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| Number | Title | Issue Date |
| 8174326 | Phase lock loop control error selection system and method In one embodiment, a cross zero best error selection system includes an error input interface, a most significant bit summation component and a multiplexer. The error input interface in coupled to a most significant bit summation component which in turn is coupled t... | 05/08/2012 |
| 8044725 | Signal generator with directly-extractable DDS signal source A signal generator including a DDS-signal source that is configured to operate according to the principle of direct digital synthesis (DDS), and a PLL signal synthesizer that is configured to operate according to the principle of phase locked loop (PLL) using an out... | 10/25/2011 |
| 7755439 | Phase locked loop circuit performing two point modulation and gain calibration method thereof A PLL circuit for two point modulation includes a first loop filter, a second loop filter, a plurality of switching devices, and a calibration module. The first loop filter filters an output voltage of a charge pump during a gain calibration operation. The second lo... | 07/13/2010 |
| 7482883 | Gain normalization of a digitally controlled oscillator in an all digital phase locked loop based transmitter A novel mechanism for gain normalization of a digitally controlled oscillator (DCO) in an all digital phase locked loop (ADPLL)-based transmitter that is operative to split the gain normalization multiplication functionality between a modulating path and a PLL loop.... | 01/27/2009 |
| 7443261 | Phase modulating apparatus, communication device, mobile wireless unit, and phase modulating method A multimode-based phase modulating apparatus capable of reducing the degradation of modulation precision and suppressing the unnecessary power consumption. This apparatus has a switch for switching the modulation modes of a PLL circuit between a single-point modulat... | 10/28/2008 |
| 7436263 | Apparatus and method for presenting a modulated output signal at an output locus An apparatus that presents an output signal that is modulated by input signal includes: (a) A signal source providing a signal at a reference frequency. (b) A frequency comparer coupled with the signal source and the output signal for comparing the extant output sig... | 10/14/2008 |
| 7420433 | Phase lock loop RF modulator system A phase lock loop RF modulator system including a phase lock loop circuit having a phase detector circuit responsive to an input reference signal and a feedback signal, an oscillator circuit responsive to the phase detector circuit for providing an output signal, a ... | 09/02/2008 |
| 7417514 | Method for modulating phase or frequency in a communication system using clock division A direct division modulator is provided. The direct division modulator includes a symbol mapper converting the input data from a binary bitstream to a desired frequency deviation, such as where the frequency deviation data encodes the information from the bitstream.... | 08/26/2008 |
| 7411469 | Circuit arrangement A circuit arrangement having a plurality of variable capacitance elements such as varactors is described, the varactors having associated electronic control means which controls the capacitance of the variable capacitance elements over a control range. The control r... | 08/12/2008 |
| 7408418 | Phase locked loop circuit having reduced lock time A phase locked loop circuit comprising a phase detector having a first input for receiving a first frequency signal and an output, a first filter adapted to filter the output electric signal of the phase detector, a voltage controlled oscillator adapted to generate ... | 08/05/2008 |
| 7391270 | Phase locked loop and method for phase correction of a frequency controllable oscillator A phase locked loop is disclosed and includes a frequency divider circuit with a settable division ratio in a feedback path. The division ratio is produced using a control circuit which, besides an input for supplying the integer and fractional components for the fr... | 06/24/2008 |
| 7382201 | Signal generating apparatus and method thereof A signal generating apparatus is disclosed for generating a synthesized signal according to an input signal, the signal generating apparatus includes a phase-locked loop device for generating the synthesized signal; a control unit for controlling the control signal ... | 06/03/2008 |
| 7378918 | Two-point modulation type phase modulation apparatus, polar modulation transmission apparatus, wireless transmission apparatus and wireless communication apparatus There provides a two-point modulation phase modulation apparatus capable of obtaining an RF phase modulation signal of superior modulation precision with low power consumption and a simple configuration even in the event of inputting a wide band baseband modulation ... | 05/27/2008 |
| 7372337 | Voltage controlled oscillator comprising an injection pulling compensation circuit The present invention relates to a method for stabilising the operation of a voltage controlled oscillator driven by a phase locked loop, the voltage controlled oscillator delivering an RF signal and receiving through at least one spurious path a harmonic component ... | 05/13/2008 |
| 7358825 | Variable capacitance circuit arrangement A variable capacitance network is disclosed, comprising a plurality of capacitance arms connected in parallel with each other between first and second terminals of the network. Each capacitance arm has a varactor and a series capacitor in series with the varactor A ... | 04/15/2008 |
| 7352250 | Phase locked loop circuits, offset PLL transmitters, radio frequency integrated circuits and mobile phone systems A PLL circuit equipped with a loop gain detecting circuit that can suppress the change of the loop gain. When detecting the loop gain, the frequency of the input signal to the second input (IN-2) of the phase detector is first changed, and the response corres... | 04/01/2008 |
| 7349516 | Method for trimming a two-point modulator, and a two-point modulator having a trimming apparatus A PLL circuit (1) is regulated by means of a digital modulation signal (28) at a first frequency, and is then regulated at a second frequency, by deactivation of the digital modulation signal (28). A difference signal (32), which is chara... | 03/25/2008 |
| 7333582 | Two-point frequency modulation apparatus, wireless transmitting apparatus, and wireless receiving apparatus A two-point frequency modulation apparatus is provided that reduces input timing difference and improves modulation accuracy. Two-point frequency modulation apparatus 10 has: PLL circuit 11; frequency division ratio generator 13 that generates t... | 02/19/2008 |
| 7333789 | Wide-band modulation PLL, timing error correction system of wide-band modulation PLL, modulation timing error correction method and method for adjusting radio communication apparatus having wide-band modulation PLL A broadband modulation PLL includes a PLL portion containing a voltage controlled oscillator (101), a frequency divider (105), a phase comparator (104) and a loop filter (103). A frequency-dividing ratio of the frequency divider (105 | 02/19/2008 |
| 7292107 | Modulation method and apparatus with adjustable divisors of the dividers in phase-locked loop A modulation method and a modulation apparatus in a phase-locked loop (PLL) provided. The modulation apparatus comprises a modulator, a crystal oscillator, a controllable R-divisor frequency divider, a controllable N-divisor frequency divider and a voltage-controlle... | 11/06/2007 |
| 7292118 | Modulator A modulator according to the invention includes: a PLL circuit that detects a phase difference between an input signal and a reference signal, an AGC circuit that controls a gain of a modulating signal and outputs a control signal, and a voltage controlled oscillati... | 11/06/2007 |
| 7288999 | Pre-distortion system for a synthesizer having modulation applied in the reference path A system providing a phase or frequency modulated signal is provided. In general, the system includes a phase locked loop (PLL) having a fractional-N divider in a reference path of the PLL operating to divide a reference frequency based on a pre-distorted modulation... | 10/30/2007 |
| 7272201 | System for synchronous sampling and time-of-day clocking using an encoded time signal The system for synchronous sampling uses an encoded time signal, such as an IRIG-B signal. The IRIG-B signal is applied to an edge detector, which produces pulses based on the edges of the encoded time signal. These signals are applied to a phase-locked-loop assembl... | 09/18/2007 |
| 7245685 | Filtering for timing distribution system in networking products A timing distribution apparatus. The apparatus includes a source for producing a signal. The apparatus includes a first filter for removing jitter from the signal. The apparatus includes a second filter for removing wander from the signal separate and apart from the... | 07/17/2007 |
| 7224237 | Modulator and correction method thereof The invention concerns a wideband modulator using a PLL synthesizer, which can match the frequency characteristic and prevent degradation in modulation accuracy even in the presence of a variation in the manufacture of circuit components. In a wideband modulator whi... | 05/29/2007 |
| 7209016 | Variable capacitance circuit arrangement A circuit arrangement having a plurality of variable capacitance elements such as varactors is described, the varactors having associated electronic control means which controls the capacitance of the variable capacitance elements over a control range. The control r... | 04/24/2007 |
| 7205850 | Communication semiconductor integrated circuit device and a wireless communication system In a communication semiconductor integrated circuit device using offset PLL architectures and including an oscillator circuit and a frequency divider circuit generating an intermediate frequency signal, the oscillator circuit includes an oscillator, a programmable f... | 04/17/2007 |
| 7206339 | Wonder generator, digital line tester comprising the same, and phase noise transfer characteristic analyzer A wander generator has a random number signal generator unit, a filter unit, a clock generator unit, a modulator unit, and a setting unit. The random number generator unit sequentially generates random number signals comprised of a plurality of bits at a constant sp... | 04/17/2007 |
| 7187247 | Variable capacitance circuit arrangement A variable capacitance network is disclosed, comprising a plurality of capacitance arms connected in parallel with each other between first and second terminals of the network. Each capacitance arm has a varactor and a series capacitor in series with the varactor A ... | 03/06/2007 |
| 7180385 | Direct frequency modulation system having an IQ mixer in the phase locked loop A transmission arrangement includes a step-up frequency mixer that converts a modulation signal to a transmission frequency. The step-up frequency mixer is arranged within a phase locked loop that further comprises a frequency divider that is likewise supplied with ... | 02/20/2007 |
| 7176669 | Switching regulator with frequency modulation to vary frequency based on a load condition, and control method therefor In a frequency modulation type switching regulator for producing an output voltage to a load, an error amplifier produces an error voltage indicative of a difference between the output voltage and a reference voltage. A switching device is turned on and off at a swi... | 02/13/2007 |
| 7173493 | Range controller circuit and method A range controller circuit has a master counter with a recovered clock input. A sampled counter has a reference clock input. A link fault indicator logic is coupled to an output of the master counter and an output the sampled counter. ... | 02/06/2007 |
| 7170358 | Voltage controlled oscillator, and PLL circuit and wireless communication apparatus using the same A voltage controlled oscillator comprises a parallel resonance circuit including an inductor circuit, a variable capacitance circuit, and a high-frequency switch circuit, a negative resistance circuit and a frequency control section, and a frequency tuning sensitivi... | 01/30/2007 |
| 7154347 | Compensating method for a PLL circuit that functions according to the two-point principle, and PLL circuit provided with a compensating device A PLL circuit is tuned to a first frequency by using a first digital modulation signal and subsequently tuned to a second frequency by using a second digital modulation signal. A differential signal, that is a function of the change in voltage of a VCO control signa... | 12/26/2006 |
| 7145398 | Coarse frequency detector system and method thereof An improved coarse frequency detector includes a first storage device responsive to a data signal and a sub-multiple of a clock signal for detecting a first transition in the data signal during a predetermined state of the sub-multiple of the clock signal and genera... | 12/05/2006 |
| 7142070 | Two-point modulator arrangement A two-point modulator arrangement is specified, said arrangement being developed with respect to conventional two-point modulators to the effect that the high-pass coupling-in point of the modulator that comprises a phase locked loop is formed by an expanded loop fi... | 11/28/2006 |
| 7129788 | Method and apparatus for driving a direct current or voltage controlled oscillator with modulation slope feedback A d.c. signal controlled oscillator includes a frequency-determining network having a control input and a modulation input. A phase regulating loop includes the oscillator and components that provide a control signal to the control input. A circuit apparatus for dri... | 10/31/2006 |
| 7113047 | Clock generator and its control method To present a clock generator capable of spreading the spectrum of oscillation frequency by simple control in a small additional circuit, and its control method. A phase locked loop circuit is provided from a frequency phase comparator 11, an output clock sign... | 09/26/2006 |
| 7109805 | Direct modulator for shift keying modulation A system for direct modulation is disclosed. Embodiments of the direct modulator for shift-keying modulation include impressing baseband data on a radio frequency (RF) signal at an oscillator by controlling a digital divider using a sigma-delta modulator. ... | 09/19/2006 |
| 7103127 | System for controlling the frequency of an oscillator Systems for controlling the frequency of the output signal of a controllable oscillator in a frequency synthesizer are provided. One such system comprises a controllable oscillator and a frequency control circuit. The controllable oscillator is configured to generat... | 09/05/2006 |
