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7626449 |
Apparatus and method for tuning center frequency of a filter
A method for tuning a filter is provided. The method includes: enabling a VCO circuit, wherein at least a portion of the VCO circuit is selected from the filter; generating an oscillation signal by...
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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...
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7583148 |
Transconductance control circuit, method of controlling transconductance, and a power amplifier
A transconductance control circuit, comprising: a test transconductance circuit for providing an output current from a reference voltage; apparatus for deriving a bias current for the test...
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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...
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7532073 |
Solid state power amplifier with multi-planar MMIC modules
A solid state power amplifier (SSPA) system may include a radio frequency (RF) input, an RF waveguide split block, multiple monolithic microwave integrated circuit (MMIC) power amplifier modules,...
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7522892 |
Power amplifier with serial interface and associated methods
In a power amplifier, a serial bus interface is provided for sending and receiving information to other devices, such as a baseband controller. The power amplifier includes several control pins...
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7518452 |
Voltage-controlled current source and variable-gain amplifier
A voltage-controlled current source includes a current source having temperature dependency, a voltage source having process dependency, a first signal conversion circuit which generates second...
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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...
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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...
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7492236 |
Gain compensation circuit
A gain compensation circuit, applied to a microwave transceiver, includes a gain adjuster, a first attenuator and a second attenuator. The gain adjuster is disposed between a first amplifier and a...
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7492237 |
Gain compensation circuit
A gain compensation circuit comprises a first amplifier, a second amplifier, a filter, a first attenuator, a second attenuator and a third attenuator. The first amplifier is configured to amplify...
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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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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...
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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...
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7459979 |
Semiconductor indicator for voltage diagnostics in power amplifiers
A semiconductor indicator for quantitatively diagnosing voltage conditions in high power transistor devices is provided. The semiconductor indicator includes a first transistor and a second...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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7372317 |
PTATn bias 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...
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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...
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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...
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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...
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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...
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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...
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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...
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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...
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7310015 |
Temperature-compensated circuit for power amplifier using diode voltage control
Provided is a temperature-compensated circuit for a power amplifier through diode voltage control, in which a first resistor (Rref), a first diode (D 1 ), and a second diode (D 2 ) are connected to...
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7307476 |
Method for nullifying temperature dependence and circuit therefor
A circuit and a method for nullifying temperature dependence of a circuit characteristic. The circuit includes a plurality of transistors configured such that they generate a gate voltage that...
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7288996 |
Apparatus and method reducing non-linearity in an output signal of an amplifier device
An apparatus reducing non-linearity in an output signal presented at an output locus of an amplifier device having an output unit coupled with the output locus, the output unit having at least one...
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7286019 |
Method and system for amplifying a signal
According to one embodiment of the invention, an amplifier includes a gate bias circuit operable to generate a gate bias voltage and a common gate amplifier that includes a transistor having a gate...
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7286016 |
Amplifier bias circuit, method for biasing an amplifier and integrated circuit comprising an amplifier bias circuit
An amplifier bias circuit connectable to an amplifier device, comprising a first sensor device for sensing a first amplifier characteristic and for providing at a first sensor output a bias signal...
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7282997 |
Thermal coupling device
A micro-electronic power amplifier that defines a uniform thermal impedance includes an output stage including a single transistor array including a plurality of emitter leads and a single thermal...
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7271658 |
Electric component for high frequency power amplifier
An RF power module in which operating voltage is controlled by a control signal based on amplitude information includes a temperature detecting device which is provided over a semiconductor chip...
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7268617 |
Doherty microwave amplifier and signal processing method thereof
A Doherty microwave amplifier having a main amplifier and a peaking amplifier, distributing and inputting an input signal to the main amplifier and the peaking amplifier to obtain an output signal...
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7265629 |
Circuit and method for automatic gain control
A system for generating a supply voltage, temperature and process compensated gain control voltage from a digital data word. In particular, the compensated gain voltage control voltage maintains a...
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7256653 |
High-frequency power amplifier and communication apparatus
A temperature compensation circuit 145 included in a collector voltage generation section 130 a applies an offset voltage Vofs(T) to a power control signal Vctrl according to a device...
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7253682 |
Antenna amplifier
The antenna amplifier for mobile FM radio reception includes a signal amplifier, a controllable adjusting element having a PIN diode for impedance adaptation, and a control amplifier for regulating...
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7245182 |
High frequency amplifier circuit
A high frequency amplifier circuit has a bias supplying transistor for supplying a bias current to an amplifying transistor, and first and second temperature compensating transistors for...
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7236055 |
Differential amplifier circuit and method for reducing thermally induced offsets caused by large differential signals
An amplifier includes a differential amplifier ( 10 ) having an input stage ( 20 ) for amplifying a differential input signal (Vin), and an output stage ( 6 ) coupled to the input stage ( 20 ) for...
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7230492 |
Robust monolithic automatic bias circuit with current setting apparatus
A bias circuit includes a regulator circuit and a current diverting circuit. The regulator circuit includes a load resistor, a first transistor, and feedback control circuitry for biasing the first...
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7230494 |
Method and apparatus for an LNA with high linearity and improved gain control
A method of amplifying an input signal comprises providing a semiconductor die, forming an LNA input stage having a transconductance, on the semiconductor die, and desensitizing the LNA input stage...
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7230493 |
Bias circuit with threshold voltage change compensation function and temperature change compensation function
A bias circuit which applies a bias voltage to a control terminal of a first active element for an RF signal amplification, includes a threshold voltage change compensation circuit and a first...
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7227246 |
Matching circuits on optoelectronic devices
An apparatus comprises a first substrate and a second substrate. The first substrate includes an optoelectronic device and a matching circuit. The second substrate includes a driver circuit. A...
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