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7619486 |
Method for detecting and compensating for temperature effects
An integrated circuit fabricated in a multiple oxide process can be used to provide a temperature-insensitive circuit. The temperature-insensitive circuit can be a ring oscillator; this ring...
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7619484 |
Oscillator phase matching
A system comprises a primary oscillator that provides a first signal having a first phase and a backup oscillator that provides a second signal having a second phase. The system also comprises trim...
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7603095 |
Apparatus and method of switching intervals
The present invention provides a way of hysteretic switching for efficiently reducing the heavy switching between two adjacent coarse intervals. The present invention disposes a number of fine...
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7602254 |
System and method for generating signals with a preselected frequency relationship in two steps
System and method for generating multiple local oscillator signals comprising a first-stage phase-locked loop (PLL) having an input to receive a first reference signal input and having an output to...
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7602253 |
Adaptive bandwidth phase locked loop with feedforward divider
In some embodiments, a chip includes first and second sub phase lock loops (sub-PLLs) including first and second voltage controlled oscillators (VCOs) to provide first and second VCO output signals...
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7592876 |
Leakage oscillator based aging monitor
According to embodiments of the subject matter disclosed in this application, the age of a target circuit component in a semiconductor device may be monitored by using at least one aging leakage...
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7586382 |
Methods and systems for temperature related frequency drift compensation
Systems and methods are provided that compensate for frequency drift due to temperature variation without the need for a temperature sensor. In one embodiment, a navigation receiver with an...
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7586377 |
Real time clock
A real time clock assembly includes paired crystal oscillators that experience changes in frequency responsive to temperature. The differences in frequency changes between the paired crystal...
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7583773 |
Frequency synthesizing device with automatic calibration
A frequency synthesizer with automatic calibration includes a voltage-controlled oscillator, which has several working bands for receiving a coarse-tuned signal and a fine-tuned signal and...
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7581132 |
System and method for configuring a microcontroller clock system
A method is provided for configuring a microcontroller clock system that includes a main oscillator, a phase locked loop, and a backup oscillator. According to the method, the main oscillator and...
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7579916 |
Low noise frequency synthesizer
A frequency synthesizer comprising an input large step frequency source suitable for generating a large step frequency, a variable frequency source suitable for generating a small step frequency, a...
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7576617 |
Semiconductor integrated circuit device
A semiconductor integrated circuit device is disclosed that includes a signal processing unit having a nonvolatile memory and a detection unit; plural oscillation sources outputting plural...
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7570121 |
Frequency jittering control circuit and method for using the same
A frequency jittering control circuit wherein by means of the characteristics of a PLL whose input switches between different frequencies, the output frequency of the PLL swings between the...
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7567629 |
Multiphase clock recovery
The invention represents a parallel and distributed approach to clock recovery based on multiple mutually phase shifted sample clock signals (åS) defining a set of orthogonal clock phases. The...
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7567134 |
System and method for synchronizing multiple oscillators
A system and method for synchronizing an oscillator with multiple phases at a desired phase angle difference. A relative measure of a phase angle difference between two phases permits each phase to...
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7567131 |
Device for ultra wide band frequency generating
Devices ( 1 ) for exchanging ultra wide band signals comprise frequency translating stages ( 20,30 ) for frequency translating signals and oscillating stages ( 40 ) for supplying main...
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7564316 |
Variable-frequency oscillator incorporating thin-film bulk acoustic resonators
Variable-frequency oscillators incorporating thin-film bulk acoustic resonators (FBARs) are described. In one aspect, a variable-frequency oscillator includes a first oscillator circuit and a...
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7557662 |
Oscillator and frequency detector
In an oscillating apparatus or a frequency detecting apparatus in which a center frequency and a variable frequency range are freely or optionally established with a high stability and a high...
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7548121 |
Fractional frequency synthesizer and phase locked loop utilizing fractional frequency synthesizer and method thereof
A fractional frequency synthesizer, applied to a phase-locked loop, includes a phase detector, a loop filter, a controllable oscillator, a first frequency divider, and a sigma-delta modulator...
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7548120 |
Frequency switching method
A frequency switching method is used to make switching among a plurality of frequency signal sources each providing a specific frequency range covering multiple bands. The method includes steps of...
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7541878 |
Temperature compensated crystal oscillator
An apparatus, comprising: a first oscillator made from piezoelectric material to oscillate at a first frequency; a second oscillator to oscillate at a second frequency; a comparator to compare the...
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7538621 |
Broadband integrated tuner
A broadband integrated receiver for receiving input signals and outputting composite video and audio signals is disclosed. The receiver employs an up-conversion mixer and a down-conversion mixer in...
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7528665 |
Multiple frequency source system and method of operation
A multiple frequency source system includes at least one frequency source tunable to a predefined target frequency, and at least one additional frequency source operable to generate a second signal...
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7522686 |
CMOS burst mode clock data recovery circuit using frequency tracking method
Provided is a burst mode clock data recovery circuit for extracting clock information and data information from transmitted data to process data synchronized with clock. The circuit includes a...
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7516350 |
Dynamic frequency scaling sequence for multi-gigahertz microprocessors
The present invention provides for reducing current spikes in a circuit when changing clocking frequencies. A first frequency is applied to a clock distribution network. A final frequency is...
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7508272 |
Methods and systems to provide a plurality of signals having respective different phases
A system for generating multiple synthesized clocks having an input terminal for receiving a reference signal, a phase locked loop circuit coupled to the input signal terminal, where the phase...
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7508271 |
Semiconductor memory apparatus having phase locked loop
A semiconductor memory apparatus includes a PLL selector that selectively activates a plurality of PLL enable signals by decoding pluralities of PLL selection signals, and a plurality of PLL...
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7495516 |
Method of establishing an oscillator clock signal
A hybrid numeric-analog clock synchronizer, for establishing a clock or carrier locked to a timing reference. The clock may include a framing component. The reference may have a low update rate....
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7492849 |
Single-VCO CDR for TMDS data at gigabit rate
A clock and data recovery circuit has a voltage controlled oscillator that provides a clocking signal synchronized to a received serialized data. A multiple phase generator converts the clocking...
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7466140 |
Signal generation circuit, jitter injection circuit, semiconductor chip and test apparatus
There is provided a signal generation circuit for generating an output signal including jitter injected thereto. The signal generation circuit includes a jitter output section that outputs a first...
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7463103 |
Chaotic signal generator for ultra wide band communication system
In a chaotic signal generator, a first signal generator generates a first signal. The first signal includes a first fundamental wave having a preset first frequency and a plurality of harmonic...
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7463096 |
Dynamic voltage and frequency management in integrated circuits
This invention discloses a system and method for dynamically managing voltage and frequency in an integrated circuit (IC), comprising a plurality of ring oscillators for generating a plurality of...
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7453323 |
Circuit, control system, IC, transmitting and receiving apparatus, control method and program
The present invention provides a circuit, a control system, an IC, a transmitting and receiving apparatus, a control method, and a program which can reduce a phase error and simultaneously suppress...
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7449961 |
Parallel controlled connections of the plurality of ring oscillator units, PLL, radio apparatus
An oscillator includes a plurality of oscillating units connected in parallel with each other, and a control unit which controls the number of parallel connections of the plurality of oscillating...
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7439813 |
Method and system for generating carrier frequencies for UWB application
Apparatus and method for generating first, second and third carrier frequencies of 3432 MHz, 3960 MHz and 4488 MHz respectively, for use in a wireless transmission system deploy only first and...
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7427901 |
Oscillator array, and synchronization method of the same
Signals outputted from oscillators ( 1 - 1, 1 - 2, . . . 1 - n ) are in phase with signals as reflected by band elimination filters ( 3 - 1, 3 - 2, . . . 3 - n ) at elimination frequencies of the...
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7414490 |
Dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing
Disclosed is a dual-band voltage-controlled oscillator using bias switching and output-buffer multiplexing. The dual-band voltage-controlled oscillator includes a power supply unit for supplying a...
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7414489 |
Phase controlled oscillator circuit with input signal coupler
An oscillating signal in an oscillator is caused to phase shift toward the phase of an input signal coupled to the oscillating signal. The resonant frequency of the oscillator is about equal to an...
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7411464 |
Systems and methods for mitigating phase jitter in a periodic signal
An oscillator circuit can generate a periodic signal, and a frequency adjustment circuit can adjust the frequency of the periodic signal. The periodic signal may include phase jitter. In one aspect...
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7405627 |
PLL frequency synthesizer
In a PLL frequency synthesizer outputting signals with different frequencies: voltage-controlled oscillators output the signals and have the oscillation frequencies controlled according to control...
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7397311 |
Oscillator coupling to reduce spurious signals in receiver circuits
A first receiver frequency reference is passively coupled to a second receiver by tapping a signal directly from the resonant element, such as a crystal, of an oscillator in the first receiver to...
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7394321 |
Quadrature VCO system and method
A low-power quadrature generator is provided for accurately generating in-phase signals and quadrature signals.
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7389192 |
Determining data signal jitter via asynchronous sampling
A method for determining data signal jitter via asynchronous sampling provides a low cost and production-integrable mechanism for measuring data signal jitter. The data signal is edge-detected and...
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7383160 |
Method and apparatus for constructing a synchronous signal diagram from asynchronously sampled data
A method a low cost and production-integrable technique for providing a signal diagram. The data signal is edge-detected and asynchronously sampled (or alternatively a clock signal is latched). The...
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7356111 |
Apparatus and method for fractional frequency division using multi-phase output VCO
A phase-locked loop (PLL) frequency synthesizer capable of being tuned in small step sizes. The PLL frequency synthesizer includes a PLL circuit. A phase-locked loop (PLL) frequency synthesizer...
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7355490 |
Receiver having no tracking error
A receiver includes an up/down counter that controls turning on/off of individual switching units, and a count signal generator that compares a control voltage with a first reference voltage and a...
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7355483 |
System and method for mitigating phase pulling in a multiple frequency source system
A method for mitigating phase pulling in multiple frequency source system includes generating a first signal, the first signal referred to as an existing signal operating at an existing frequency...
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7355482 |
Methods and apparatus for compensating a variable oscillator for process, voltage, and temperature variations using a replica oscillator
Circuits and methods for compensating a variable oscillator for process and/or operational variations. The circuit generally comprises (a) a replica oscillator, (b) a counter configured to count...
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7342465 |
Voltage-controlled oscillator with stable gain over a wide frequency range
An apparatus and method for providing a stable gain over wide frequency range in a VCO are presented. A VCO uses a waveform generator along with a bias generator having a frequency select input....
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7333779 |
PLL circuit and radio communication terminal apparatus using the same
In a PLL circuit, the number of LPFs is reduced to one to reduce mounting area and pin number, and to simplify design. In one embodiment, the PLL circuit includes a variable-gain phase comparator,...
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