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| Number | Title | Issue Date |
| 8102213 | Multi-mode low noise amplifier with transformer source degeneration A multi-mode low noise amplifier (LNA) with transformer source degeneration is described. In an exemplary design, the multi-mode LNA includes first, second, and third transistors and first and second inductors. The first transistor has its source coupled to the firs... | 01/24/2012 |
| 8008973 | Amplifier for amplifying a high-frequency signal A transistor is provided to amplify a high frequency signal. A gate/base of the transistor receives the high frequency input signal. A variable capacitor is connected between the gate and a source/between the base and an emitter of the transistor. A variable inducto... | 08/30/2011 |
| 7978011 | Systems and methods for mitigating distortion in single-ended amplifiers Systems and methods which implement degeneration circuitry in a single-ended amplifier circuit to mitigate distortion associated with one or more amplifier components are disclosed. A degeneration circuit of embodiments adds an impedance to cancel the second-order d... | 07/12/2011 |
| 7433656 | Reducing flicker noise in two-stage amplifiers A multi-stage amplifier includes first and second amplification stages and a loading stage, all of which generate flicker noise. A degeneration block is operably disposed between circuit common and the loading stage wherein the degeneration block is operable to redu... | 10/07/2008 |
| 7432765 | Variable gain amplifier, mixer and quadrature modulator using the same A variable gain amplifier includes a voltage-to-current converter for converting the input voltage to a current, a current amplifier for amplifying the current converted by the voltage-to-current converter, a current-to-voltage converter for converting the current a... | 10/07/2008 |
| 7423487 | Variable gain feedback amplifier circuit apparatus and method therefor A variable gain feedback amplifier circuit comprising a degenerated common emitter circuit coupled to an emitter follower circuit, an output of the emitter follower circuit being coupled to an input of the degenerated common emitter circuit via a variable feedback i... | 09/09/2008 |
| 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 amplification gain and ensure linearity. A DC level of a differential signal ... | 05/27/2008 |
| 7362172 | Variable gain circuit Low distortion is implemented even in a high input level, and a smooth change in gain is maintained. A first amplifier (10) with high gain and low noise that can be gain-controlled by a first gain control signal, and a second amplifier (20) with low ga... | 04/22/2008 |
| 7348855 | Bias circuitry for cascode transistor circuit An integrated circuit includes a composite transistor including at least a first transistor of a first technology type having a first group of intrinsic properties and a second transistor of a second technology type having a second group of the intrinsic properties,... | 03/25/2008 |
| 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 coupled to a first supply voltage by a variable resistance, and a sec... | 02/19/2008 |
| 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 first blocking circuit. The reference current source provides a refere... | 01/22/2008 |
| 7319364 | Amplifier circuit having improved linearity and frequency band using multiple gated transistor Disclosed herein is an amplifier circuit having improved linearity and frequency band using a MGTR. The amplifier circuit comprises an amplification unit including a main transistor and an auxiliary transistor, an attenuation unit including inductors respectively co... | 01/15/2008 |
| 7298213 | Input impedance matching circuit for low noise amplifier An input impedance matching circuit for a low noise amplifier includes a source pad, a gate pad, an input transistor, a source degeneration inductor and a matching capacitor. The gate pad receives an input signal and the input transistor amplifies the input signal t... | 11/20/2007 |
| 7292104 | Variable gain amplifier A variable gain amplifier is disclosed where the gain of the amplifier is controlled by a variable emitter resistor that is responsive to a control signal. The variable resistor includes a resistor connected between the collector and emitter of a control transistor.... | 11/06/2007 |
| 7286013 | Coupled-inductance differential amplifier A differential amplifier that employs mutually coupled inductors to provide desired levels of inductance in a substantially smaller form factor in comparison to individual inductor components. Mutually coupled inductors according to the present teachings may also be... | 10/23/2007 |
| 7233205 | Transistor biasing independent of inductor voltage drop A differential amplifier can include input transistors for receiving a differential input signal and an inductor connected to the input transistors. The inductor can protect a voltage supply from radio frequency in the differential input signal. The accuracy of this... | 06/19/2007 |
| 7230490 | Voltage to current converter and method for converting A voltage to current converter comprises a signal stage (1) with a first transistor (11) and a first resistor (12). The first transistor (11) is adapted to be fed with an input signal voltage (Vin). The converter is adapted to ... | 06/12/2007 |
| 7221227 | Methods and apparatus for reducing output current oscillations of a driver provided with circuitry that senses and responds to excessive current draws of an output stage of the driver In one embodiment, a method is provided for reducing output current oscillations of a driver provided with i) a current sensing circuit that senses excessive current draws of an output stage of the driver, and ii) a feedback control circuit that reduces the excessiv... | 05/22/2007 |
| 7205835 | Switching mode power amplifier having increased power efficiency An increased power efficient switching mode power amplifier system. The system includes a SMPA and an E/S reactive component. The SMPA includes a transistor, an RF choke and a tank circuit. The transistor has an emitter/source and is capable of receiving an input si... | 04/17/2007 |
| 7202743 | High frequency amplifier An emitter of a transistor (1) for high frequency amplification and a cathode of a diode (5) for generating reference voltage are grounded via an inductance (20). Anode electric potential of the diode (5) decreases with increase in output... | 04/10/2007 |
| 7190227 | Variable-gain amplifier having error amplifier with constant loop gain A translinear amplifier is disclosed. A loop amplifier drives the bases of the input and output transistor pairs from the differential collector voltage of the input pair. The loop amplifier contains a third differential pair (a gain pair). The tail current of the g... | 03/13/2007 |
| 7173487 | Power amplification circuit and communication device using the same A power amplification circuit, and a communication device using the same, which are capable of suppressing gain decreases of a power amplifier due to increases in input signal power in a state near the saturation operation, capable of reducing its size, and low in d... | 02/06/2007 |
| 7167053 | Integrated circuit amplifier device and method using FET tunneling gate current An integrated circuit amplifier includes, in an exemplary embodiment, a first field effect transistor (FET) device configured as a common source amplifier with source degeneration and a second FET device configured as a tunneling gate FET, the tunneling gate FET cou... | 01/23/2007 |
| 7164318 | Continuous variable-gain low-noise amplifier Continuous variable-gain low-noise amplifier. The amplifier continuously adjusts its gain between well-defined high and low values by using a cascode current-steering circuit to partition signal current between two different nodes of an output loading network. A shu... | 01/16/2007 |
| 7145395 | Linear transconductance cell with wide tuning range A transconductance cell is disclosed. The transconductance cell may be single-ended or differential. The transconductance cell may include a tunable degeneration circuit. The tunable degeneration circuit may have a plurality of field effect transistors connected in ... | 12/05/2006 |
| 7123091 | Darlington differential amplifier A Darlington differential amplifier includes a differential pair of Darlington transistors, with each pair including a first transistor and a second transistor connected in cascade to the first transistor. The first transistor is controlled by an externally generate... | 10/17/2006 |
| 7110742 | Low noise amplifier with constant input impedance A low noise amplifier includes an input transistor, an inductor, and a current sink. The input transistor includes a gate, a drain, and a source, wherein the gate of the input transistor is operably coupled to receive an input radio frequency (RF) signal. The induct... | 09/19/2006 |
| 7106138 | Continuously variable gain radio frequency driver amplifier having linear in decibel gain control characteristics A radio frequency (RF) driver amplifier system and method that provides linear in decibel gain control is provided. The RF driver amplifier system comprises a linear transconductor receiving an input voltage and providing a controlled current based on input voltage ... | 09/12/2006 |
| 7098737 | Variable inductor, oscillator including the variable inductor and radio terminal comprising this oscillator, and amplifier including the variable inductor and radio terminal comprising this amplifier An amplifier comprises an amplifier circuit which comprises a first inductor as an impedance element for degeneration, and a control circuit which has a second inductor electro-magnetically connected to the first inductor, and changes a control current flowing throu... | 08/29/2006 |
| 7095279 | AC differential amplifier with reduced low corner frequency An AC differential amplifier includes a pair of identical differential transconductance stages. Each transconductance stage includes a pair of inputs and a pair of outputs. The pairs of output of the transconductance stages are connected in common, and form a pair o... | 08/22/2006 |
| 7084704 | Variable gain amplifier system A system for controlling gain in a polar loop is disclosed. Embodiments of the invention provide for a substantially constant gain tolerant of changes in supply voltage, ambient temperature, and/or manufacturing process. ... | 08/01/2006 |
| 7057457 | Low-noise amplifying circuit A low-noise amplifier circuit is specified which has a switchable gain ratio. For this purpose, a parallel circuit comprising a first and a second current path (3, 4) is provided between a radio-frequency signal input and output (1, 2), with the first ... | 06/06/2006 |
| 7039377 | Switchable gain amplifier A switchable gain amplifier for use in mobile communications devices is provided, having a first amplifier stage having a first gain, a second amplifier stage connected in parallel with the first amplifier stage. The first and second amplifier stage have different g... | 05/02/2006 |
| 6977552 | Impedance matching low noise amplifier having a bypass switch An impedance matching low noise amplifier (“LNA”) having a bypass switch includes an amplification circuit, a bypass switching network and a match adjustment circuit. The amplification circuit has an amplifier input and an amplifier output, and is configured to ... | 12/20/2005 |
| 6972625 | Variable transconductance variable gain amplifier utilizing a degenerated differential pair Continuously tuning a transconductance. Coupling a degeneration resistance from a first source of a first transistor in a differential pair of transistors to a second source of a second transistor in the differential pair of transistors. Applying a second variable d... | 12/06/2005 |
| 6972624 | Low-voltage high dynamic range variable-gain amplifier Circuits and methods for providing a variable gain while powered from a low-voltage supply. In a specific embodiment, an input signal is converted to a current by an emitter-degenerated pair. A portion of the input current is discarded, while the remainder is variab... | 12/06/2005 |
| 6946908 | Programmable radio frequency predistortion linearizer and method thereof A radio frequency (RF) predistortion linearizer with a transistor and a control circuit, an input matching circuit and an output matching circuit. The control circuit is electrically coupled to a control voltage source that supplies control voltages via a control no... | 09/20/2005 |
| 6933779 | Variable gain low noise amplifier The present invention is related to a variable gain low noise amplifier that optimizes input matching, gain and noise characteristics, and linearity. The variable gain low noise amplifier according to an embodiment of the present invention includes a first amplifyin... | 08/23/2005 |
| 6933787 | Linearized darlington amplifier An apparatus comprising a Darlington transistor pair and a common-base transistor. The Darlington transistor pair may be configured to generate an output signal in response to an input signal. The common-base transistor may (i) be coupled between an output transisto... | 08/23/2005 |
| 6927633 | High frequency circuit with thin film resistor A first circuit which is constituted by a thin film resistor is connected between the collector of a transistor and a power supply terminal, and a second circuit which is constituted by a semiconductor resistor is connected between the emitter of the transistor and ... | 08/09/2005 |
