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WO/1999/048209A2 |
An oscillator (1) is stabilized by a frequency discriminator in order to reduce its phase noise. A microwave amplifier (4) supplies sufficient power to maintain the oscillation. The oscillator and the frequency discriminator use a common...
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WO/1999/038260A1 |
The invention concerns an oscillator (20) designed to supply a periodic voltage (Vo) at a predetermined frequency (f). Said oscillator comprises; a reference source (23) capable of supplying a reference voltage (Vref), said reference sou...
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WO/1999/037018A1 |
A piezo-oscillator reduced in current consumption and size, comprising a crystal oscillator as a piezoelectric vibrator, an oscillation circuit, a plurality of surface mounted heaters, and a temperature control circuit for controlling th...
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WO/1999/023753A1 |
A highly stable single chip crystal controlled oscillator with automatic gain control (AGC). An amplitude detector (15) monitors the output of a crystal controlled oscillator amplifier (12) and produces a feedback signal proportional to ...
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WO1999003194A9 |
The present invention relates to a quartz generator that comprises an outer housing (1), a plate (2) as well as an inner housing (6) at the bottom of which the resonator is placed in its own housing (9). The inner housing (6) is made in ...
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WO/1999/016172A2 |
The invention relates to a method for temperature compensation in an electric circuit. In order to get rid of costly manufacturing processes and external components, a PTAT resistor is replaced by a series connection of two resistive ele...
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WO/1999/003195A1 |
A crystal oscillation device with a temperature compensation function comprising: a constant voltage circuit (12) for outputting a predetermined voltage that does not depend on the ambient temperature; a temperature sensor circuit (13) f...
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WO/1999/000902A1 |
A communication device including a plurality of frequency synthesizers (24, 28, 30). At least one of the frequency synthesizers (24) is driven with a reference frequency from a crystal oscillator (58). The at least one frequency synthesi...
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WO/1998/056105A1 |
An approximate third-order function generator that controls variables of different orders independently to generate only the third-order component, and a temperature compensation quartz oscillation circuit made by using the generator, wh...
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WO/1998/056112A2 |
A frequency-drift ($g(D)F) of an oscillator (OSC) is compensated ($m(K)-$g(D)F) by varying various different biasing parameters (V, I) in the oscillator. The biasing parameters (V, I) which are varied may include, for example, voltages (...
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WO/1998/045950A1 |
The present invention relates to an afc-digitial tuning circuit having an oscillator (1), a digital synthesis system (DDS) (2) to which the frequency f�xtal? of the oscillator (2) is directed as a clock rate and which generates an outp...
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WO/1998/037635A1 |
Micromachined, thermally insensitive silicon resonators are provided having accuracy equivalent or superior to that of quartz resonators, and are fabricated from a micromechanical, silicon-on-glass process. In one embodiment, such a reso...
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WO/1998/034349A1 |
Apparatus (52), and associated method (108), for determining frequency deviation (fda) of an oscillator (54) due to aging of the oscillator (54). Frequency deviation of a clock signal generated by the oscillator (54) relative to a refere...
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WO/1998/034123A1 |
A method and system are provided for calibrating a batch of devices each containing a circuit, which is responsive to a control signal for producing a desired output which varies in accordance with a first predetermined function of a spe...
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WO/1998/031104A1 |
An inexpensive small-sized PLL (phase-locked loop) oscillator for use as the clock source of a computer, etc., which can output such a high frequency about 40 MHz that is difficult to obtain from a fundamental-based crystal oscillator. T...
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WO/1998/027652A1 |
A temperature compensation (TC) circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide TC digital data (30) for a cry...
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WO/1998/027651A1 |
A temperature compensation circuit (10) for a crystal oscillator module (12) used in a communication device (200). An existing microcontroller (210) of the communication device (200) is used to provide temperature compensating digital da...
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WO/1998/015053A1 |
An oscillator that has a substantially-constant voltage source (101) configured such that it does not require the voltage source to be tuned to a particular voltage to oscillate a particular frequency. The oscillator has greater precisio...
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WO/1997/040580A1 |
A frequency synthesizer (200) with temperature compensation and frequency multiplication. The synthesizer (200) having a temperature uncompensated frequency oscillator (202) coupled to a phase locked loop (206) including at least one tem...
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WO/1997/014183A1 |
A function-differentiated temperature compensated crystal oscillator (10) is disclosed having an integrated circuit, at least one capacitor and a piezoelectric element being electrically coupled to a leadframe, and being encapsulated in ...
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WO/1997/002657A1 |
There is described a stabilization process for the local oscillator frequency in wide-band tunable DROs employed in receivers of a digital microwave radio link. A microprocessor, already provided for normal operation control, cyclically ...
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WO/1997/001887A1 |
A method for automatically compensating for accuracy degradation of the reference oscillator (170) is provided for a communication device (100). The communication device (100) is programmed with a first frequency value to detect a target...
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WO/1996/037959A1 |
The invention concerns a telecommunication apparatus having a crystal unit as a standard frequency generator. A compensation mode input into the apparatus-specific microprocessor before the operating programme runs counteracts the temper...
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WO/1996/032775A1 |
A quartz oscillator device having a small-sized semiconductor integrated circuit comprising a memory and a control circuit, and consuming a low power. The quartz oscillator device is equipped with a quartz oscillator, a frequency adjusti...
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WO/1996/025796A1 |
Chip logic (38), a phase locked loop (PLL) clocking circuit (30), a temperature sensing circuit (32), and a power management circuit (34), are integrated on a very large scale integrated (VLSI) circuit chip. The temperature sensing circu...
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WO/1996/024986A1 |
A method and an apparatus for compensating for aging and temperature of the crystal in a crystal oscillator. An RF signal which is transmitted by a mobile telephone switching office (MTSO) (108) and received by the antenna (118). The sig...
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WO/1996/021950A1 |
A frequency stable oscillating device (120) includes an oscillating transistor (22). A heating element is disposed in close proximity to the oscillating transistor (22). A temperature sensor (30) is mounted in close proximity to the osci...
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WO/1996/020535A1 |
An apparatus for providing excitation of a vapor discharge lamp (12) includes a control circuit (20) for controlling an oscillator circuit (16) during an ignition mode of the vapor discharge lamp (12) to establish and maintain a substant...
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WO/1996/017433A1 |
A low power temperature compensated crystal oscillator (10) is disclosed. The temperature compensated crystal oscillator (10) has a crystal oscillator circuit (12), a voltage controlled reactance element (30), a temperature compensation ...
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WO/1996/003799A1 |
Quartz oscillation means is constituted of a parallel circuit of a quartz oscillator (1), an oscillation inverter (3) and a feedback resistor (5), and a fixed capacitance (15) for temperature compensation and a MOS resistance (17) for te...
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WO/1996/001524A1 |
A resin-molded piezoelectric oscillator integrally comprising an encased piezoelectric device such as a quartz oscillator or a SAW resonator and an IC chip such as a PLL IC electrically connected to the oscillator. A lead for heat radiat...
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WO/1995/034133A1 |
The invention relates to a phase-locked loop and a method for controlling a phase-locked loop which comprises a phase comparator (12), a charge pump (13), a loop filter (14) and a voltage-controlled oscillator (15), in which method the l...
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WO/1995/027329A1 |
A tuning circuit for a reference oscillator (200) including voltage variable capacitors (222, 224) in a back to back configuration and providing a control terminal for voltage controlled tuning of the reference oscillator (200). Also inc...
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WO/1995/022855A2 |
Apparatus and methods for improving timing recovery of a system clock by causing its frequency to be within a specified tolerance range during a timing recovery acquisition period for the system clock. The apparatus includes a voltage co...
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WO/1995/015031A1 |
A modified temperature compensation signal (110) is provided in a temperature compensated crystal oscillator (TCXO) circuit (100) in the following manner. A temperature dependent current generator (104) produces a temperature compensatio...
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WO/1994/027372A1 |
The invention relates to a method for starting a radio transmitter. In the method a transmission frequency is generated by a phase/frequency-locked loop which comprises a phase/frequency comparator (101), a loop filter (102) and a voltag...
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WO/1994/018753A1 |
A voltage controlled oscillator (VCO) provides an output signal with an output frequency that varies only minimally for any given input control voltage despite variations in the manufacturing process, temperature and supply voltage. The ...
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WO/1994/011763A1 |
To provide stable, accurate time reference signals for control and operation of a well logging instrument (12), a temperature isolation enclosure (14) defines an internal cavity (16) for containing and protecting an electronic time base ...
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WO/1994/003980A1 |
Dual mode oscillator (9), e.g. to be used in a temperature compensated circuit in which during operation at least a first oscillation having a fundamental frequency and a second oscillation having a second frequency occurs, which second ...
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WO/1993/020619A1 |
The invention relates to an oscillator unit for a base station or the like in a digital cellular radio network. The oscillator unit comprises an adjustable oven stabilized crystal oscillator (21). The oscillator unit additionally compris...
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WO/1993/015555A1 |
Certain operational characteristics of a crystal (104) are measured during a testing and grading process. Once determined, information representing these operational characteristics are stored in memory (120) and utilized by a controller...
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WO/1993/005578A1 |
A frequency synthesizer comprising a phase-locked loop, wherein the phase of a comparison signal based on the output of a voltage controlled oscillator (7) is compared with the phase of a reference signal based on the output of a referen...
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WO/1992/012576A1 |
The invention relates to an oscillator unit with improved frequency stability, comprising at least three oscillators (1, 2, 3) having the same nominal frequency; and means (14, 15) for selecting one of the oscillators (1, 2, 3) for conne...
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WO/1992/006538A1 |
The invention relates to a piezoelectric oscillator with frequency regulation in a range of temperatures. It is comprised of: an oscillating circuit including an amplifier (A1) whose output is fed back to the input through a variable cap...
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WO/1991/001590A1 |
A circuit (10) for temperature compensation of a varactor voltage controlled oscillator control signal (Vtune) includes a proportional to absolute temperature (PTAT) current source (32) and an adjustable, temperature stable current sourc...
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WO/1990/016113A1 |
The present invention relates to control of a frequency source (1) in, for example, a remote unit in a mobile communications system, in order to maintain a stable frequency signal. In normal operation the frequency source (1) is frequenc...
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WO/1990/015484A1 |
An automatic voltage-controlled oscillator (VCO) current control circuit (100, 200, 300 or 400) that senses a voltage in the VCO (201) representative of the current of the VCO (201), compares that voltage (V2) to a reference voltage (V1)...
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WO/1990/015483A1 |
A voltage-controlled oscillator includes a compensating signal value calculator which calculates the value of a function representing the portion of the oscillator temperature-frequency transfer curve corresponding to the ambient tempera...
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WO/1990/008429A1 |
Transistorized oscillator stabilized against variations in temperature for oscillating circuits. In order to stabilize the oscillating circuit voltage against variations in temperature, a transistor (T2) thermally coupled to the coil (L)...
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WO/1990/002444A1 |
An oscillator (10) including a first frequency control network (12) having a series coupled inductance (L1) and sensor capacitor (CS1), a pair of cascaded capacitors (C1 and C2), and an emitter follower amplifier (18) coupled thereto. Th...
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