') in a degenerative emitter configuration having a base coupled to the input (206), a collector coupled to a common collector node (208), and an emitter degeneration impedance (Zea', Zeb') arranged between the emitter and a common rail (212). The common collector node (208) is coupled to the output (210), the base of the first branch bipolar transistor (T1a') is biased at a first bias voltage (204a) and the base of the at least one further branch bipolar transistor (T1b') is biased (204b) at a bias voltage offset from the first bias voltage (204a). In operation of the RF amplifier (200) a IM3 distortion current output (210) by the first branch bipolar transistor (T1a') is in antiphase to a IM3 distortion current output by the at least one further branch bipolar transistor (T1b').
Abstract:
A control circuit (230) of a power amplifier (210) includes a peak detector (320), a first comparator (332), a first current source (334), a second comparator (342), a second current source (344) and a bias circuit (350). The peak detector (320) is arranged for detecting an amplitude of an input signal. The first comparator (332) is arranged for comparing the amplitude of the input signal with a first threshold to generate a first comparing result. The first current source (334) is arranged for generating a first current according to the first comparing result. The second comparator (342) is arranged for comparing the amplitude of the input signal with a second threshold to generate a second comparing result. The second current source (344) is arranged for generating a second current according to the second comparing result. The bias circuit (350) is arranged for generating a bias voltage according to the first current and the second current to the power amplifier (210).
Abstract:
The present invention relates to a self-biasing output booster amplifier (200) comprising an input amplifier stage (201), an output amplifier stage (206) being operatively connected to an output of the input amplifier stage, and first (203) and second (202) current copying circuits, wherein the second current copying circuit (202) is biased from an output of the self-biasing output booster amplifier (+). The first (203) and second (203) current copying circuits are configured to copy at least a portion of the current (Ios) through the output amplifier stage (206). The sum of the output of the second current copying circuit (202) and the output of the output amplifier stage (206) provides the output current (Isource - Io) of the self-biasing output booster amplifier (200), Finally, the input amplifier stage (201) is biased from the output of the second current copying circuit (202).
Abstract:
An input stage of a chip (1 00) includes a source follower (110) and a sensing and clamping circuit (120). The source follower (110) is arranged for receiving an AC-coupled signal to generate an output signal at an output terminal. The sensing and clamping circuit (1 20) is coupled to the source follower (110), and is arranged for clamping the output terminal of the source follower (110) at a fixed DC voltage.