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An armor with rollers is provided that enables a user to move in all positions by rolling on a hard and smooth surface while constantly varying his bearing points on the ground.
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| Number | Title | Issue Date |
| 8143933 | Semiconductor integrated circuit A semiconductor integrated circuit includes a mixer circuit unit having a first single gate mixer configured to receive a first input signal having a first frequency and a second input signal having a second frequency as inputs, a second single gate mixer configured... | 03/27/2012 |
| 8089309 | Transimpedance amplifier input stage mixer A Gilbert cell mixer design is disclosed. Instead of using a differential transconductance stage as typically done, the design employs a differential transimpedance amplifier input stage. By utilizing a transimpedance input stage to the Gilbert mixer, feedback is us... | 01/03/2012 |
| 8018267 | Frequency conversion mixer Provided is a frequency conversion mixer. The frequency conversion mixer includes a transconductance stage, a switching stage, a load stage, a current bleeding circuit, and a bias stage. The transconductance stage receives an RF signal, and outputs a current corresp... | 09/13/2011 |
| 7973587 | Transconductor having high linearity and programmable gain and mixer using the same A mixer having high linearity and an associated transconductor combining programmable gain amplifier and mixer functions are provided. The transconductor includes first and second resistors, a differential amplifier, first and second feedback circuits, and first and... | 07/05/2011 |
| 7948294 | Mixer with high linearity A mixer is provided. The transconductance stage receives an input signal through an input node and outputs an output signal through an output node. The transconductance stage includes a first transistor coupled between the output node and a first power node, having ... | 05/24/2011 |
| 7847613 | Variable transconductance mixer system A variable transconductance device for a mixer apparatus is provided. The apparatus includes at least one variable current source circuit having a plurality of selectively enabled current source stages. Each of the current source stages, when enabled, is actuable to... | 12/07/2010 |
| 7825716 | Mixer circuit In a mixer circuit, addition of analog signals by capacitive coupling is used and square-law characteristics of the drain current of a MOS transistor operating in a saturated region are used. With this configuration, the voltage and power of the mixer circuit can be... | 11/02/2010 |
| 7821318 | Wireless transceiver components with improved IQ matching A mixer includes first and second differential input pairs that include first and second transistors. First and second bias transistors receive a first signal of a differential input signal that is the one of a first phase and a second phase, and that respectively c... | 10/26/2010 |
| 7816970 | Low voltage mixer with improved gain and linearity A frequency mixing apparatus with improved voltage gain and linearity is provided. The frequency mixing apparatus includes a transconductor, a separator, and a switching unit. A voltage gain of the transconductor is controllable, and the transconductor converts a Ra... | 10/19/2010 |
| 7746151 | Variable gain mixer The mixer includes mixers constructed with variable gain amplifiers having two transistor pairs Qp+/Qp− and Qn+/Qn− to have a predetermined gain by using LO+ and LO− signals; and LO bias circuits connected to have bias voltages different from each other with r... | 06/29/2010 |
| 7710185 | Tuneable circuit for canceling third order modulation A CMOS transconductor for cancelling third-order intermodulation is provided. The transconductor includes a transconductance circuit and a tuneable distortion circuit. The transconductance circuit takes an input voltage and generates an output current having a trans... | 05/04/2010 |
| 7688130 | Passive mixer having transconductance amplifier with source degeneration capacitance A passive mixer includes a transconductance amplifier having a source degeneration capacitance. The transconductance amplifier has an input for receiving an input signal and an output for outputting a current signal. A multiplier is provided for mixing a local oscil... | 03/30/2010 |
| 7667523 | Orthogonal signal output circuit An orthogonal signal output circuit having an error correction function for correcting an orthogonal error, including: first and second differential circuits; and first to fourth variable resistors, wherein the first variable resistor is connected to a positive outp... | 02/23/2010 |
| 7616045 | Mixer with balanced local oscillator signal A mixer includes a first field effect transistor (FET) having a gate that receives a first signal of a balanced local oscillator (LO) signal, a first source/drain coupled to a ground voltage, and a second source/drain; and a second FET having a gate that receives a ... | 11/10/2009 |
| 7602227 | Differential amplifier circuit and mixer circuit having improved linearity The present invention relates to a differential amplifier and a mixer for improving the linearity. The differential amplifier circuit according to this present invention, includes first and second load stages each having a predetermined voltage value, a main differe... | 10/13/2009 |
| 7589579 | Mixer circuit A sub-harmonic mixer circuit having an input stage (52) and a current modulating stage (64 is disclosed. The input stage (52) receives an RF input signal (RF+, RF−) at a first frequency and generates output currents (il , i2) varying in... | 09/15/2009 |
| 7554381 | Mixer amplifier and radiofrequency front-end circuit The mixer amplifier includes an amplification stage having a current source circuit and a plug filter adapted to modify the current circulating in the current source circuit. The amplification stage and a mixer stage amplify an incoming signal and transpose the freq... | 06/30/2009 |
| 7532055 | CMOS-based receiver for communications applications A receiver and receiver front end having multiple independent differential inputs, multiple independent differential low-noise amplifiers, and two sets of double-balanced IQ mixers. The double-balanced mixers include cross-coupled PMOS devices that dynamically injec... | 05/12/2009 |
| 7514981 | Mixer circuit A mixer in a smaller signal differential model includes a load circuit, a switch quad, and a transconductor. The switch quad further including a first current path and a second current path is coupled to the load circuit. The connecting node of the switch quad and t... | 04/07/2009 |
| 7498861 | Mixer A mixer includes first to fourth NMOS transistors, first and second switches, first to fourth current sources, a first impedance and a second impedance. The first NMOS transistor has a drain coupled to the first impedance and a drain of the third NMOS transistor, an... | 03/03/2009 |
| 7482852 | Inductor-less local oscillator buffer An N-stage inductor-less local oscillator (LO) buffer can include N−1 non-final stages and a final stage. The final stage can includes a gain circuit, a common-mode feedback circuit connected to the gain circuit, and a replica bias circuit that provides a predeter... | 01/27/2009 |
| 7425856 | Phase interpolator with output amplitude correction A phase interpolator generates a phase-interpolated output clock signal Z from two phase-offset input clock signals A and B, where the interpolation angle of the output clock is based on a weight value W. The phase interpolator has A-side and B-side circuitry, each ... | 09/16/2008 |
| 7417486 | Voltage-current conversion circuit, amplifier, mixer circuit, and mobile appliance using the circuit A cross-coupled low-distortion voltage-current conversion circuit has transistors T1 to T6. At least one of the transistors has parallel connections of two or more transistors. By arbitrarily setting the number of parallel connections of the transistor... | 08/26/2008 |
| 7408994 | AC coupling system for wide band digital data with dynamic AC load An interface system couples a fixed impedance device to a receiver for transmitting data signals at different data rates at different times. The interface system includes elements that are connected to provide different time constants of responsiveness to data signa... | 08/05/2008 |
| 7405608 | Modulator apparatus operating at low supply voltage, and corresponding method of modulation A modulator apparatus operating at a low supply voltage, configured for receiving an input-voltage signal in base band and supplying an output-voltage signal at a given modulation frequency under control of a signal generated by a local oscillator and comprising a t... | 07/29/2008 |
| 7400184 | Current mode multiplier based on square root voltage-current relationship of MOS transistor A current mode multiplier circuit is provided based on the square root voltage-current relationship of an MOS transistor. The circuit includes first, second and third MOS transistors with a common aspect ratio, and first and second current sources that respectively ... | 07/15/2008 |
| 7382175 | Frequency mixer preventing degradation in linearity on amplitude of input signal A frequency mixer includes a first N channel MOS transistor, second and third N channel MOS transistors constituting a local oscillator signal differential pair, and having substantially identical properties, a first load, and a second load. The first N channel MOS ... | 06/03/2008 |
| 7375559 | Differential comparator with a replica input stage to set the accurate bias current for improved common mode rejection Methods and apparatus for properly biasing differential comparators are provided. Using a feedback relationship, a bias for a main stage that receives a first differential input of the comparator is produced. Separately, a feedback relationship produces a bias for a... | 05/20/2008 |
| 7375577 | Mixer capable of detecting or controlling common mode voltage thereof A mixer capable of detecting or controlling a common mode voltage thereof, includes at least: a mixing module for mixing a first set of differential signals and a second set of differential signals to generate at least one mixed signal; and a compensation module for... | 05/20/2008 |
| 7355466 | Passive mixer with direct current bias Mixer circuits with direct-current bias are disclosed. An example embodiment of such a mixer includes a first differential transistor pair and a second differential transistor pair. The example mixer also includes first and second local oscillator signal terminals a... | 04/08/2008 |
| 7356318 | Quadrature subharmonic mixer A quadrature subharmonic mixer comprises a polyphase filter configured to generate quadrature components of a local oscillator (LO) reference signal, a summing and scaling element configured to create additional components of the LO reference signal, and a plurality... | 04/08/2008 |
| 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 changes. Arrangements of these composite transistors in amplifiers a... | 03/18/2008 |
| 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 amplifying a signal applied to the input terminal to output it to the o... | 03/11/2008 |
| 7340233 | Integrated circuit and methods for third sub harmonic up conversion and down conversion of signals An integrated circuit may include a receiver and/or a transmitter that performs third order sub-harmonic conversion. The integrated circuit may include a Gilbert cell active mixer with three or more serially-connected transistors in each of the mixer's four branches... | 03/04/2008 |
| 7327301 | Single end to differential signal converter A single end to differential signal converter comprising a low-frequency transmission step, which mixes the direct current and low-frequency components of single-ended signals with in-phase voltage signals to generate low-frequency signals, and a high-frequency tran... | 02/05/2008 |
| 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 sources, a pair of first input transistors, a pair of second input tra... | 02/05/2008 |
| 7324799 | Multiband mixer The invention relates to a device for frequency conversion, comprising exactly one multi-band mixer (3) with means for transferring a signal (2) that is applied to the signal input of said multi-band mixer (3) from said signal's source frequency... | 01/29/2008 |
| 7324791 | Low-noise differential bias circuit and differential signal processing apparatus A low-noise differential bias circuit is provided which obtains excellent noise characteristics while ensuring excellent distortion characteristics. A collector of a transistor Q11 is connected to a voltage supply point (Vcc) via a resistor R15. A base... | 01/29/2008 |
| 7321735 | Optical down-converter using universal frequency translation technology A method and system for converting an optical signal to electrical information signals, including demodulated baseband information signals and modulated baseband signals at multiple harmonics. In an embodiment, the optical information signal is amplitude modulated w... | 01/22/2008 |
| 7319851 | Mixer circuit, receiver comprising a mixer circuit, wireless communication comprising a receiver, method for generating an output signal by mixing an input signal with an oscillator signal The invention relates to a mixer circuit comprising an input node for receiving an input signal, a first output node 202, and a second output node 203, voltage to current conversion means and switching means operatively coupled to each other and to the... | 01/15/2008 |
