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| Number | Title | Issue Date |
| 7342987 | 90-degree phase shifter The 90-degree phase shifter of the invention has: a T flip-flop including transistors Q3 to Q6 and Q9 to Q12 that together constitute a dual differential circuit, input transistors Q1 and Q2 that receive at their bases an in... | 03/11/2008 |
| 7334735 | Card for interaction with a computer A smart card comprising: a memory for storing information; at least one transmitting or receiving antenna; and a low frequency circuit, for handling information associated with said antenna and said memory, which information is modulated at a modulation frequency of... | 02/26/2008 |
| 7332950 | DLL measure initialization circuit for high frequency operation A memory device, delay lock loop circuit (DLL) and DLL reset circuitry are described. The DLL includes a shift register and a measured delay for pre-loading the shift register. The reset circuitry selectively filters a clock signal propagation through the measured d... | 02/19/2008 |
| 7280616 | Optimizing a filter bandwidth in a digital receiver A digital receiver comprises a quadrature zero intermediate frequency tuner supplying I and Q components to adjustable low pass analog filters. In the case of OFDM signals, a demodulator contains a measuring arrangement which determines the average power of carriers... | 10/09/2007 |
| 7245153 | Level shift circuit having timing adjustment circuit for maintaining duty ratio A level shift circuit for shifting levels of a pair of binary input signals having a first voltage range to produce a pair of binary output signals having a second voltage range includes a first circuit to shift a level of a first one of the binary input signals the... | 07/17/2007 |
| 7242228 | Method and device for generating an output signal having a predetermined phase shift with respect to an input signal An output signal is generated with a predetermined phase shift with respect to an input signal using a closed loop control. The input and output signal of the closed loop control are logically combined in accordance with first and second combinatory logic to generat... | 07/10/2007 |
| 7215157 | Small-amplitude differential interface circuit First, second and third current generators, and first and second switching devices are provided. Current values of the first and second current generators are equal to each other and a current value of the third current generator is twice as large as the current val... | 05/08/2007 |
| 7203860 | Clock recovery circuit for high-speed data signal transmission A clock recovery circuit has a phase comparator circuit, a phase adjusting circuit, and a duty cycle correction circuit. The phase comparator circuit carries out phase comparison between an input signal and an output signal, and outputs a phase control signal propor... | 04/10/2007 |
| 7194056 | Determining phase relationships using digital phase values Disclosed herein are circuits in which a plurality of clock signals are generated by corresponding clock generators from one or more common clock references. The clock generators accept control values that specify the phases of the individual clocks. The actual phas... | 03/20/2007 |
| 7187917 | Current interpolation in multi-phase local oscillator for use with harmonic rejection mixer A circuit provides a reduced harmonic content output signal OUTA and/or OUTB that is modulated according to an input signal 231. The circuit has an oscillator circuit 210 and a harmonic rejection mixer (HRM) 230. The oscillator circuit 210 | 03/06/2007 |
| 7183929 | Control of toys and devices by sounds A method of controlling at least one device by incidental sound produced by a living creature and including: attaching a sound-maker to a living creature so that the natural movements of the living creature will cause the sound-maker to emit a sound; receiving the s... | 02/27/2007 |
| 7180352 | Clock recovery using clock phase interpolator A clock recovery circuit includes a delay locked loop, and a clock phase interpolator circuit. The delay locked loop provides multiple phases of an input clock signal to the interpolator circuit, which interpolates between two of the clock phases to provide a clock ... | 02/20/2007 |
| 7142614 | Signal generating circuit for generating a reference phase signal and a quadrature signal In a signal generating circuit SG1, a 90 -degree divider 3 generates, from a local oscillation signal SLO supplied through an input terminal 1, an intermediate reference phase signal ISREF and an intermediate quadrature sig... | 11/28/2006 |
| 7123103 | Systems and method for automatic quadrature phase imbalance compensation using a delay locked loop An automatic quadrature phase compensation system comprises an on-chip analog phase sense circuit capable of detecting small differences in quadrature phase error and providing a corresponding DC voltage, a voltage-controlled or programmable phase delay circuit to i... | 10/17/2006 |
| 7119607 | Apparatus and method for resonance reduction A system is provided that includes a power distribution network to provide a switching current and a resonance reduction circuit to sense the switching current within a frequency range and to generate a resonance reduction signal having a current component at substa... | 10/10/2006 |
| 7057431 | Digital DLL apparatus for correcting duty cycle and method thereof A digital DLL apparatus and a method for correcting a duty cycle are disclosed. The apparatus includes: a delay line unit for receiving external clock signal and generating first and second delayed internal clock signals by delaying the external clock signal; a duty... | 06/06/2006 |
| 6995593 | Circuit for programmable stepless clock shifting The present invention provides for a circuit for programmable stepless clock shifting, consisting of a splitter generating a 0° and a 90° shifted clocks from a reference clock, and an interpolator of the two shifted clocks, which provides at the output the desired... | 02/07/2006 |
| 6873198 | Tunable quadrature phase shifter The present invention relates to a tunable quadrature phase shifter comprising an input (IN) for inputting an input signal (vin), splitting means (10) for splitting the input signal into two essentially orthogonal first and second signals (i1, i2 | 03/29/2005 |
| 6850121 | TDMA transmit frequency generator suppressing frequency jumps caused by feedback A transmit frequency is generated for a transceiver by a controllable oscillator which generates an oscillator frequency, a divider by a factor N, and a mixer stage with a subsequent band filter. Signals with the oscillator frequency and the oscillator frequency div... | 02/01/2005 |
| 6822496 | Integrated circuit device implementing 90-degree phase shifter capable of generating output signals having phase difference therebetween at improved accuracy Disclosed is an integrated circuit device in which a 90-degree phase shifter is implemented. The 90-degree phase shifter includes four input capacitors all having equal capacitance and four output capacitors all having equal capacitance. The input capacitors and the... | 11/23/2004 |
| 6747499 | Tunable quadrature phase shifter using an all-pass circuit The present invention relates to a tunable quadrature phase shifter comprising an input (IN) for inputting an input signal (vin), splitting means (10) for splitting the input signal into two essentially orthogonal first and second signals (i1, i2 | 06/08/2004 |
| 6677796 | Method and apparatus for implementing precision time delays A system and method of implementing precision time delays that provides important and novel improvements over prior techniques of implementing time delays by utilizing a new strategy for selecting the values in the sine and cosine lookup tables. Sine and ... | 01/13/2004 |
| 6456143 | Frequency multiplier circuit and semiconductor integrated circuit A frequency multiplier circuit comprises: a source oscillator configured to generate a source oscillator signal using a crystal oscillator; and n frequency multiplier circuits (n is an integer which is 2 or more), each of which includes a 90° phase shift... | 09/24/2002 |
| 6400778 | DC-offset canceller A DC-offset canceller in a receiver of a communication system using a burst signal including a training sequence with a predetermined periodicity at the head thereof is disclosed. In the canceller, a quadrature demodulator 112 converts the received burst ... | 06/04/2002 |
| 6356131 | 90-degree phase shifter There is disclosed a 90-degree phase shifter so configured that an input signal is supplied through a variable gain amplifying circuit and a phase adjusting circuit to a low pass filter and also supplied through another variable gain amplifying circuit an... | 03/12/2002 |
| 6340908 | Phase adjusting circuit, scaling signal generation circuit using phase adjusting circuit, and position measuring apparatus using scaling signal generation circuit A phase adjusting circuit including an input level adjuster using two detection signals having different phases and adjusting an amplitude of at least one detection signal to a predetermined level and a signal processor for signal processing including at ... | 01/22/2002 |
| 6172543 | 90° phase shift circuit A 90° phase shift circuit receives an input signal to generate a Q-signal and an I-signal having a phase difference of 90° therebetween. The 90° phase shift circuit has a CR-type high-pass filter having a variable capacitor and fixed resistor, a CR-typ... | 01/09/2001 |
| 6137353 | Linearized integrated FM demodulator using a plurality of cascaded all-pass filters or a bessel filter An approach for demodulating a frequency-modulated signal involves processing a frequency-modulated signal with a phase shifter network to provide a demodulated signal that has a relatively constant amplitude around the center frequency of the frequency-m... | 10/24/2000 |
| 6078200 | Clock signal generator A clock signal generator includes a phase shifter for generating four clock signals having phases consecutively shifted from one another by 90 degrees based on an external clock signal, a mixer for mixing two of the four clock signals to output an interna... | 06/20/2000 |
| 6054883 | High accuracy 90° phase shift circuit error detection A phase shift circuit includes a CR phase shifter for receiving an input signal to output a pair of first signals having a 90° phase difference therebetween, a pair of variable-gain amplifiers for receiving the first signals to output a pair of second si... | 04/25/2000 |
| 5949267 | Circuit arrangement for generating signals with different phases The invention relates to a circuit arrangement for generating two signals having a phase difference of approximately 90 degrees. The invention is preferably applied in the demodulator of a radio receiver. In order to shift the phase of a signal one idea o... | 09/07/1999 |
| 5914623 | 90°-phase shifter A 90°-phase shifter which operates in condition both of high-speed and low dissipation power, and an output signal with precise 90°-phase difference is capable of taking off is provided. It causes input signals with complementary relation each other to ... | 06/22/1999 |
| 5896053 | Single ended to differential converter and 50% duty cycle signal generator and method A high frequency, current mode, single-ended-to-differential signal converter with low input impedance constant to very high frequencies and a balanced output signal even for large signals. A wide range of input voltages may be accommodated and a d.c. off... | 04/20/1999 |
| 5815020 | Balance differential receiver A quadrant detector circuit (400) has a comparator (442) having a pair of inputs (438, 440). A first (438) of the pair of inputs (438, 440) is coupled to an in-phase signal (434) and a second (440) of the pair of inputs (438, 440) is coupled to a quadratu... | 09/29/1998 |
| 5808498 | At frequency phase shifting circuit for use in a quadrature clock generator A phase shifting circuit that may be used as part of a quadrature clock generator. The phase shifting circuit comprises a triangle wave generator coupled to receive an input reference signal. The triangle wave generator outputs a pair of complementary tri... | 09/15/1998 |
| 5767756 | Active quadrature power splitter An active quadrature power splitter having low power consumption is small in size and is inexpensive, for obtaining two output signals of which the phase difference is 90 degrees. Since the active quadrature power splitter operates as a microwave amplifie... | 06/16/1998 |
| 5635876 | Phase difference and amplitude correction circuit The correction circuit comprises a first quadrature phase comparator intended to receive as input two signals which are desired to be in quadrature and to have equal amplitudes. Phase adjustment means are firstly intended to correct the phase of at least ... | 06/03/1997 |
| 5608796 | Balanced phase splitting circuit Disclosed is an integrated circuit comprising a balanced set of inputs and a phase splitting circuit. The phase splitting circuit has a first input terminal that is coupled to the balanced set of inputs and a second input terminal that is coupled to the b... | 03/04/1997 |
| 5408192 | Monolithic broadband phase shifting circuit for analog data signals An accurate phase shifting circuit providing two analog signals having a 90-degree phase shift between them from a single sampled-data input without the need for components external to a monolithic integrated circuit. A combination of two discrete-time ci... | 04/18/1995 |
| 5285120 | Broadband phase splitter An electrical circuit provides a constant phase shift between two output signals derived from a common input. The output signals are designed to provide a constant phase shift at constant amplitude over a very large frequency range. The common input is pr... | 02/08/1994 |
