Did You Know...
...that while attempting to develop a super strong glue, 3M employee Spencer Silver accidentally developed a glue that was so weak it would barely hold two pieces of paper together? However, his colleague Art Fry needed the glue. Fry sang with his church choir and marked the pages of his hymnal with small scraps of paper that often fell out. He used Silver's glue to hold the papers in place. Today we call this invention Post-it Notes.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7750708 | Circuit arrangement for generating a complex signal and the use of this circuit arrangement in a high-frequency transmitter or receiver A circuit arrangement for generating an IQ signal which comprises an oscillator (3) and a frequency divider (4). The oscillator (3) and the frequency divider (4) are arranged in a common current path between the supply and reference poten... | 07/06/2010 |
| 7705650 | System and method for effectively implementing an IQ generator A system and method for effectively implementing an IQ generator includes a master latch that generates an I signal and a slave latch that generates a Q signal. The master latch includes a master data circuit, a master latch circuit, and a master clock circuit. The ... | 04/27/2010 |
| 7598787 | Signal generation apparatus, frequency converting apparatus, and receiver A signal generation apparatus, a frequency converting apparatus and a receiver, in which the signal generation apparatus includes an oscillator, a duty cycle adjusting circuit, and a signal generation circuit. The oscillator generates differential signals. The duty ... | 10/06/2009 |
| 7576584 | Clock generators for generation of in-phase and quadrature clock signals Clock generator embodiments are provided to generate half-rate I and Q clock signals. The generators are configured to insure fan-out limitations, to insure correct phasing at startup, to reduce the number of signal inverters in a critical path, and to reduce the to... | 08/18/2009 |
| 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 |
| 7298222 | 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... | 11/20/2007 |
| 7282979 | Phase shifting device A phase shifting device includes a signal source; a variable phase shifter; first and second doubling circuits; and a 90-degree phase comparator. An output from the signal source is connected to an input of the variable phase shifter and to an input of the second do... | 10/16/2007 |
| 7276949 | Multiphase clock generation A first-phase clock signal is generated in response to a first input clock signal. A second-phase clock signal is generated one clock cycle of the first input clock signal after generating the first-phase clock signal in response to the first input clock signal. A t... | 10/02/2007 |
| 7233187 | Dual-mode pulse generator A pulse generator electrical circuit capable of operating as both a clock-based pulse generator and a delay-based pulse generator while minimizing the limitations of these two types of pulse generators is disclosed. When the pulse generator operates in “delay mode... | 06/19/2007 |
| 7184715 | Tuning a station A method of tuning a station is disclosed, wherein a first pilot signal is applied on a circuit of the station and the resulting output power of the signal circuit is subsequently detected. A second pilot signal is then applied to the circuit and the resulting outpu... | 02/27/2007 |
| 7181186 | Mixer and frequency conversion apparatus for improving phase-mismatching A frequency conversion apparatus having a mixer eliminates phase miss-matching between two intermediate frequency (IF) signals having the same frequency and a 90 degree difference in phase. The frequency conversion apparatus for compensating for phase mismatching of... | 02/20/2007 |
| 7151919 | Method for forming an intermediate frequency signal in a mixer, and a mixer The invention relates to a method for forming at least two intermediate frequency signals with different phases in a mixer (1), to which a first signal (RF) and a second signal (LO) are conducted. According to the method, the first intermediate frequency sign... | 12/19/2006 |
| 7146150 | Mixing circuit with low noise factor when operating at low frequency The invention relates to a mixing circuit for mixing a first signal RF with a second signal LO including a conversion stage T3 to convert the first signal RF into a current, a mixing core T1 and T2 to mix said current with the second signal LO, ... | 12/05/2006 |
| 7129765 | Differential clock tree in an integrated circuit A clock distribution network having: a main trunk configured to provide a differential clock signal; a plurality of branches coupled to the main trunk for distributing the differential clock signal to a plurality of circuit elements on the integrated circuit; and a ... | 10/31/2006 |
| 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 |
| 7119570 | Method of measuring performance of a semiconductor device and circuit for the same A test circuit to test rise delay/fall delay performance on a semiconductor device may comprise a latch to latch data at its input responsive to a clock signal. The latch may source an output signal related to the data latched. A buffer chain may be configured to se... | 10/10/2006 |
| 7081783 | Method and apparatus for generating and controlling a multiphase clock Multiphase clock generating apparatus includes a multiplexer selecting one of a generated clock and a gated generated clock as an M-clock in accordance with a halt multiplexer control. Divider circuitry provides an alignment signal corresponding to an inverted M-clo... | 07/25/2006 |
| 7075351 | Method and apparatus for generating a multiphase clock A multiphase clock generating apparatus includes a clock generator providing an M-clock having a frequency M times that of a received reference clock. Divider circuitry is coupled to provide an alignment signal having 1/M the frequency of the M-clock. A recovery cir... | 07/11/2006 |
| 7071750 | Method for multiple-phase splitting by phase interpolation and circuit the same The invention relates to a method and related circuitry for multiple phase-splitting. The method includes: while generating M output clocks with a same frequency f1 and different phases, generating N reference clocks with a same frequency (M/N)*f1 and ... | 07/04/2006 |
| 7068090 | Amplifier circuit An amplifier circuit includes a CMOS inverter circuit that eliminates a DC offset caused by variations in characteristics of elements in each manufacturing process and is thus applicable to analog signal processing. The CMOS inverter circuit includes a PMOS transist... | 06/27/2006 |
| 6995595 | Direct conversion receiver having a DC offset eliminating function A direct conversion receiver having a DC offset eliminating function that eliminates a DC offset component in which an oscillator generates a local frequency signal, A first phase shifter shifts a phase of the local frequency signal from the oscillator by 90°, a fi... | 02/07/2006 |
| 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 |
| 6982584 | Phase quadrature and slaved working frequency signal generator An in phase quadrature signal generator including a phase shifter (1) that receives at an input terminal (2) an input signal (Vin) supplied to phase shifting means (3,4) formed of passive elements, arranged for delivering at first and second out... | 01/03/2006 |
| 6963236 | Method and apparatus for generating and controlling a quadrature clock Quadrature clock generating apparatus includes a multiplexer selecting one of a generated clock and a gated generated clock as a double clock in accordance with a halt multiplexer control. Divider circuitry provides an alignment signal corresponding to an inverted d... | 11/08/2005 |
| 6919750 | Clock signal generation circuit used for sample hold circuit A master DLL circuit (3) generates a first delay signal (CKD) by delaying the master clock signal by a first delay time (T0) and generates a first pulse signal (Smp) having a pulse width (T0) of the first delay time, and generates a first contro... | 07/19/2005 |
| 6917232 | Method and apparatus for generating a quadrature clock A quadrature dock generating apparatus includes a clock generator providing a double clock having a frequency that is twice that of a received reference clock. Divider circuitry is coupled to provide an alignment signal having half the frequency of the double clock.... | 07/12/2005 |
| 6903591 | Phase shifter circuit A phase shift circuit that generates a phase shift signal whose amplitude matches at a plurality of frequencies without increasing the circuit area. The phase shifter circuit includes first and second differential amplifiers which generate first and second first pha... | 06/07/2005 |
| 6891440 | Quadrature oscillator with phase error correction A quadrature oscillator with phase error correction including a local oscillator that generates a single-ended clock signal, a single-ended to differential converter that converts the clock signal to a differential clock signal, a quadrature generator that converts ... | 05/10/2005 |
| 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 |
| 6831497 | Active quadrature signal generator using load having low-pass and high-pass filter characteristics An active quadrature signal generator produces poly-phase quadrature signals necessary in high frequency transmit and receive elements of a communication system. The quadrature signals are produced using the phase difference between a load representing a low-pass fi... | 12/14/2004 |
| 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 |
| 6812763 | Automatic wideband quadrature frequency generator When two sine-wave signals in quadrature, the integral of the output is equal to zero. Conversely, when an in-phase signal is inputted as one multiplicand and the output is set to zero, a quadrature signal is derived from the second multiplicand automatically. Any a... | 11/02/2004 |
| 6768364 | Quadrature signal generation with phase error correction A quadrature signal generator includes a polyphase filter where four resistive elements and four variable capacitive elements are connected alternately in series to form a loop; and a phase corrector that variably controls the capacitance of the variable capacitive ... | 07/27/2004 |
| 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 |
| 6680639 | Phase shifting arrangement for generating mutually orthogonal signals The present invention is directed to a phase shifting arrangement for generating a set of mutually orthogonal signals. In one aspect, the invention provides a system that includes a phase shifting unit for receiving an input signal. The phase shifting uni... | 01/20/2004 |
| 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 |
| 6665353 | Quadrant switching method for phase shifter An apparatus comprising a quadrature network, an RF combining circuit and a weighting network. The quadrature network may be configured to generate a first and a second signal in response to an input signal. The RF combining circuit may be configured to g... | 12/16/2003 |
| 6661851 | Bi-directional vector rotator A bi-directional vector rotator that can be used to provide outputs having phases that are rotated in clockwise and counter clockwise directions relative to that of the input signal. The bi-directional vector rotator includes a product term generator that... | 12/09/2003 |
| 6597747 | Baseband signal processing circuit capable of accurately setting phase difference between analog I signal and analog Q signal to 90 degrees The time interval between the rise time or fall time of a first clock signal which is used to convert a digital signal into an analog signal and the rise time or fall time of a second clock signal which is used to convert the digital signal into an analog... | 07/22/2003 |
| 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 |
