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| Number | Title | Issue Date |
| 7719354 | Dynamic biasing system for an amplifier A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing ... | 05/18/2010 |
| 7443245 | High frequency power amplifier circuit and electronic component for high frequency power amplifier In a high frequency power amplifier circuit that supplies a bias to an amplifying FET by a current mirror method, scattering of a threshold voltage Vth due to the scattering of the channel impurity concentration of the FET, and a shift of a bias point caused by the ... | 10/28/2008 |
| 7405617 | Dynamic biasing system for an amplifier A dynamic biasing system (“DBS”) for dynamically biasing an amplifier with an adjusted bias signal is shown. The DBS may include a first biasing circuit that produces a bias signal and a second biasing circuit in signal communication with both the first biasing ... | 07/29/2008 |
| 7378881 | Variable gain amplifier circuit Embodiments of a variable gain amplifier circuit are described. In one embodiment, multiple resistor devices are coupled in series to form a string of resistor devices and to receive an input current. A multiple input operational amplifier device has an amplifier ou... | 05/27/2008 |
| 7358807 | Protection of output stage transistor of an RF power amplifier A protection method may prevent a load-mismatch-induced failure in solid-state power amplifiers. In an RF power amplifier, the load voltage standing-wave ratio results in very high voltage peaks at the collector of the final stage and may eventually lead to permanen... | 04/15/2008 |
| 7355470 | Systems and methods of RF power transmission, modulation, and amplification, including embodiments for amplifier class transitioning Methods and systems for vector combining power amplification are disclosed herein. In one embodiment, a plurality of signals are individually amplified, then summed to form a desired time-varying complex envelope signal. Phase and/or frequency characteristics of one... | 04/08/2008 |
| 7355477 | Transmitter power control loop for high-speed wireless LANs A low cost, robust method and apparatus for controlling the gain of a power amplifier to compensate for changes that are gradual with time. The bias circuit of a power amplifier is sent one of three signals in response to a measurement of the average output power le... | 04/08/2008 |
| 7345537 | Linear power amplifier with multiple output power levels A power amplifier stage has a first amplifier subsection and a second amplifier subsection coupled in a parallel configuration. The first amplifier subsection receives a signal to be amplified and the second amplifier subsection receives the signal to be amplified v... | 03/18/2008 |
| 7327107 | System and methods for automatically moving access barriers initiated by mobile transmitter devices An operator system and related methods for automatically controlling access barriers which includes a base controller associated with at least one access barrier and at least one base receiver associated with the base controller. The system also includes at least on... | 02/05/2008 |
| 7274216 | Duty cycle controlled CML-CMOS converter There is provided a CML to CMOS converter comprising two current sources both connected between a first power supply, having a first potential, and a driving node, first and second push-pull drive stages each having a current path connected between a second power su... | 09/25/2007 |
| 7227415 | High frequency power amplifier circuit and radio communication system Providing a high frequency power amplifier circuit and a radio communication system which can control output power by a power voltage, produce sufficient output power in high regions of demanded output power and improve power efficiency in low regions of demanded ou... | 06/05/2007 |
| 7228114 | Wide dynamic range power detection scheme A power detection circuit is described that provides for a wide dynamic range power detection. The circuit incorporates a coupler to sample a transmitted or received power. Such sampled power is then directed to a detector diode configured to generate a voltage from... | 06/05/2007 |
| 7205843 | Protection circuit for power amplifier A directional coupler is provided on the output side of a power amplifier. An increase in reflected wave power from a load is detected through the directional coupler by an electric power detector (wave detector). Then, a detection signal of an electric power detect... | 04/17/2007 |
| 7202735 | Multi-band power amplifier module for wireless communication devices A multi-band power amplifier module includes a first power amplifier that amplifies a first input radio frequency signal in a first frequency band in response to a first bias control signal. A second power amplifier amplifies a second input radio frequency signal in... | 04/10/2007 |
| 7199657 | Amplification gain stages having replica stages for DC bias control An amplification apparatus is provided that includes a plurality of gain stages including a first gain stage having first and second transistors and a second gain stage having third and fourth transistors. A plurality of replica stages may also be provided that incl... | 04/03/2007 |
| 7193459 | Power amplifier control technique for enhanced efficiency A power amplifier configuration including power amplifier circuitry and power control circuitry and having improved Power Added Efficiency (PAE) is provided. The power amplifier circuitry includes one or more input amplifier stages in series with a final amplifier s... | 03/20/2007 |
| 7190935 | Amplifier power detection circuitry The present invention provides an efficient way to detect the transmit power provided by an amplifier. A power sense signal indicative of the transmit power of the amplifier is generated and fed back to a control system, which will react accordingly to control input... | 03/13/2007 |
| 7167718 | Transmission power control apparatus, transmission power control method, and mobile station A transmission power control apparatus for a wireless communication apparatus which reduces a power value of a signal input to a power amplifier to the maximum allowable input power value of the power amplifier or below is provided in which the transmission power co... | 01/23/2007 |
| 7123094 | High frequency power amplifier circuit and radio communication system Providing a high frequency power amplifier circuit and a radio communication system which can control output power by a power voltage, produce sufficient output power in high regions of demanded output power and improve power efficiency in low regions of demanded ou... | 10/17/2006 |
| 7109791 | Tailored collector voltage to minimize variation in AM to PM distortion in a power amplifier A system is provided for substantially reducing variation in AM to PM distortion of a power amplifier caused by variations in RF drive power and temperature. The system includes power control circuitry and power amplifier circuitry. The power amplifier circuitry inc... | 09/19/2006 |
| 7106604 | System and method for reducing transfer function ripple in a logarithmic RMS-to-DC converter An RMS-to-DC converter system is disclosed. The system includes a variable gain amplifier having transfer function ripple that receives an input signal and provides an amplifier output signal, a detector that receives the amplifier output signal and provides a detec... | 09/12/2006 |
| 7098732 | Multi-stage variable gain amplifier utilizing overlapping gain curves to compensate for log-linear errors A multi-stage variable gain amplifier is disclosed that utilizes overlapping gain curves to compensate for log-linear errors. Each gain stage is configured to approximate a log-linear response with a sinusoidal error term such that a portion of the curve has positiv... | 08/29/2006 |
| 7076009 | Low power CDMA receiver The present embodiments provide apparatuses and methods for use in receiving radio frequency signals. In some embodiments, a method receives an input signal comprising data and jamming signals, amplifies the input signal according to a first adjustable bias level an... | 07/11/2006 |
| 7071782 | HF amplifier with switchable gain A device for amplifying or attenuating HF signals is characterized in that a transistor is connected in a common-emitter configuration in amplifying operation, and a base-collector diode is connected in the forward-biased direction for attenuating operation. ... | 07/04/2006 |
| 7072130 | Auto-ranging attenuators for read channels A recording system, such as a magnetic or optical recording system, sets input attenuation level setting and variable gain amplifier (VGA) operating region during zero gain start (ZGS) by sharing the ZGS adjustment between attenuator settings and VGS gain setting. F... | 07/04/2006 |
| 7038538 | Folded cascode high voltage operational amplifier with class AB source follower output stage An operational amplifier comprises multiple stages. A differential input stage that includes an adaptive high voltage differential pair generates up and down output currents in response to up and down input voltages. The differential input stage includes adaptive co... | 05/02/2006 |
| 7012464 | Method and circuit for a dual supply amplifier A circuit and method for bridging an analog signal between two integrated circuits operating at different supply voltages. The circuit is a two stage fixed gain amplifier. The first stage is a transconductance amplifier and the second stage is an operational amplifi... | 03/14/2006 |
| 6978126 | Transceiver with closed loop control of antenna tuning and power level A trainable transceiver for learning and transmitting an activation signal that includes an RF carrier frequency modulated with a code for remotely actuating a device, such as a garage door opener. The trainable transceiver preferably includes a controller, a signal... | 12/20/2005 |
| 6975172 | Smart voltage rail reduction audio amplifier An audio amplifier is provided that adjusts the supply voltage rails communicated to a power amplifier circuit according to the circuit's output. The amplifier compares the output voltage from the power amplifier to a predetermined voltage range to determine if the ... | 12/13/2005 |
| 6960956 | Apparatus and methods for monitoring and controlling power amplifier linearity using detected fundamental and harmonic components An apparatus for monitoring a power amplifier coupled to a transmission medium includes a detector circuit, coupled to the transmission medium, that generates first and second detector signals corresponding to respective fundamental and harmonic components of a powe... | 11/01/2005 |
| 6950636 | Power amplifier control driver having over-current protection and linear control A linear power control loop for a power amplifier is disclosed. Embodiments of the invention linearly control the power amplifier output, prevent the power amplifier from failure induced by excessive supply current by reducing power amplifier bias current, and provi... | 09/27/2005 |
| 6937097 | High-frequency power amplifier having differential inputs The present invention relates to a high-frequency power amplifier having differential inputs, and more specifically to a high-frequency power amplifier having differential inputs, in which a structure of an output port of a communication system for 2.4 GHz ISM frequ... | 08/30/2005 |
| 6927630 | RF power detector A method and apparatus is provided for detecting the output power of an RF power amplifier for purposes of controlling the output power. A circuit for generating an output power control signal includes a power detector to detect the output power of an RF power ampli... | 08/09/2005 |
| 6922093 | Radio frequency amplifier and method of driving the same A radio frequency amplifier and a method of driving the radio frequency amplifier which are excellent in the controllability at the time of a low power output while keeping the advantage of a high efficiency and give the heating generated by a power loss of such a d... | 07/26/2005 |
| 6920334 | Method and apparatus for providing gain control feedback in RF amplifiers Methods and apparatus for providing gain control feedback in rf amplifiers in such transmitting devices as cell phones. In a cell phone application, the transmit level is set by the base station. In the cell phone, the transmit level received from the base station i... | 07/19/2005 |
| 6917244 | Power control for a switching mode power amplifier The invention relates to a power control structure comprising a switching mode power amplifier for receiving an input signal, for amplifying the received input signal and for providing the amplified signal as output signal. In order to enable a power control over a ... | 07/12/2005 |
| 6903611 | Automatic gain control device An automatic gain control device without being influenced by leakage current of a capacitor. The automatic gain control device includes a first control loop, a second control loop, and a multiplexer. The first control loop receives an input voltage and generates a f... | 06/07/2005 |
| 6900694 | High frequency power amplifier module and wireless communication apparatus The number of components of a high frequency power amplifier is reduced. A bias resistance ratio is adjusted in accordance with a change in the threshold voltage Vth of a transistor. A high frequency power amplifier has a plurality of amplifying systems. Each of the... | 05/31/2005 |
| 6828854 | Method and circuit for a dual supply amplifier A circuit and method for bridging an analog signal between two integrated circuits operating at different supply voltages. The circuit is a two stage fixed gain amplifier. The first stage is a transconductance amplifier and the second stage is an operational amplifi... | 12/07/2004 |
| 6816013 | Automatic gain control device An automatic gain control device without being influenced by leakage current of a capacitor. The automatic gain control device includes a first control loop, a second control loop, and a multiplexer. The first control loop receives an input voltage and generates a f... | 11/09/2004 |
