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7394328 |
Oscillator circuit and test apparatus
An oscillator circuit that generates an oscillation signal is provided. The oscillator circuit includes an oscillator that generates the oscillation signal based on positive feedback of a signal, a...
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7391275 |
Circuits and methods for a ring oscillator with adjustable delay and/or resonator tank stage
Circuits and methods for generating an oscillator output. The circuit generally includes a ring oscillator, with a series of inverters connected in series and an LC resonator tank (or a variable...
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7375598 |
System and method for increasing radio frequency (RF)/microwave inductor-capacitor (LC) oscillator frequency tuning range
System and method for increasing the frequency tuning range of a RF/microwave LC oscillator. A preferred embodiment comprises a voltage controlled oscillator (VCO) configured to generate an output...
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7375597 |
Low-noise fine-frequency tuning
Circuits, methods, apparatus, and code that provide low-noise and high-resolution electronic circuit tuning. An exemplary embodiment of the present invention adjusts a capacitance value by...
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7372343 |
Oscillator circuit
The invention is directed to an oscillator circuit in which a frequency-determining resonant circuit includes an inductive element, a first capacitive element and at least one second capacitive...
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7369009 |
Oscillator device for frequency modulation
The present invention pertains to an oscillator arrangement for carrying out a frequency modulation process, wherein an oscillator ( 1 ) with automatic amplitude control ( 5, 6, 7 ) is provided....
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7365614 |
Integrated clock generator and timing/frequency reference
In various embodiments, the invention provides a clock generator and/or a timing and frequency reference using an LC-oscillator topology, having a frequency controller to control and provide a...
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7365610 |
Push compensation in an oscillator
The effect of supply voltage variations on an oscillator circuit output are compensated for to reduce supply pushing. The change in a value of a first capacitance in a first direction in response...
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7362192 |
Low noise voltage-controlled oscillator
Oscillator circuits for reducing phase noise are described in this disclosure. In one embodiment, an oscillator circuit includes a pair of cross-coupled transistors, including a first transistor...
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7358826 |
Discrete clock generator and timing/frequency reference
In various embodiments, the invention provides a discrete clock generator and/or a timing and frequency reference using an LC-oscillator topology, having a frequency controller to control and...
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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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7345554 |
Integrable phase-locked loop including an acoustic resonator
A phase-locked loop that can be integrated into a semiconductor product comprises: a phase comparator having a first input, a second input and an output, said first input receiving a reference...
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7342464 |
Oscillator and a PLL circuit using the oscillator
The functionality and performance of a voltage-controlled oscillator are improved by enabling continuously adjusting an inductor by a control signal. The oscillator has a variable inductor unit...
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7342462 |
Quadrature LC voltage controlled oscillator with opposed bias and coupling control stages
A voltage controlled oscillator unit is provided with cross coupled voltage controlled oscillators to generate quadrature phases. One control stage adjusts coupling between the oscillators. Another...
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7336138 |
Embedded structure circuit for VCO and regulator
An oscillation circuit formed in a single semiconductor chip, wherein a first source voltage is supplied to a first power supply terminal, a second source voltage different from the first source...
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7327201 |
Semiconductor integrated circuit device and wireless communication device
A semiconductor integrated circuit device having a voltage controlled oscillation circuit that is capable of sufficient oscillation performance and a wireless communication device having the...
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7323763 |
Semiconductor device having an improved voltage controlled oscillator
A semiconductor device having an improved voltage control oscillator circuit is provided. The voltage control oscillator circuit includes, in combination, a variable-capacitance element and at...
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7319366 |
Offset local oscillator without using frequency divider
A local oscillator without a frequency divider is provided. The local oscillator includes a quadrature voltage controlled oscillator generating I and Q signals having a frequency which is one-third...
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7317363 |
Frequency synthesizer
There is provided a phase locked loop circuit which receives a reference signal having a reference frequency and a first signal having a first frequency, compares phases of the reference signal and...
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7312670 |
Voltage controlled oscillator
The voltage controlled oscillator comprises an oscillating system wherein two variable capacitors are alternately connected. The capacitances of these two capacitors vary respectively in the same...
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7307486 |
Low-latency start-up for a monolithic clock generator and timing/frequency reference
An apparatus, system and method are provided for low-latency start-up of a free-running harmonic oscillator. The exemplary apparatus embodiment comprises a first and second current sources to...
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7304548 |
Differential voltage controlled oscillator using complementary transistors cross-coupled in series, and transceiver using the same
A differential voltage controlled oscillator comprises first and second transistors having opposite magnitudes and directions of currents flowing to a third electrode from a second electrode...
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7301411 |
Voltage-controlled oscillator circuit with analogue and digital actuation
A VCO circuit ( 20 ) has a coil ( 21 ) and, in parallel therewith, a constant capacitance ( 24 ) and adjustable capacitance elements ( 22, 23 ). A first capacitance element ( 22 ) is formed by one...
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7298225 |
Signal modulated voltage controlled oscillator system
Improved voltage controlled oscillator (VCO) circuits are disclosed. A symmetrical voltage controlled oscillator (VCO) system according to the embodiments of the present invention comprises a...
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7292108 |
Voltage controlled oscillator for frequency synthesizer
The voltage controlled oscillator includes an oscillating transistor, and first and second inductance elements which are connected in series and provided between an output terminal of the...
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7289003 |
Method and apparatus for amplitude control using dynamic biasing in a voltage controlled oscillator
A method, circuit, and/or system for controlling an amplitude and/or limiting or reducing the energy consumed by an LC voltage controlled oscillator (LCVCO). In one embodiment, an oscillator can...
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7289002 |
Complementary metal oxide semiconductor voltage controlled oscillator
A complementary metal oxide semiconductor voltage controlled oscillator is provided. The voltage controlled oscillator includes an LC tank which is supplied with a power supply voltage, the LC tank...
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7279994 |
Variable capacitance circuit having on/off switch for variable capacitance function, and voltage controlled oscillator using the variable capacitance circuit
A variable capacitance circuit capable of switching on and off a variable capacitance function, includes variable capacitance means formed such that variable capacitance elements whose capacitance...
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7276979 |
Oscillation device and mobile communication apparatus
A differential type voltage control oscillator is formed of a differential tank circuit, an oscillation transistor, and a differential variable capacitance circuit. The differential variable...
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7274264 |
Low-power-dissipation CMOS oscillator circuits with capacitively coupled frequency control
Methods and apparatus are disclosed for adjusting the frequency tuning range of an oscillator circuit. The oscillator circuit is comprised of at least two MOS devices; a first reactance connecting...
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7271673 |
Voltage controlled oscillator (VCO) tuning
In accordance with certain described implementations, a voltage controlled oscillator (VCO) includes a VCO coarse tuning bank having multiple coarse tuning bank bits. Each coarse tuning bank bit...
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7271672 |
Voltage controlled LC tank oscillator
Voltage controlled oscillator comprising a LC tank circuit (L, C, R) coupled to modulator means and characterized in that the modulator means are coupled to amplifier means via an adder for...
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7259638 |
Voltage controlled oscillator and semiconductor integrated circuit for communication
A VCO include a resonance tank circuit(A) and an amplification circuit(B) which oscillates and is amplified at a resonance frequency of the resonance tank circuit(A). The resonance tank circuit(A)...
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7256660 |
CMOS LC-tank oscillator
A CMOS LC-tank oscillator includes a pair of symmetric inductors and a differential pair of transistors. The inductors have a first one of their terminals interconnected at a supply node to which a...
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7253693 |
Method and apparatus for noise compensation in an oscillator circuit
A variable capacitance circuit includes a first and a second capacitor. A switch having an associated first nonlinear capacitance, selectively couples the first and second capacitors. To compensate...
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7250826 |
Mutual inductance in transformer based tank circuitry
Placing inductors or resistors in parallel causes the combined value of inductance or resistance to decrease according to the parallel combination rule. This invention decreases the parasitic...
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7239209 |
Serially RC coupled quadrature oscillator
The oscillator includes: a first oscillator circuit in which first and second transistors cross-connected to each other are connected to a resonant circuit; and a second oscillator circuit in which...
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7230504 |
Controlled oscillator
A controlled oscillator circuit includes an amplifier including a first transistor coupled between a first node and a reference node, and a second transistor coupled between a second node and the...
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7227423 |
Monolithic clock generator and timing/frequency reference
In various embodiments, the invention provides a clock generator and/or a timing and frequency reference, with multiple operating modes, such power conservation, clock, reference, and pulsed modes....
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7221234 |
VCO with switchable varactor for low KVCO variation
A method and system for VCO with switchable varactor for low KVCO variation is provided. Aspects of a method for controlling a signal may comprise controlling an oscillating frequency of a time...
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7218182 |
Voltage controlled oscillator
An LC circuit section and a negative resistance section are provided for an LC-VCO. A pair of output terminals are provided for the LC circuit section and an inductor is connected between the...
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7209014 |
Switching device actuated by a transponder
Proposed is a device actuated by a transponder for the generation of a switch signal. The device is based on an oscillating circuit ( 10 ) with a capacitance (C 1 ), an identification coil (L 1 )...
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7199698 |
Digitally-controlled reference oscillators
Varactor and reference oscillator structures are provided that are particularly suited for integrated circuit fabrication and which provide excellent parameter performance (e.g., monotonicity,...
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7199675 |
Source-injection parallel coupled LC-quadrature voltage controlled oscillator
A quadrature VCO comprises: a first delay cell including a first differential VCO coupled between a power supply and a first current source; and first and second coupling transistors that each...
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7196592 |
VCO circuit with broad tuning range and amplitude control
A voltage-controlled oscillator circuit. A pair of inductors are coupled to a first power source. A pair of capacitors respectively coupled between a variable resistor and the pair of inductors in...
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7193485 |
Method and apparatus for bi-planar backward wave oscillator
The disclosure relates to a sub-millimeter backward wave oscillator. More specifically, the disclosure relates to a miniature backward wave oscillator having a biplanar interdigital circuit. In one...
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7193484 |
Voltage controlled oscillator apparatus
A voltage controlled oscillator apparatus includes at least two voltage controlled oscillators, each of the voltage controlled oscillators being formed on a semiconductor substrate and having an...
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7190236 |
Apparatus and method of oscillating wideband frequency
An apparatus and method of oscillating a wideband frequency are disclosed. The apparatus includes: a frequency oscillating unit for oscillating a predetermined frequency; a phase-locked loop for...
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7190232 |
Self-biased active VCO level shifter
A voltage-controlled oscillator (VCO) circuit includes first, second, third, and fourth transistors, each with a first terminal, a second terminal, and a control terminal. The first terminal of the...
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7183870 |
Resonant circuit and a voltage-controlled oscillator
A voltage-controlled oscillator comprising a resonant circuit and MOS transistors which constitute a negative resistance circuit of a differential structure. The resonant circuit consists of an...
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