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US20140266318 PHASE INTERPOLATOR BASED OUTPUT WAVEFORM SYNTHESIZER FOR LOW-POWER BROADBAND TRANSMITTER  
Exemplary embodiments of the present invention relate to an output waveform synthesizer using phase interpolators and an on-chip eye opening monitoring (EOM) circuit for a low-power transmitter....
US20150229294 VOLTAGE CONTROLLED IMPEDANCE SYNTHESIZER  
A voltage controlled impedance synthesizer providing stepwise variable impedance values according to a prescribed function of the control voltage, said synthesizer comprises of one or more...
US20130307588 PLL BANDWIDTH CORRECTION WITH OFFSET COMPENSATION  
A method and system for compensating for offsets when measuring parameters of a phase-locked loop (PLL). In one embodiment, a proportional path in the PLL is temporarily shut off, a measurement is...
US20110080191 System and Method for Clock-Synchronized Triangular Waveform Generation  
A triangular waveform generator is converted to a free running oscillator controlled by a calibration code. The free running oscillator can be synchronized to an external clock signal by comparing...
US20130321031 CMOS PROGRAMMABLE NON-LINEAR FUNCTION SYNTHESIZER  
The CMOS programmable non-linear function synthesizer utilizes CMOS current-mode electronics to provide synthesis of arbitrary analog functions. The circuit approximates a seventh-order Taylor...
US20110032005 Frequency synthesizer  
A frequency synthesizer in which a satisfactory frequency stability can be obtained over the entire long period of service immediately after power activation is disclosed. The reference signal...
US20090167366 Audio clock regenerator with precise parameter transformer  
It is difficult to implement a conventional phase lock loop circuit in a sink device within an HDMI system because the low frequency input causes the conventional phase lock loop circuit to absorb...
US20150214968 FRACTIONAL N FREQUENCY SYNTHESIZER AND SETTING METHOD THEREOF  
The calculator calculates the remainder of the division of which the dividend is the minimum accumulated value at which a carryover occurs in the ΔΣ modulator and the devisor is a fractional set...
US20120001660 SOFTWARE-DEFINED RADIO  
Present software-defined radios (SDR) employ front end circuits that contain multiple receivers and transmitters for each band of interest, which is inflexible, expensive and power inefficient. A...
US20110291706 ELIMINATION OF FRACTIONAL N BOUNDARY SPURS IN A SIGNAL SYNTHESIZER  
A portable frequency synthesizer is provided with fine tuning over a broad bandwidth using a Fractional N type Delta Sum Phase Locked Loop circuit that enables elimination of boundary value spurs....
US20120249187 CURRENT SOURCE CIRCUIT  
According to one embodiment, a current source circuit comprises a first circuit, a second circuit, and a current synthesizing circuit. The first circuit generates a first current having a positive...
US20100308871 DELAY CHAIN CIRCUIT  
A delay chain circuit including at least two delay elements, wherein each delay element is configured to: receive a first signal; output a second signal after a delay period; and be operable in at...
US20140191782 ON-CHIP R AND C CALIBRATION USING ON-BOARD SUPPLY BYPASS CAPACITANCE  
A technique for calibration of on-chip resistance (R) and capacitance (C) values using an on-board bypass capacitor may include configuring an on-chip switch to selectively couple an on-chip...
US20100019805 VOLTAGE SYNTHESIS USING VIRTUAL QUADRATURE SOURCES  
Voltage synthesis using virtual quadrature sources may be provided. First, a quadrature wave form may be created. The quadrature wave form may have the same frequency as an input voltage and may...
US20130259103 DIGITAL DELTA SIGMA MODULATOR AND APPLICATIONS THEREOF  
A digital delta sigma modulator includes an input integration stage, a resonating stage, a quantizer, and a plurality of feedback paths operably coupled to the quantizer, the input integration...
US20110074469 Frequency Generation Circuitry And Method  
A method includes generating a plurality of reference phases of a reference signal and selecting a sub-phase from each of the plurality of reference phases to form a set of selected sub-phases. In...
US20100073035 SYNCHRONOUS FREQUENCY SYNTHESIZER  
An apparatus for clock generation is presented. In one embodiment, the apparatus comprises a phase interpolator that generates an output with a phase value within reference phases associated with...
US20090184736 FLEXIBLE WAVEFORM GENERATOR WITH EXTENDED RANGE CAPABILITY  
A frequency synthesizer includes a first clock running at a frequency fCLK1, a second clock running at a frequency fCLK2, wherein frequency fCLK2 is higher than frequency fCLK1, the frequencies...
US20110304361 TIME-TO-DIGITAL CONVERTER WITH CALIBRATION  
Time-to-digital converter arrangements and corresponding methods as well as applications thereof are described. The time-to-digital converter in a first mode is coupled with a calibration signal...
US20140197867 Circuits and Methods for Using a Flying-Adder Synthesizer as a Fractional Frequency Divider  
An open loop clock divider circuit includes (a) a first divider configured to receive an incoming clock signal and output a first divided clock signal, (b) a flying-adder synthesizer configured to...
US20090045850 RTWO-BASED DOWN CONVERTER  
A multiphase mixer using a rotary traveling wave oscillator is disclosed. In addition to the oscillator, the mixer includes first and second mixer circuits. The rotary traveling wave oscillator...
US20080191749 CLOCK DIVIDER WITH A RATIONAL DIVISION FACTOR  
This disclosure can provide methods, apparatus, and systems for dividing an input clock or master clock by an integer or non-integer divisor and generating one or more balanced, 50% duty cycle,...
US20140379333 WAVEFORM RESYNTHESIS  
A wave resynthesis method and system comprises receiving input wave form, processing received data to create an enhanced wave form, identifying the enhanced wave form, transmitting the identified...
US20080284470 Direct Digital Synthesizer and Nuclear Magnetic Resonance Instrument Using the Same  
A DDS (direct digital synthesizer) remarkably increased in the number of frequencies which can be output while maintaining the phase coherency, and an NMR instrument using such a DDS are provided....
US20090302896 SIGNAL CONDITIONING CIRCUIT WITH A SHARED OSCILLATOR  
A circuit for signal conditioning including a first stage with a digital/analog converter, a second stage with an I/Q-modulator, and at least one third stage with a mixer. Instead of a...
US20050093584 Fast-hopping frequency synthesizer  
A frequency synthesizer is disclosed. The frequency synthesizer comprises a fixed frequency generator configured to generate a fixed frequency signal, a variable frequency generator configured to...
US20060186931 Method for locking a synthesised output signal of a synthesised waveform synthesiser in a phase relationship with an input signal, and a digital waveform synthesiser for producing a synthesised output signal in a phase relationship with an input signal  
A digital waveform synthesiser (1) is implemented as a single chip integrated circuit on a single chip (2) and comprises a direct digital synthesiser (10) which produces a synthesised output...
US20100079173 Synthesized Local Oscillator And Method Of Operation Thereof  
A method for controlling a synthesized local oscillator (SLO) includes: receiving a control input specifying a desired SLO output; receiving reference clock signal; generating a predefined set of...
US20110183639 SAMPLING CIRCUIT AND RECEIVER USING SAME  
Disclosed are a sampling circuit and a receiver having a high flexibility of the filter design and excellent characteristics for removing an interfering wave. Provided also are a sampling circuit...
US20080074154 LOW-JITTER SPREAD-SPECTRUM CLOCK GENERATOR  
A spread-spectrum clock generator includes: a phase interpolator mixing a plurality of clock signals, which differ from each other in phase, and modulating a clock signal resulting from mixing the...
US20110084732 UNIVERSAL CMOS CURRENT-MODE ANALOG FUNCTION SYNTHESIZER  
The universal CMOS current-mode analog function synthesizer is based on approximating the required function using its sixth-order Taylor series expansion. These approximations can be implemented...
US20110199127 Phase Accumulator Generating Reference Phase for Phase Coherent Direct Digital Synthesis Outputs  
A phase accumulator generates phase data for a direct digital synthesis (DDS) device based on a reference phase to provide analog sinusoidal outputs that are locked to the reference phase and thus...
US20120081155 Dual-Mode Voltage Controlled Oscillator, Frequency Synthesizer and Wireless Receiving Device  
The invention provides a dual-mode voltage-controlled oscillator (DMVCO), a frequency synthesizer and a wireless receiving device, and pertains to the technical field of integrated circuit of...
US20110319036 Apparatus and Method for Digitally Controlling Capacitance  
An oscillator circuit having a source of an oscillating signal, a tank circuit including an inductor and a capacitor, and a discretely switchable capacitance module configured to control an amount...
US20080074155 SYNTHESIZING ARBITRARY WAVEFORMS USING CONVOLUTION PROCESSORS  
A method for generating a synthesized waveform from a desired arbitrary waveform via a convolution processor includes: providing a data stream input signal to the convolution processor including...
US20140184274 FRACTIONAL-N FREQUENCY SYNTHESIZER WITH LOW QUANTIZATION NOISE  
A fractional-N frequency synthesizer with low quantization noise includes a phase frequency detector, a charge pump, a loop filter, a voltage controlled oscillator a divider and a Delta-Sigma...
US20100079174 FREQUENCY SYNTHESIZER AND METHOD FOR SYNTHESIZING FREQUENCY  
A frequency synthesizer includes a multi-signal comparing phase frequency detector/converter, a loop filter, a controllable oscillator, and a frequency divider. The multi-signal comparing phase...
US20130154690 NESTED DIGITAL DELTA-SIGMA MODULATOR  
Methods and systems are disclosed that provide a radio frequency synthesizer that generates precise frequencies over a large radio frequency range. The radio frequency synthesizer can provide a...
US20080231328 Method and Circuit for Local Clock Generation and Smartcard Including it Thereon  
One delay circuit is inserted in open loop inside a clock recovery circuit for improving the accuracy of clock recovery. One oscillator signal φ(0) to φ(2i-1) is provided with a basic Step of...
US20070164793 Apparatus for generating clock pulses using a direct digital synthesizer  
The present invention relates to an apparatus for generating clock pulses using a Direct Digital Synthesizer (DDS). The present invention seeks to solve the problems of the conventional clock...
US20080238495 FREQUENCY SYNTHESIZER AND WIRELESS COMMUNICATION DEVICE UTILIZING THE SAME  
A frequency synthesizer includes a voltage-controlled oscillator to output an oscillation signal of a oscillating frequency in correspondence with a oscillation controlling voltage that is input...
US20090289667 Clock Generation Using a Fractional Phase Detector  
Circuits are provided that generate from an input signal one or more output clock signals having reduced skew. The input signal has transitions derived from the transitions of an original clock...
US20090015296 DIGITAL FREQUENCY SYNTHESIZER AND METHOD THEREOF  
A digital frequency synthesizer and a method thereof are provided. In the digital frequency synthesizer, a plurality of multiphase signals (MPSs) is generated by a phase delay locked loop array,...
US20100013521 SYNTHESIZER FOR DOHERTY AMPLIFIER  
A synthesizer is constructed by constituting a first λ/4 line of a first strip line and by constituting a second λ/4 line of a second strip line, so that it is formed into a chip shape (or a chip...
US20090028217 Ultra-wideband (UWB) frequency synthesizer system and method  
An ultra-wideband (UWB) frequency synthesizer is provided for use in UWB communication. The UWB frequency synthesizer may include a first section and a second section. The first section may be...
US20050212565 Single-chip digital phase frequency synthesiser  
An inexpensive, reliable and high quality digital phase frequency synthesis method and circuit providing universal transmission synchronizer for wireless, optical, or wireline transmission systems...
US20100045348 OSCILLATOR, TRANSMITTER-RECEIVER AND FREQUENCY SYNTHESIZER  
An output terminal 6 is provided at the connecting point 5 between the collector terminal of a transistor 1 and an open-ended stub 4 by connecting the open-ended stub 4 to the collector terminal...
US20090081984 METHOD AND APPARATUS FOR SPUR REDUCTION IN A FREQUENCY SYNTHESIZER  
A frequency synthesizer includes: a frequency source generating a reference signal that includes a plurality of pulses having periodicity based on a reference frequency; a feedback loop that...
US20090033374 Clock generator  
A frequency divider, comprising an input for receiving an input clock signal having a first frequency; a divider, for generating an output signal having an instantaneous frequency equal to the...
US20130241600 RANDOM SPREAD SPECTRUM MODULATION  
Representative implementations of devices and techniques provide a spread spectrum clocking signal. In a frequency synthesizer, a sequence of values may be generated and used to modulate a...
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