Did You Know...
...that in 1800 ether was first used by partyers as a fun diversion? Sniffing the gas led to hilarious and raucous laughter as people watched each other become more and more intoxicated and silly. Several doctors independently realized the value ether would have to anesthetize surgery patients. Of those who claimed rights to the "discovery," none had a happy ending. One had a seizure and died defending his rights. Another spent his life in an asylum because he had been denied acclaim. A third became addicted to chloroform and, in a New York City jail, he soaked a cloth in the drug, severed an artery and bled to death.
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| Number | Title | Issue Date |
| 8183928 | CMOS power amplifier and temperature compensation circuit thereof Disclosed is a CMOS power amplifier. A temperature compensation circuit of a CMOS power amplifier may include: a bias circuit unit supplying a gate bias voltage to a power amplification circuit part; a bias detection unit determining a class type of the power amplif... | 05/22/2012 |
| 8183927 | Power amplifier According to one embodiment, a variable attenuator is arranged in an input stage, a plurality of transistors are cascaded on the later part of this variable attenuator, temperature sensors are arranged in the vicinity of two or more of the plurality of transistors t... | 05/22/2012 |
| 8149059 | Method and apparatus for compensating for gain changes in an amplifier circuit In a method and apparatus for compensating for gain changes in an amplifier circuit comprising radio-frequency modules and attenuation elements, a radio-frequency module is driven with a first temperature-dependent monitoring voltage UHF(T), and an attenu... | 04/03/2012 |
| 8098100 | Variable gain amplifiers Variable gain amplifiers with controllable gain gradient over temperature. A variable gain amplification circuit comprises an input terminal receiving an input signal, an output terminal outputting an output signal, and a control terminal receiving a first gain cont... | 01/17/2012 |
| 7994862 | Circuit and method of temperature dependent power amplifier biasing A circuit and method are provided for reducing dynamic EVM of a power amplifier (PA) used for RF communication. A temperature dependent boost bias signal is applied to the bias input port of amplifier circuitry of the PA in dependence upon a temperature of the ampli... | 08/09/2011 |
| 7872532 | High-frequency power amplifier and communication device It is an object of the present invention to provide a high-frequency power amplifier capable of improving the linearity at the time of high output by preventing decrease in power of bias supply transistor. The high-frequency power amplifier is a high-frequency power... | 01/18/2011 |
| 7755429 | System and method for dynamic drain voltage adjustment to control linearity, output power, and efficiency in RF power amplifiers A system and method for dynamic adjustment of drain or collector voltage of a power amplifier (PA), including a PA having a voltage input, a temperature sensor measuring ambient temperature of the PA, and an adaptive PA control processor that dynamically changes the... | 07/13/2010 |
| 7696826 | Temperature compensation of collector-voltage control RF amplifiers A temperature compensation system for compensating a collector-voltage controlled RF amplifier. To overcome variation that occurs with temperature which can result in signal degradation of the adjacent channel spectrum, a temperature compensated current is utilized ... | 04/13/2010 |
| 7671682 | Variable gain power amplifier A variable gain power amplifier includes a power amplifying unit and a signal generating unit. The power amplifying unit includes a control terminal, and a gain of the power amplifying unit is variable by a control signal provided through the control terminal. The s... | 03/02/2010 |
| 7656233 | Apparatus for high power amplifier in wireless communication system An apparatus for a High Power Amplifier (HPA) in a wireless communication system is provided. In one example, the apparatus includes a temperature sensor for determining temperature, a controller for receiving the determined temperature and for controlling a gate bi... | 02/02/2010 |
| 7639082 | System and method for amplifier gain measurement and compensation A system and method for amplifier gain measurement and compensation. A method for compensating a signal gain of an amplifier circuit includes determining a desired gain for the amplifier circuit, determining an operating temperature of the amplifier circuit, adjusti... | 12/29/2009 |
| 7619477 | Current sense amplifier for voltage converter A thermal calibration circuit for adjusting the gain of a variable gain amplifier, the thermal calibration circuit comprising an interface for receiving a signal that varies with temperature and for providing a signal related to the variation of the temperature; a v... | 11/17/2009 |
| 7554407 | Multi-mode power amplifier with low gain variation over temperature A multi-mode RF amplifier is described having at least a higher and a lower power path coupling an input to an output. At a pre-selected output power level, the higher power path is enabled while the lower power path is disabled when more output power is required. T... | 06/30/2009 |
| 7504886 | Thermal tail compensation A waveform processing system may include a compensation circuit to adjust a voltage supplied to an output stage, wherein a supplied voltage is controlled to substantially maintain constant power dissipation in the output stage, and wherein the compensation circuit i... | 03/17/2009 |
| 7504887 | High-frequency power amplifier and communication device To provide a high-frequency power amplifier capable of improving the linearity and efficiency of a high-frequency power amplifier by stabilizing, at high frequencies, the bias voltage of a bias circuit featuring the temperature compensating effect of a high-frequenc... | 03/17/2009 |
| 7482875 | High frequency power amplifier The invention provides a wide-band, low-noise, and small-sized high frequency power amplifier that has small temperature dependence of the gain and is excellent in input matching. A parallel circuit consisting of a resistor whose resistance depends strongly on tempe... | 01/27/2009 |
| 7471152 | Automatic gain control and tuned low noise amplifier for process-independent gain systems A tuned low-noise amplifier is disclosed. A device in accordance with the present invention comprises a first current source, a second current source, a comparator, coupled to the first current source and the second current source, for providing a control signal, an... | 12/30/2008 |
| 7456691 | Amplifier circuit with reduced temperature dependence of the gain An amplifier circuit includes an amplifier input, an amplifier output, a control terminal for adjusting a gain of the amplifier circuit, and a feedback path between the amplifier output and the control terminal, wherein a variable-impedance means, the impedance of w... | 11/25/2008 |
| 7439808 | High-frequency power amplifier A high-frequency power amplifier with a temperature compensation function for power amplifying a high-frequency signal, includes: a power amplifying transistor having an emitter grounded; a high power output bias circuit that supplies a high power output current cor... | 10/21/2008 |
| 7439807 | Method and system for generating a temperature-compensated control signal A method for generating a temperature-compensated control signal is provided. The method includes receiving a constant control signal. A temperature-compensated control signal is generated based on the constant control signal. The temperature-compensated control sig... | 10/21/2008 |
| 7425871 | Compensation units for reducing the effects of self-heating and increasing linear performance in bipolar transistors The systems and methods described herein provide for composite transistor circuit having a bipolar transistor and a compensation unit. The compensation unit can be configured to stabilize the DC biasing point of the bipolar transistor. The compensation unit can comp... | 09/16/2008 |
| 7423488 | System and method for compensating for the effects of aging and temperature on transistor performance Disclosed is a system and method for compensating for the effects of aging and temperature on the performance of transistors in an RF transmitter. The system and method use a temperature-based polynomial and a feedback control loop to correlate the drain current of ... | 09/09/2008 |
| 7417507 | Bias circuit for power amplifier having a low degradation in distortion characteristics A combined bias circuit in which a voltage drive bias circuit and a current drive bias circuit are provided in parallel with each other has a configuration in which a linearizer including a first resistor is connected between an amplifying transistor and a second re... | 08/26/2008 |
| 7405618 | Method and apparatus for controlling a power amplifier in a mobile communication system A power amplification controlling apparatus and method in a mobile communication system are provided. An amplifying part amplifies an input Radio Frequency (RF) signal with a power supply voltage. A bias adaptation part detects a change in at least one an operation ... | 07/29/2008 |
| 7403063 | Apparatus and method for tuning center frequency of a filter A tuning method and a tuning apparatus for tuning a filter are disclosed. The tuning method includes: configuring the filter as a VCO; utilizing the VCO to generate an oscillation signal according to a driving signal; comparing a frequency of the oscillation signal ... | 07/22/2008 |
| 7400202 | Bias circuit for power amplifier operated by a low external reference voltage A bias circuit includes a resistor in parallel with a voltage-drive bias circuit including a GaAs-HBT transistor. This configuration ensures that a current can be supplied from a reference voltage input terminal to the base terminal of a first transistor via the res... | 07/15/2008 |
| 7400197 | Gain control circuit capable of reducing change in gain due to variation of ambient temperature A gain control circuit capable of keeping a constant gain without being affected by ambient temperature includes a variable resistor element connected to a power supply terminal, a control unit for controlling the resistance value of the variable resistor element on... | 07/15/2008 |
| 7375588 | Transmission amplifier A transmission amplifier for amplifying a signal to be transmitted includes an amplifying unit that is warmed efficiently when the temperature is low. In a constitution in which an amplifying unit amplifies a signal, a temperature detecting means detects temperature... | 05/20/2008 |
| 7372317 | PTATbias cell for improved temperature performance A bias circuit is disclosed for use in a temperature compensation system. The bias circuit provides a current that is proportional to a temperature variation raised to an nth power where |n|>1 in accordance with an embodiment. In further embodiments, the bias circui... | 05/13/2008 |
| 7369816 | Highly accurate temperature sensor employing mixed-signal components A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry ... | 05/06/2008 |
| 7365604 | RF amplifier with a bias boosting scheme The present invention provides methods and apparatuses for an amplifier circuit for amplifying an input signal. An amplifier circuit for amplifying an input signal comprises an amplifying transistor circuit having a power transistor and a dc bias circuit having a pl... | 04/29/2008 |
| 7362178 | Wide dynamic range amplifier gain control Linear wide dynamic range variable gain amplifiers can be configured using a variable gain amplifier having an abbreviated gain control range in combination with a discrete attenuator controlled to select an attenuation from a predetermined set of attenuation values... | 04/22/2008 |
| 7358817 | Linearized bias circuit with adaptation A linearized bias circuit with adaptation resolves the problem happening to the power amplifier with conventional bias circuit that the DC and AC characteristics of the power amplifier shift or even deteriorate due to a temperature variation. The linearized bias cir... | 04/15/2008 |
| 7355480 | Bias circuit A bias circuit includes a voltage stabilizer connected between a control voltage input terminal through a current limit resistor and a ground, a bias supply emitter follower with a base connected to a node between the current limit resistor and the voltage stabilize... | 04/08/2008 |
| 7345542 | Circuit and method for avoiding circuit performance degradation caused by time-variable thermal imbalances A signal processing circuit includes a circuit stage for operating on signals in a signal path of an input signal, including main circuitry for operating on relatively small-value signals and alternative circuitry for amplifying/processing signals during a condition... | 03/18/2008 |
| 7342455 | Temperature sensor insensitive to device offsets with independent adjustment of slope and reference temperature A radio transceiver includes circuitry that enables received RF signals to be down-converted to baseband frequencies and baseband signals to be up-converted to RF signals prior to transmission without requiring conversion to an intermediate frequency. The circuitry ... | 03/11/2008 |
| 7339424 | Apparatus and method for controlling temperature of electronic apparatus In an embodiment of this invention, if a state, in which duty ratio of a PWM signal is kept equal to or greater than a predetermined value, has been maintained for a first time period, the duty ratio of the PWM signal of a digital power amplifier is adjusted downwar... | 03/04/2008 |
| 7336127 | Doherty amplifier configuration for a collector controlled power amplifier An efficient power amplifier circuitry for a mobile terminal or similar wireless communication device is provided. The power amplifier circuitry includes an output stage configured as a collector controlled Doherty amplifier, wherein the collector controlled Doherty... | 02/26/2008 |
| 7334630 | Closed-loop microchannel cooling system Apparatus and methods according to the present invention utilize micropumps that are capable of generating high pressure and flow without moving mechanical parts and the associated generation of unacceptable electrical and acoustic noise, as well as the associated r... | 02/26/2008 |
| 7332966 | High frequency power amplifier circuit A high frequency power amplifier circuit includes amplifying devices whose control terminals (gate or base terminals) are supplied with a bias voltage. The high frequency power amplifier circuit keeps constant the bias voltage so that the amplifying devices operate ... | 02/19/2008 |
