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7436967 |
Apparatus and method of limiting power applied to a loudspeaker
A method of limiting the power applied to a loudspeaker is disclosed, in which both the voltage and current applied to the loudspeaker are measured, and instantaneous power is directly calculated...
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7436262 |
Highly linear variable gain amplifier
Disclosed are systems and methods which provide very linear amplification of signals using a linearized transconductance circuit. A transconductance amplifier configuration is shown which provides...
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7436260 |
Controlling the ratio of amplification factors between linear amplifiers
An electronic device where the ratio between two amplification factors of two amplifiers, called main amplifiers, is adjusted using a control means. The control means constantly equalizes the...
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7432763 |
Gain boosting for tuned differential LC circuits
A gain boost circuit and methodology are described for providing improved gain boosting with tuned amplifier circuits, such as differential low noise amplifier circuits having output resonant tank...
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7429893 |
Variable-gain amplifier and related method
A variable gain amplifier, VGA, and related method are provided. A reference current variably controlled by a control signal is provided, then the reference current is divided to a load current and...
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7425866 |
Digitally adjusted variable gain amplifier (VGA) using switchable differential pairs
A variable gain amplifier including a stage. The stage having a set of switchable differential pairs. The stage providing a gain range to a signal and adjusting a gain of the signal. At least one...
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7423481 |
Amplifier arrangement and amplifying method
In one embodiment, an amplifier arrangement includes an amplifier having a first input, a second input and an output, a first resistor network, having a first parallel circuit formed by a first...
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7420423 |
Active balun device
An active balun device is provided. The active balun device includes: a differential input portion for receiving an external single input signal to output two complementary differential signals;...
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7420410 |
Variable gain amplifier circuit, method of correcting DC offset of the variable gain amplifying circuit, and radio receiving apparatus
A variable gain amplifier circuit according to an embodiment of the invention includes: an output offset correcting unit for executing correction to attenuate a fixed offset component independent...
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7417506 |
Amplifier having switchable negative feedback
An amplifier having programmable amplification includes a transistor circuit having a plurality of negative feedback resistors, a switch being associated to a negative feedback resistor such that...
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7417492 |
Regulator
A regulator includes a digital voltage detection unit for generating a digital voltage detection signal by detecting a digital value of a voltage level of an input voltage; a variable gain...
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7405625 |
Common-mode control structures and signal converter systems for use therewith
Control structures are provided to accurately maintain amplifier common-mode levels at the predetermined level of a common-mode reference voltage V cm . The disclosed control structures provide...
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7405621 |
Apparatus for amplifying differential signal
An apparatus for amplifying differential signals is provided. The apparatus comprises a differential amplifier, a first impedance component, a second impedance component, a voltage source and a...
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7403071 |
High linearity and low noise amplifier with continuously variable gain control
An amplifier, tuner, and method of amplification are provided. The amplifier has a pair of transistors. Each transistor has a control terminal and an output terminal disposed between the transistor...
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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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7400195 |
Variable-gain differential amplifier
A variable-gain amplifier with high input impedance includes positive and negative inputs, positive and negative outputs, first and second differential circuits and first, second and third...
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7400192 |
Low noise amplifier and differential amplifier with variable gain mode
A low noise amplifier (LNA), and more particularly, to a LNA capable of making gain variable is provided. The variable gain LNA comprises a selection unit comprising a first selection cell, a...
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7397307 |
Amplifier arrangement having an adjustable gain, and use thereof
According to one or more aspects of the present invention, an amplifier arrangement is disclosed. The arrangement comprises a first, a second and a third amplifier. The first and second amplifiers...
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7394994 |
Optical receiver circuit
An optical receiver circuit comprising an optical converter circuit ( 38 ), comprising a photodiode and converting optical power into electrical power, a sensor circuit for deriving a control...
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7392033 |
Reducing active mixer flicker noise
A mixer is disclosed that includes first and second transconductance modules that, in one embodiment, includes MOSFETs configured to receive a plurality of signals that are to be mixed and a...
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7392028 |
Radio receiver/transceiver including an interface circuit selectively operable in a current mode or a voltage mode
A radio receiver is selectively operable in a current mode or a voltage mode according to conditions prevailing within a wireless environment. If the signal levels within the wireless environment...
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7391829 |
Apparatus, system and method for receiver equalization
In some embodiments, a frequency dependent gain circuit is coupled to an output of an amplifier. The gain circuit provides at least two ranges of frequency dependent gain characteristics in...
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7386075 |
Apparatus for and method of optimizing the performance of a radio frequency receiver in the presence of interference
An apparatus for and method of extending the dynamic range of a RF communications receiver. The invention provides a mechanism for controlling the gain of both the LNA and down conversion mixer in...
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7382191 |
Multiplier-transimpedance amplifier combination with input common mode feedback
A current mirror is used to bias an amplifier which is connected to a multiplier.
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7382190 |
Variable attenuation system having continuous input steering
A variable attenuation system includes a steering core that continuously steers a signal to an attenuator having multiple inputs. An embodiment having an attenuator constructed from discrete...
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7382189 |
Multi-gain amplifier with input impedance control
In one embodiment, an amplifier circuit has at least one branch and current-source circuitry providing a tail current to the branch, which has at least one load tank, at least one input transistor...
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7382166 |
Signal amplification device
A signal amplification device which uses inexpensive standard CMOS and yet is capable of high-accuracy threshold setting. An offset voltage generator detects the direct-current level of an input...
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7378908 |
Variable gain differential amplifier, and variable degeneration impedance control device and method for use in the same
Disclosed are a variable gain differential amplifier, and variable degeneration impedance control device and method for use in the variable gain differential amplifier, which can adjust an...
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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...
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7372330 |
Variable gain amplifier
A variable gain amplifier of such configuration that can yield continuously and log-linearly variable gains in relation to control voltage and, at the same time, that does not use an attenuator, an...
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7369781 |
Burst mode optical receiver considering characteristic of extinction ratio of received optical signal
Provided is a burst mode optical receiver considering a characteristic of an extinction ratio of a received optical signal is provided. By using a peak detector considering a characteristic of an...
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7358811 |
CMOS variable gain amplifier for controlling dB linear gain
Provided is a complementary metal oxide semiconductor variable gain amplifier controlling a dB linear gain and a method of controlling the dB linear gain. The complimentary metal oxide...
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7353010 |
Techniques for fast automatic gain control
An automatic gain control (AGC) technique can quickly sense signal size over a large dynamic range by using a peak detector block in the analog portion of the receiver. The peak detector block can...
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7352242 |
Programmable gain trim circuit
A programmable gain amplifier includes a first gain setting circuit and a second gain setting circuit that are both coupled to an output of an amplifier. A trim adjustment circuit is and arranged...
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7352241 |
Variable gain amplifier
A variable gain amplifier is provided. The variable gain amplifier includes a first cascode amplifier which includes a first common source transistor and a first common gate transistor, a second...
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7345541 |
Apparatus for variable gain amplifiers and mixers
Novel uses of current-dividing multi-transistors (composite transistors) are described. The composite transistors can replace transistors in otherwise traditional circuits by making suitable design...
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7342451 |
System for logarithmically controlling multiple variable gain amplifiers
A system for producing a control signal to a plurality of amplifiers sections to vary the gain of each one of the plurality of amplifier sections as a linear natural logarithmic function of an...
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7342432 |
Mixer circuit having improved linearity and noise figure
A mixer circuit having improved linearity and noise figure is disclosed. The mixer circuit comprises an amplification unit having an input terminal and an output terminal, the amplification unit...
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7340235 |
System for limiting current in an output stage of a power amplifier
A system and method for limiting current in an output stage of power amplifier circuitry in a transmitter of a mobile terminal are provided. In general, the current in the output stage of the power...
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7340069 |
System and method for split automatic gain control
A system and method for automatically controlling gain in a signal chain are presented. A first signal is processed to produce a processed signal. A gain is adjustably applied to the processed...
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7339432 |
Variable gain amplifier and differential amplifier
Variable gain amplifier includes signal amplifying transistor, and gain control transistors at output and non-output sides. Emitters or sources of gain control transistors at output and non-output...
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7333557 |
Adaptive controller for linearization of transmitter with impairments
An adaptive controller for linearization of transmitters using predistortion of the input signal has reduced sensitivity to impairments such as gain variation, phase noise or...
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7332967 |
Variable gain amplifier with low phase variation
A VGA is provided that is designed to reduce or even eliminate entirely variations in phase response/shift with changes in gain. Compensation is made for parasitic capacitances of elements in the...
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7332963 |
Low noise amplifier
A low noise amplifier is provided that includes a first circuit block capable of amplifying a first voltage signal that is input to the amplifier. The first circuit block includes a first terminal...
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7327184 |
Low-power multi-level pulse amplitude modulation driver and semiconductor device having the driver
A low-power multi-level pulse amplitude modulation (PAM) driver, and a semiconductor device having the same, in which the multi (M)-level PAM driver includes a load unit, first and second current...
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7323933 |
Vector modulator having attenuators with continuous input steering
Variable attenuation systems having continuous input steering may be used to implement vector or quadrature modulators and vector multipliers. Discrete implementations of attenuators with...
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7321266 |
Current-matching variable gain amplifier
A current-matching variable gain amplifier is provided. The amplifier comprises a reference current source, at least one cascode amplifier, a matching circuit, a control circuit, and at least one...
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7317357 |
High linearity low noise variable gain amplifier with continuous gain control
A variable gain amplifier comprises a plurality of serially connected transistor cells, in which each of the transistor cells has a plurality of connecting terminals. The first terminals of the...
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7302021 |
Digital broadcast receiving apparatus
In a digital broadcast receiving apparatus for amplifying a received modulated digital signal wave with automatically adjusted gain and demodulating the modulated signal wave to a digital signal, a...
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7301398 |
High linearity differential transconductance amplifier
The present invention is a differential transconductance amplifier circuit that includes matched cross-coupled transconductance elements connected such that the differential gain of the amplifier...
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