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Document Title |
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7622994 |
Bias circuit with increased power supply rejection
According to one exemplary embodiment, a power supply rejection bias circuit includes a first amplifier coupled to a second amplifier, where the first amplifier receives a reference voltage, and a...
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7616060 |
Power amplifier
An amplifying transistor for amplifying a radio frequency signal between an input terminal and an output terminal. The cathode of a first diode is connected to the input terminal and the anode of a...
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7612614 |
Device and method for biasing a transistor amplifier
Provided is circuitry for biasing a transistor amplifier with a DC-voltage signal, the transistor amplifier having a first input terminal, a second input terminal, and an output terminal coupled to...
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7612613 |
Self regulating biasing circuit
A disclosed self regulating biasing circuit (SRBC) includes an unregulated node that couples to an unregulated power supply that produces a supply voltage. An impedance element of the SRBC carries...
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7612611 |
Amplifier circuit
An amplifier circuit for amplifying a high-frequency input signal comprises an amplifier stage, which amplifies the high-frequency input signal as a function of an operating point of the amplifier...
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7612610 |
Active input load wide bandwidth low noise HEMT amplifier
A relatively wide bandwidth low noise amplifier with an active input matching network. The active load maybe formed from a field effect transistor (FET) or high electron mobility transistor (HEMT)...
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7609113 |
Constant current bias circuit and associated method
A constant current bias circuit and associated method is disclosed. The constant current bias circuit comprises an output stage for amplifying a radio frequency (RF) signal, wherein the output...
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7599670 |
Dynamic bias for receiver controlled by radio link quality
DC power savings in a mobile communication device can be achieved by dynamically adjusting the biasing for a receiver based on the communication link quality. The output signal levels of at least...
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7590395 |
Power management scheme for software-defined radios
A power management system is provided for a software-defined radio. The power management system includes: an antenna; a regulated power supply; a power amplifier; and a digital signal processor. A...
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7579914 |
Bias circuit and power amplifier
A bias circuit includes: a first transistor having a base terminal grounded via a resistor, and a collector terminal connected to a first power supply port via an adjustment resistor; a second...
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7576612 |
Power amplifier
The present invention provides a power amplifier that includes the following: an RF operation transistor 3 having a base to which an RF signals is inputted, an emitter connected to the ground,...
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7573336 |
Power amplifier and multistage amplification circuit including same
A bias circuit 22 in a power amplifier 1 is provided with a VBE-controlled voltage source circuit 20 and a Nagata current mirror circuit 21. The Nagata current mirror circuit 21 includes...
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7567126 |
Variable gain amplifier and control method thereof
A variable gain amplifier has a first amplifier circuit ( 106 ) having a first field-effect transistor and amplifying a signal input to a gate of the first field-effect transistor to output; a gate...
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7567123 |
Adaptive bias current circuit and method for amplifiers
An adaptive bias method and circuits for amplifiers that provide a substantial current boost based at least partly upon a sensed input power of an amplifier circuit. Methods and circuits of the...
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7564311 |
Method and apparatus to enhance linearity and efficiency in an RF power amplifier
Dynamic biasing techniques are used to enhance both linearity and efficiency within a transistor power amplifier. In at least one embodiment, as the power level being processed by a transistor...
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7560993 |
Amplifier
An amplifier has a self-bias circuit to generate the bias voltage for the input of the amplifying circuit in the amplifier, thereby simplifying the circuit complexity to reduce the size and cost of...
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7560992 |
Dynamically biased amplifier
The present invention provides dynamic biasing of transistor in an amplifier ( 1 ) comprising at least two interconnected transistor ( 10, 20 ) provided for processing an input signal. Once the...
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7560990 |
Low noise amplifier and low noise amplifying method
A low noise amplifier for operating in response to different gain modes is disclosed. The low noise amplifier includes a voltage adjusting circuit, which provides a first bias voltage at a first...
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7551032 |
Method and apparatus for controlling the output power of a power amplifier
A method and apparatus is provided for use with a power amplifier to provide a regulated supply to the power amplifier. The invention uses a combination of voltage and current regulation to...
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7551027 |
RF power amplifier mirror circuit for sensing current
An apparatus and method is disclosed for providing a mirror circuit for detecting a change in current of a RF power amplifier. The mirror circuit includes a voltage operably coupled with the mirror...
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7548116 |
High-frequency circuit of reduced circuit scale
A high-frequency circuit is provided. In the high-frequency circuit, a first PIN diode is provided in a signal line and a second PIN diode is provided between the signal line and ground so that an...
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7548111 |
Miniature dual band power amplifier with reserved pins
A radio frequency (RF) module provides first and second power amplifiers configured to produce first and second amplified RF signals at first and second output RF terminals, respectively; and first...
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7545219 |
Open loop DC control for a transimpedance feedback amplifier
A transimpedance amplifier having open-loop DC control is provided. The open-loop feedback control may provide a DC bias that is configurable based on the characteristics of an input device, such...
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7545206 |
Apparatus for and method of biasing a transistor
An apparatus for biasing a transistor, comprising: a controllable bias generator; a test circuit; a digital M th order differentiator responsive to an output of the test circuit; and a controller...
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7541874 |
High-frequency power amplifier device
A high-frequency power amplifier device including: a power amplifier circuit which amplifies a high-frequency signal; an output matching circuit connected to an output side of the power amplifier...
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7541872 |
Startup circuit for subregulated amplifier
A multi-stage circuit has a first stage powered by the output voltage of a next stage. A current source within the first stage provides a tail current for a differential amplifier within the first...
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7539269 |
Method and apparatus for discrete power synthesis of multicarrier signals with constant envelope power amplifiers
A power synthesizer is in several (n) discrete stages, each stage having a discrete amplitude, constant envelope amplifier coupled in series with a continuous phase modulator. Each modulator is...
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7532075 |
Bias circuit
A bias circuit 100 comprises: a first reactance means 2 connected to an AC circuit; a second reactance means 3 connected to the first reactance means 2 ; a switch 7 connected to a...
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7532074 |
Device and method for biasing a transistor amplifier
A biasing circuit adapted for operative coupling to the first input terminal so as to provide a relatively high biasing impedance to ground at the first input terminal, said biasing circuit being...
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7532066 |
Bias network with stable transient response
Embodiments of apparatuses, articles, methods, and systems for a bias network providing a stable transient response are generally described herein. Other embodiments may be described and claimed.
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7525388 |
Bias circuits and signal amplifier circuits
A bias circuit includes a transistor having a control gate, a first terminal and a second terminal coupled to a ground level, a first resistor coupled to the control gate, a first capacitor coupled...
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7525387 |
Amplifier circuit
An amplifier circuit includes a first bipolar transistor of which the emitter is connected to the ground, and a bias circuit of the first bipolar transistor. The bias circuit includes a second...
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7522003 |
Constant margin CMOS biasing circuit
A biasing circuit is presented. The biasing circuit includes a primary biasing circuit, a replica circuit and an amplifier. The primary circuit provides a biasing voltage and a primary voltage. The...
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7522001 |
Power amplifier
An emitter follower circuit applies to an input terminal of a second amplifying device a voltage according to a reference voltage applied to a reference terminal. First and second resistors are...
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7512389 |
Active inductors using bipolar silicon transistors
An active inductor includes bipolar transistors T 1 , T 2 , T 3 and TD (TD being arranged in diode), where T 1 's emitter is connected to an output port and to T 2 's collector. T 2 's base is...
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7511577 |
DC coupled microwave amplifier with adjustable offsets
An output amplifier stage covers a flat frequency range of DC to microwave frequencies with provisions for independent control of input and output DC offset. The output amplifier stage includes a...
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7511576 |
High frequency power amplifying circuit and high frequency electronic component using the same
In an amplifying circuit using a grounded-emitter high frequency signal amplifying bipolar transistor, the value of impedance of a bias circuit as seen from the base terminal of the bipolar...
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7511573 |
Input/output signals preserver circuit of amplification circuits
The present invention relates to an input and output signal preservation circuit of an amplification circuit capable of preventing an attenuation of an input signal and an output signal of an...
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7508261 |
Systems of miniaturized compatible radio frequency wireless devices
A system of compatible modules includes a radio frequency (RF) module with a power amplifier configured to produce an amplified RF signal at an output RF terminal; and a first row of pads and a...
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7501896 |
High frequency power amplifier circuit, high frequency power amplifier electronic component and method thereof
A high frequency power amplifier electronic component (RF power module) is so constituted as to apply bias to an amplifier FET in current mirror configuration. In this RF power module, deviation of...
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7492227 |
Method and apparatus for increasing efficiency of electrical systems
In accordance with the teachings of the present invention, a method and apparatus for increasing the efficiency of electrical systems are provided. In a particular embodiment, the apparatus...
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7489791 |
A/D converter with integrated biasing for a microphone
A combination of a microphone and a sigma-delta A/D converter include at least one feedback loop, such as a DC feedback loop. The DC feedback loop provides the bias current for a junction FET of...
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7489196 |
Output power control of an RF amplifier
Precision and reliability of a current limited mode output power control of an RF amplifier is enhanced by sensing the base current of the current controlled output power transistor. The base...
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7489195 |
Variable gain amplifying circuit
A variable gain amplifying circuit comprises two stages, a first stage and a second stage with a common voltage-to-current converter. Each stage comprises two BJTs, two voltage controlled current...
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7489191 |
Circuit and method for reducing bias noise in amplifier circuits
An amplifier circuit and method for reducing bias noise is disclosed. The amplifier circuit includes a passive biasing source for supplying a desired bias signal to the amplifier and an active...
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7486143 |
Circuit for biasing a transistor and related system and method
An embodiment of a circuit for biasing a transistor such as an amplifier transistor includes reference and bias nodes, and includes buffer, reference, and feedback stages. The reference node...
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7486142 |
Radio frequency power amplifying module with hetero junction bipolar transistor
The present invention is directed to compensate electric properties of an RF power module depending on changes with time, temperature dependency, variations, and the like of grounded emitter...
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7482876 |
Amplifier circuit and method for amplifying a signal to be amplified
An amplifier circuit includes a first series circuit connected between a supply voltage and a reference potential. The first series circuit includes a current source, a first tap and a first...
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7479833 |
Dynamic biasing amplifier apparatus, dynamic biasing apparatus and method
A dynamic biasing amplifier apparatus, and dynamic biasing apparatus, and method are disclosed. The dynamic biasing amplifier apparatus includes a comparator unit, a dynamic bias generator unit,...
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7477106 |
Power amplifier with bias control
A power amplifier ( 100 ) suitable for use in mobile telecommunications equipment has a first stage ( 2 ) and an optional second stage ( 2 ), each stage being provided with a bias circuit ( 4, 5 )....
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