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| Number | Title | Issue Date |
| 7880549 | Transistor including intrinsic harmonic trap Embodiments include but are not limited to apparatuses and systems including a circuit comprising a unit cell including an input and an output, and a harmonic trap, intrinsic to the unit cell, implemented on one of the input and the output. Other embodiments may be ... | 02/01/2011 |
| 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 high-pass filter. The differential amplifier receives an input different... | 07/29/2008 |
| 7390960 | Electronic signal processor An electronic signal processor for processing signals includes a complex first filter, one or more gain stages and a second filter. The first filter is characterized by a frequency response curve that includes multiple corner frequencies, with some corner frequencie... | 06/24/2008 |
| 7358800 | Programmable/tunable active RC filter A programmable/tunable active low-pass filter at least has the resistors, capacitors and shunt control means. It uses the resistor ladder that is structured with various fixed resistors to implement the shunt control means. The cut-off frequency of a filter is assoc... | 04/15/2008 |
| 7324790 | Wireless transceiver and method of operating the same A transceiver 400 is provided in an ultrawide bandwidth device, which includes an antenna 110, a transmitter circuit 145, and a receiver circuit 165. A transmitter amplifier 440 is provided between the antenna 110 and the tr... | 01/29/2008 |
| 7319310 | Regulated power supply unit An improved power supply unit includes a DC power source having a positive terminal and a negative terminal, and a voltage regulating circuit that includes a plurality of elements coupled in series between the positive and negative terminals of the DC power source t... | 01/15/2008 |
| 7313201 | Multi-range transconductor and method of operation A method for tuning a transconductor includes receiving a digital value. The method also includes determining a bit value for a selected bit of the digital value, and selecting a tuning range for a transconductor based on the bit value. The method further includes t... | 12/25/2007 |
| 7301392 | Tunable resonator for use in active-RC continuous-time filters An integrated circuit (IC) resonator in which resonator parameters potentially affected by IC fabrication processes are correctable after fabrication. Resonance frequency tuning is effected by forming each feedback capacitor in a pair of integrator circuits to inclu... | 11/27/2007 |
| 7245186 | Bandpass amplifier The present invention discloses a bandpass amplifier having gain and bandpass performance. The bandpass amplifier includes an input match unit for matching the gain of the amplifier and having a first filter response; a first bias unit electrically connected to the ... | 07/17/2007 |
| 7202645 | Regulated power supply unit An improved power supply unit includes a DC power source having a positive terminal and a negative terminal, and a voltage regulating circuit that includes a plurality of elements coupled in series between the positive and negative terminals of the DC power source t... | 04/10/2007 |
| 7174147 | Bandpass filter with tunable resonator A tunable bandpass filter is provided that comprises a first shunt-connected ferroelectric (FE) tunable tank circuit having a first node to accept an input signal. A second shunt-connected FE tunable tank circuit has a second node to supply a bandpass filtered signa... | 02/06/2007 |
| 7139544 | Direct down-conversion receiver with transconductance-capacitor filter and method A direct-down conversion receiver may include a transconductance-capacitor (GmC) filter to filter undesirable mixing products and provide a filtered baseband-differential signal. The GmC filter may include first and second transconductance-capacitor (GmC) circuits i... | 11/21/2006 |
| 7138873 | Filter circuit providing low distortion and enhanced flexibility to obtain variable gain amplification A low distortion filter circuit implementing variable gain amplification (VGA). An aspect of the present invention increases the degrees of freedom (number of components which can be independently programmed/changed to corresponding desired values) to achieve a desi... | 11/21/2006 |
| 7123082 | Variable time constant circuit and filter circuit using the same A variable time constant circuit includes an inverting amplifier which has an amplifier input terminal and an amplifier output terminal connected to a signal output terminal and inverts a signal inputted to the amplifier input terminal, a first and a second resistor... | 10/17/2006 |
| 7109786 | Biquad notch filter A biquad notch filter includes a first stage having first and second admittances of a first type connected between an input terminal and the control terminal of a transistor, a first current source connected between a first supply terminal and a first terminal of th... | 09/19/2006 |
| 7109781 | Temperature compensation for internal inductor resistance A compensation circuit compensates for the variation in the internal resistance of a multi-track inductor over temperature. The compensation circuit includes a dummy inductor that has the same temperature dependent resistance as that of the multi-track inductor that... | 09/19/2006 |
| 7054172 | Method and structure for active power supply control and stabilization A method and structure for active power control of a power supply element coupled to an electronic circuit. The structure comprises a control element coupled to the electronic circuit, said control element comprising one or more of a phase detector, a counter, a lev... | 05/30/2006 |
| 7039202 | Microphone unit A microphone unit capable of suppressing the sensitivity reduction due to a parasitic capacitance that occurs depending on the structure of an electret capacitor, can be realized by the following manner. Specifically, an output signal (Vout) that is the inverted out... | 05/02/2006 |
| 7026824 | Voltage reference generator with negative feedback A voltage reference generator for generating an output voltage at an output node. A level shifter shifts a first reference voltage into the output voltage at the output node according to a shift between the first reference voltage and the output voltage, and a feedb... | 04/11/2006 |
| 7026856 | Continuous-time filter A continuous-time filter comprising at least one amplifier and at least one passive element. The amplifier comprises at least one input terminal and at least one output terminal and the passive element is positioned between the terminals. In addition the amplifier i... | 04/11/2006 |
| 7009446 | Active filter circuit with reduced noise Input conversion noises of a filter circuit are reduced. The circuit has plural circuit arrangements obtained by dividing the filter circuit so as to include at least one voltage controlled current source, and at least one circuit arrangement is an amplification cir... | 03/07/2006 |
| 6977541 | Variable time constant circuit and filter circuit using the same A variable time constant circuit includes an inverting amplifier which has an amplifier input terminal and an amplifier output terminal connected to a signal output terminal and inverts a signal inputted to the amplifier input terminal, a first and a second resistor... | 12/20/2005 |
| 6977542 | Adjusting the trans-conductance of a filter A digital tuning circuit which generates a digital code representative of a difference of signals generated by a mirror trans-conductor circuit (having electrical characteristics similar to a trans-conductor circuit in a filter) and a reference circuit. The digital ... | 12/20/2005 |
| 6975848 | Method and apparatus for DC offset removal in a radio frequency communication channel A filter module for reducing a DC offset voltage in a radio frequency communication channel is described. A first capacitor is coupled between a first differential input node and a first differential output node. A second capacitor is coupled between a second differ... | 12/13/2005 |
| 6967606 | Loop filter for a continuous time sigma delta analog to digital converter A loop filter for a continuous time sigma delta analog to digital converter which converts an analog input signal into a digital output signal, said loop filter comprising an active analog filter which includes active devices for providing a power gain, wherein the ... | 11/22/2005 |
| 6791401 | Continuous-time analog filter having controllable gain characteristics A Gm-C filter includes a filter passing an intended signal SI# in an input signal SI, and a control signal producing portion detecting a peak voltage value of an output signal of a filter to be controlled and a peak voltage value of the intended signal SI#, and maki... | 09/14/2004 |
| 6747531 | Circuit and method for input side impedance matching of a power amplifier in an electronic device A circuit and method for input side impedance matching of a power amplifier in an electronic device. Specifically, the present invention provides an impedance transformer network that includes a negative resistor in series with a bondwire inductor. The network is pl... | 06/08/2004 |
| 6744306 | Filter circuit A filter circuit includes two first differential circuits disposed on A and B sides, in each of which a ratio of the number of transistors to that of diodes is 1:4, and two second differential circuits disposed on the A and B sides, in each of which the ratio of the... | 06/01/2004 |
| 6724263 | High-frequency power amplifier A high-frequency power amplifier includes a transistor which is inputted with a high-frequency signal, amplifies the high-frequency signal and outputs the same; a fundamental-signal matching circuit, one end of which is connected to an output of said transistor and ... | 04/20/2004 |
| 6720817 | All NPN class-AB log-domain integrator with supporting input and output circuitry for low-voltage and high-frequency continuous-time filtering Two variations of a continuous-time instantaneous companding filter are integrated in a 25 GHz bipolar process. Their −3 dB frequencies are tunable in the ranges of 1-30 MHz and 30-100 MHz. The dc gains are controllable up to 10 dB. The measured dynamic ranges for... | 04/13/2004 |
| 6703682 | High sheet MOS resistor method and apparatus A method and apparatus is disclosed for providing highly linear resistance with high sheet values, and for implementing resistors in a conventional CMOS process when either drain or source must operate near the rail of a circuit. Accordingly, a five termi... | 03/09/2004 |
| 6700792 | High-frequency composite component and portable wireless device incorporating the component A high-frequency composite component can achieve reduction in size and weight, while providing high performance. A portable wireless device incorporates the high-frequency composite component, including a multi-layer substrate, with a low noise amplifier ... | 03/02/2004 |
| 6700445 | Filter circuits based on trans-conductor circuits A filter circuit uses a trans-conductor circuit coupled to a control circuit having similar characteristics as the trans-conductor circuit. The control circuit is used to set and/or control the quiescent voltage of the trans-conductor circuit. As a result... | 03/02/2004 |
| 6664854 | Base band filter including a semiconductor integrated circuit When an input signal to be amplified is very small and a large blocking signal having a high frequency is included in an input, it is necessary for a filter for mobile communication for removing thereof that a common-mode signal rejection ratio is large. ... | 12/16/2003 |
| 6624704 | High speed high current gain operational amplifier An operational amplifier having a low impedance input and a high current gain output. The operational amplifier comprises: 1) a first N-channel transistor having a source coupled to the low impedance input of the operational amplifier; 2) a first constant... | 09/23/2003 |
| 6566949 | Highly linear high-speed transconductance amplifier for Gm-C filters A transconductance amplifier and method for improving the phase response and linearity. A differential amplifier circuit receives differential signals for amplification on respective bases of input bipolar transistors. The transistors amplify a small sign... | 05/20/2003 |
| 6556078 | Integrated low-corner frequency high pass filter circuit A low-corner frequency high pass filter circuit (10) includes an operational amplifier (12). The operational amplifier (12) has an inverting input (14) and a non-inverting input (24). A series capacitor (26) has a first end connected to the non-inverting ... | 04/29/2003 |
| 6549076 | High-output amplifier A high-output amplifier (1), having a high gain, (2) having a high efficiency, (3) less affected by temperature changes, (4) operative linearly in output levels over a wide dynamic range and (5) using a control voltage, comprises a transistor amplifier, a... | 04/15/2003 |
| 6516069 | Microphone filter and microphone unit A large-time-constant microphone filter which contains resistance and capacitance as its constituent and can be formed in the same semiconductor chip as a microphone unit is achieved, which results in downsizing and cost reduction of the microphone unit. ... | 02/04/2003 |
| 6504432 | Tunable, dynamic, and self-biasing differential amplifier and application thereof A tunable differential amplifier includes an amplifier circuit, a current mirror, a dynamic current regulator, and a dynamic output common mode regulator. The current mirror is operably coupled to the amplifier circuit and controls the current flowing thr... | 01/07/2003 |
