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| Number | Title | Issue Date |
| 8063700 | Amplifier arrangement and method for amplifying a signal An amplifier arrangement has an amplifier (3) with a signal input (31), a feedback input (32) and a signal output (33). A first coupling path (FB1), which has a first impedance element (R1), connects the feedback input (3... | 11/22/2011 |
| 7893760 | Amplifier circuit An amplifier circuit including: a multistage amplifier unit including an input-stage transistor and an output-stage transistor and configured to amplify an input signal and to output an amplified signal; and a feedback unit including a first feedback transistor, a s... | 02/22/2011 |
| 7800440 | Variable automatic limit control (ALC) threshold for any desired compression curve A signal conditioning circuit dynamically adjusts a compression ratio, so as to compress a signal and avoid limiting to the extent possible, thereby avoiding distorting the signal by clipping. An input signal is applied to the input of a programmed gain amplifier (P... | 09/21/2010 |
| 7724085 | Impedance matched variable gain low noise amplifier using shunt feed-back The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eli... | 05/25/2010 |
| 7551023 | Amplifier with low pass filter feedback An amplifier is described which amplifies an input signal according to a defined amplification factor, and which generates an output signal. To reduce an offset fraction of the output signal the amplifier comprises a feedback path which has lowpass characteristics a... | 06/23/2009 |
| 7423489 | Low return loss resistive feedback amplifier Embodiments related to resistive feedback amplifiers are presented herein. ... | 09/09/2008 |
| 7420414 | Amplifier, and step-down regulator and operational amplifier using the amplifier An amplifier has an input stage amplifying circuit, an output stage amplifying circuit, and a negative feedback circuit. The input stage amplifying circuit differential-amplifies a first input voltage inputted to a positive phase input node and a second input voltag... | 09/02/2008 |
| 7420152 | Wide-range linear output photo sensor circuit A system and method for acquisition and conditioning of a signal received from a light sensor generating an input signal in proportion to a sensed amount of light, the system utilizing an operational amplifier with first and second feedback loops to render the outpu... | 09/02/2008 |
| 7403067 | Compensation circuit for amplifiers having multiple stages An amplifier circuit comprises a first capacitance having one end that communicates with an input of a first amplifier stage. An amplifier has a first gain, an input that communicates with an opposite end of the first capacitance, and an output. A second capacitance... | 07/22/2008 |
| 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 are coupled to one another such that they form a negative feedback lo... | 07/08/2008 |
| 7372327 | Input structure for a power amplifier and associated methods A method and apparatus provides an input structure for a power amplifier. In one example, the input structure has an input network and a predriver circuit to provide an input signal to the power amplifier. The input network includes a transformer for helping to main... | 05/13/2008 |
| 7368982 | Balanced output circuit and electronic apparatus utilizing the same In a balanced output circuit, an input signal inputted thereto is provided as a first output signal thereof on one hand, and on the other hand the input signal is inputted to an inverting amplification circuit and is compared with a comparison voltage before the sig... | 05/06/2008 |
| 7368999 | DC offset cancellation for a trans-impedance amplifier The invention relates to a DC offset cancellation circuit for a trans-impedance amplifier, which is typically used for converting an input current from a photodiode into an output voltage. The DC offset cancellation circuit utilizes the monitor current from a photod... | 05/06/2008 |
| 7359136 | TMR/GMR amplifier with input current compensation An amplifier system with feedback current cancellation comprises an amplifier, a feedback network, first and second unity-gain buffers, a second resistance, and a current mirror. The amplifier includes an input, an output, and at least one stage. The feedback networ... | 04/15/2008 |
| 7355471 | Circuit for DC offset cancellation A circuit having multiple overlapped feedback loops for DC offset cancellation is provided with applying in one of multistage amplifier, multistage filter, and the combination thereof. The circuit includes a plurality of negative feedback variable bandwidth switches... | 04/08/2008 |
| 7356321 | Radio frequency tuner A radio frequency tuner is provided for selecting channels from a cable distribution network or other reception system. The tuner has one or more stages whose performance, such as signal to noise plus intermodulation, and gain are functions of the stage power consum... | 04/08/2008 |
| 7348854 | Automatic biasing and protection circuit for field effect transistor (FET) devices A transistor biasing circuit is shown that utilizes a negative feedback loop control circuit to set the gate bias voltage in the output transistors of a power amplifier. This control circuit has a current sensor in series with the drain of the transistor, the curren... | 03/25/2008 |
| 7342445 | Radio frequency power amplifier circuit and method A method (200) and radio frequency amplifier circuit (100) for adjusting a gain setting of a power amplifier (102) and a gain setting of a power amplifier driver (106) that form part of the radio frequency amplifier circuit (100). ... | 03/11/2008 |
| 7332971 | Multi-gigabit/s transimpedance amplifier for optical networks A Gigabit/s transimpedance amplifier system includes a forward-path amplifier section with a very large bandwidth and an overall frequency-selective feedback section which is active only from DC to low frequencies. The forward-path of the amplifier comprises a regul... | 02/19/2008 |
| 7327190 | Differential amplifier arrangement Circuitry for use in a differential amplifier includes an input stage having a first differential amplifier and an offset compensation stage that includes at least one controllable current source. The offset compensation stage is connected to a bias input of the fir... | 02/05/2008 |
| 7319220 | Trans-impedance amplifier with offset current A trans-impedance amplifier receives an input current and is operable to generate an output voltage responsive to the input current. The amplifier is responsive to an increased range of input currents and has a wide bandwidth. The amplifier includes an input stage h... | 01/15/2008 |
| 7317351 | Low noise amplifier A low noise amplifier (LNA) is discussed. In implementations, a LNA may include a feedback section coupled to a transistor. The feedback section may have a resistive portion including a buffer and a resistor. A capacitor may be connected in parallel with the resisto... | 01/08/2008 |
| 7313060 | Optical disk system with non-linearly controlled amplifier An optical disk system includes at least one photo detector connected with a variable gain amplifier, a slicer, and a generator which is in the feedback path between the slicer and amplifier. A differential time delay detector provides the output of the optical disk... | 12/25/2007 |
| 7310505 | Attenuation control for tuners A tuner includes an RF input with a signal level controller such as an attenuator that is provided to attenuate a signal from the RF input. A tunable RF filter provides RF band limiting and determines simultaneously the AGC bandwidth. An amplifier with resistive fee... | 12/18/2007 |
| 7304910 | Semiconductor memory device with sub-amplifiers having a variable current source A column circuit that amplifies signals read from a sense amplifier array SAA to local input/output lines LIO in sub-amplifiers SAMP to transfer the amplified signals to main input/output lines MIO is provided. A current control circuit IC that can set one of two ki... | 12/04/2007 |
| 7301394 | Impedance matched variable gain low noise amplifier using shunt feed-back The variable gain amplifier includes a forward path that provides the amplifier variable gain, and a feedback path. The feedback path uses a switch that is turned on at low gain levels. The switch taps into the feedback resistor, shunting it to signal-ground and eli... | 11/27/2007 |
| 7301371 | Transmitter of a semiconductor device Embodiments of the present invention provide a transmitter of a semiconductor device, which can output signals corresponding to input signals having various common mode levels and amplitudes. The transmitter may include a pre-driver unit, main driver unit, and a con... | 11/27/2007 |
| 7295072 | Amplifier circuit An amplifier circuit includes a first differential amplifier circuit, a second differential amplifier circuit which amplifies an output signal from the first differential amplifier circuit, and an active feedback circuit which performs waveform shaping on the output... | 11/13/2007 |
| 7292100 | Interpolated variable gain amplifier with multiple active feedback cells An interpolated variable gain amplifier (VGA) utilizes multiple active feedback cells. The active feedback cells may be implemented as transconductance (gm) cells that replicate gm cells in the interpolated input stages. ... | 11/06/2007 |
| 7289286 | TMR/GMR amplifier with input current compensation An amplifier system with feedback current cancellation comprises an amplifier having at least one stage, a feedback network, first and second replica circuits, first and second unity-gain buffers, a second resistance, and a current mirror. The feedback network inclu... | 10/30/2007 |
| 7288754 | Optical receiver An optical receiver. The optical receiver includes a photodiode, a differential transimpedance amplifier, a transistor, and a current source. When the photodiode receives an optical signal, a current signal transmitted from a cathode of the photodiode to an anode th... | 10/30/2007 |
| 7282982 | Mixer-system with gain-blocks and switches Mixer-systems comprising gain-blocks (1-4) and switches (5-8) have a flexibility depending upon their configuration (insight) and are made more flexible (basic idea) by supplying data input signals to the gain-blocks (1-4) a... | 10/16/2007 |
| 7265624 | Amplifier circuit The present invention provides an amplifier circuit comprising a differential amplifier and a negative feedback loop circuit, in which a positive feedback loop circuit having a gain smaller than a gain of the negative feedback loop circuit is formed inside the negat... | 09/04/2007 |
| 7254195 | Apparatus, methods and articles of manufacture for dynamic differential delay correction The invention is directed to a system for dynamically correcting an electromagnetic wave by processing two or more aspects of the electromagnetic wave along two or more separate signal paths; comparing an expected value for at least one of the aspects of the electro... | 08/07/2007 |
| 7253680 | Amplifier system with current-mode servo feedback A system and method for compensating an amplifier apparatus for low frequency and/or DC components of an externally applied input signal as well as for any voltage offsets contributed by the amplifier circuitry. Band-limited servo feedback is applied to predetermine... | 08/07/2007 |
| 7250818 | RF power amplifier circuit and RF transmitter and terminal including it A RFPA (radio frequency power amplifier) circuit (150) which includes a RFPA (101), a supply voltage source (104), means (155) for applying to the RFPA a gain control bias voltage and a feedback control loop (156) for adjusting a v... | 07/31/2007 |
| 7239184 | Low power and high efficiency voltage-to-current converter with improved power supply rejection A low power and high efficiency voltage-to-current (V/I) converter designed with few parts and having improved power supply rejection. The V/I converter may include an op-amp, a MOSFET, and a first and second voltage dividers. The first voltage divider circuit may i... | 07/03/2007 |
| 7239202 | Variable-gain constant-bandwidth transimpedance amplifier A transimpedance amplifier (TIA) circuit comprises a first operational transconductance amplifier (OTA) having an input and an output. A second OTA has an input and an output. A third OTA has an input that communicates with the output of the first OTA and an output ... | 07/03/2007 |
| 7239207 | Transimpedance amplifier A filter comprising an off-chip capacitor is described. The off-chip capacitor may be coupled to a circuit bonding pad. The output terminal of an amplifier may be coupled to the circuit bonding pad by a plurality of conductors insulated from one another over at leas... | 07/03/2007 |
| 7233199 | Circuit and method of establishing DC bias levels in an RF power amplifier A method and apparatus is used to provide DC stabilization and noise reduction in a multistage power amplifier. The invention uses various feedback techniques to stabilize DC levels, which helps to reduce noise. The invention also uses other techniques to reduce noi... | 06/19/2007 |
