Matches 201 - 250 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >
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5455542 Symmetrical clock crystal oscillator circuit  
An oscillator circuit provides a symmetrical signal without halving the frequency of a crystal oscillator 12. The input 14 of the crystal oscillator 12 is low pass filtered, and the output 18 of...
5444422 Low phase noise high frequency integrated oscillator with minimum pins  
A low phase noise, high frequency low voltage integrated circuit oscillator has a minimum number of live pins. It includes a three transistor current mirror defining a voltage node and a current...
5428319 Method and apparatus for providing a modified temperature compensation signal in a TCXO circuit  
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...
5422605 Low-noise push-pull crystal oscillator  
A low phase noise oscillator 10 having a balanced feedback transformer 24 and a push-pull resonant circuit 12 for generating an oscillation excitation signal. The resonant circuit 12 is loaded by...
5416448 Oscillator circuit for use with high loss quartz resonator sensors  
The disclosure is directed to a Lever oscillator for use in high resistance resonator applications, especially for use with quartz resonator sensors. The oscillator is designed to operate over a...
5341112 Temperature stable oscillator circuit apparatus  
A stabilized oscillation circuit includes a bias circuit which controllably biases a bipolar-transistor-driven crystal oscillator circuit. The bipolar-transistor-driven crystal oscillator circuit...
5339051 Micro-machined resonator oscillator  
A micro-miniature resonator-oscillator is disclosed. Due to the miniaturization of the resonator-oscillator, oscillation frequencies of one MHz and higher are utilized. A thickness-mode quartz...
5332979 Compact radio-frequency power-generator system  
An RF power-generator system for the frequency range of 2 to 30 MHz and a programmable sinusoidal power output of 0 to 1000 W. The system is constructed of modules (10, 30, 50, 70 and 90)...
5309116 Multimode crystal oscillator  
A multimode oscillator is disclosed which employs a single gain loop for exciting at least two modes of a resonator to cause the oscillator to oscillate simultaneously at at least two frequencies....
5302921 Piezoelectric oscillator having reduced radiation of higher harmonics  
A piezoelectric oscillator in which radiation of higher harmonic components is reduced. A piezoelectric vibrator and a semiconductor device are provided in an oscillation circuit for making the...
5268657 High performance oscillator circuit with minimum frequency pulling at power on  
A high performance oscillator with low frequency pulling at turn on includes an oscillator transistor, a resonating element and a common base buffer transistor. The resonating element of the...
5263197 Dual port oscillator for two-stage direct conversion receiver  
A two-stage direct conversion receiver. A first mixer (13) converts the incoming signal to an intermediate frequency (IF) signal. A second mixer (16) converts the IF signal to a baseband signal. A...
5254961 Low-power crystal circuit  
A crystal oscillator circuit has a sleep mode of operation that reduces power consumption while maintaining oscillation to provide for a fast transition to a normal mode of operation.
5229735 Wide frequency deviation voltage controlled crystal oscillator having plural parallel crystals  
A wide frequency deviation voltage controlled crystal oscillator includes a multiple section bandpass filter containing a plurality of crystal or ceramic elements. One embodiment includes a...
5223801 Crystal oscillator and transmitter operating at the third harmonic of the fifth overtone of a crystal  
An improved short distance, battery powered, amplitude modulated RF transmitter for transmitting encoded security data. An oscillator stage provides a control crystal and filter which are feedback...
5220291 Complementary transistor oscillator  
An oscillator of the feedback amplifier type is described that employs a complementary bipolar transistors pair in which the collectors have a common connection with the output terminal. The...
5166645 Differential mixer oscillator  
A differential mixer oscillator employing two transistors in a differential pair as the sustaining amplifier for a quartz crystal resonator at some first high frequency. The bias current of the...
5155453 Low-power crystal oscillator  
An improved crystal oscillator and output circuit is disclosed. The oscillator has a normal operating mode and a low-power mode. In the low-power mode, a reduced current which is sufficient to...
5146189 Oscillator circuit with volatge controlled frequency  
An oscillator circuit with a voltage controlled oscillator (VCO) comprises a range changing circuit that adapts the d.c. control voltage of the circuit to a control signal suitable for adjusting...
5136263 Harmonic oscillator  
This invention relates to an oscillator for overtone operations which has reduced parts count and improved performance. More specifically, a new improved Pierce type of harmonic oscillator is...
5113153 High-frequency monolithic oscillator structure for third-overtone crystals  
A crystal oscillator circuit wherein first and second transistors are connected to form a differential pair. The second transistor functions as an inverting gain stage for the oscillator and two...
5081430 Overtone crystal oscillator having resonance amplifier in feedback path  
In an overtone crystal oscillator comprising a crystal oscillator having a feedback loop and a resonance amplifier whose amplitude characteristic has an overshoot in the range of the resonant...
5081431 Digital temperature-compensated oscillator  
A digital temperature-compensated oscillator comprises a crystal oscillator, a first memory previously storing digital temperature compensation data obtained by previously measuring the relation...
5075641 High frequency oscillator comprising cointegrated thin film resonator and active device  
A cointegrated high frequency oscillator including a thin film resonator and active devices formed on the same semiconductor substrate and by a process which is compatible with formation of both...
5063358 Ultra low noise crystal oscillator circuit  
An ultra low noise oscillator circuit including a crystal and having two outputs. At the two outputs, the signal is correlated and the noise outside of the crystal bandwidth is decorrelated....
5053723 Phase-locked loop with pulse-duration modulation fine frequency control  
A phase-locked loop includes an oscillator controlled by means of a switching network and a microprocessor which generates, in response to the output of a phase detector, two groups of output...
5030927 Reactance control circuit with a DC amplifier for minimizing a variation of a reference reactance value  
A reactance control circuit comprising a variable reactance circuit whose reactance is determined by the currents flowing to first and second differential transistor circuits, a differential...
5025231 Temperature-controlled crystal oscillator circuit  
A temperature controlled crystal oscillator circuit comprising an amplifier (12) having a feedback path including a crystal (26) and a frequency pulling element (28), and a temperature compensating...
5025229 Voltage-controlled oscillator using a surface elastic wave resonator  
A Colpitts oscillator has an integrated circuit. The integrated circuit includes a transistor having an equivalent large size, a bypass capacitor connected between a collector of the transistor and...
5010308 Crystal oscillator with offset and hysteresis  
An oscillator is provided with an internal, high gain hysteresis effect so as to offset the linear regions of the waveform and to avoid spikes upsetting the count of a reference divider controlling...
5004988 Quartz crystal oscillator with temperature-compensated frequency characteristics  
A temperature-compensated quartz crystal oscillator has two or more temperature compensating units. The first temperature compensating unit compensates the frequency-temperature characteristics of...
4996502 Ultrasonic atomizer circuit having plural oscillators  
An ultrasonic atomizer circuit having a plurality of unit oscillator circuits has been improved by preventing undesired interference between oscillator circuits. Each unit oscillator circuit has a...
4994764 Single-pin oscillator  
A single pin oscillator which consists of first and second transistors (17, 18) whose collectors are connected, via respective collector resistances (19, 20), to the positive pole of a DC source U...
4973922 Voltage controlled variable capacitor and oscillator using it  
A voltage variable capacitor (VVC) having two terminals in a variable frequency crystal oscillator integrated into a common substrate with the oscillator circuitry and isolated therefrom. The VVC...
4967166 Crystal oscillator and method for mounting the same  
A crystal oscillator including a crystal element designed to oscillate at a given frequency when subjected to an exciting voltage, and mounted parallel to and on a base through at least a wad made...
4959624 Coil-less overtone crystal oscillator  
A crystal oscillator circuit for use with overtone crystals restricts its resonant frequency to either fundamental or overtone frequencies. An inverting amplifier, which provides 180 degrees of...
4924195 Crystal oscillator with broad tuning capability  
A first transistor is connected in grounded-collector-emitter-follower configuration to generate a high enough negative resistance to overcome the oscillating resistance of the crystal resonator...
4918408 Oscillation circuit  
An oscillator including a CMOS inverter, a feedback reactance connected between the input and output terminals of the CMOS inverter and a CMOS transfer gate connected as a feedback resistor between...
4916413 Package for piezo-oscillator  
A piezo-oscillator includes a semiconductor element having at least an oscillating circuit. A piezo-vibrator having leads extending therefrom is connected to the semiconductor element by a...
4914406 Voltage controlled oscillator free from free-run oscillating frequency adjustment  
A voltage controlled oscillator free from free-run oscillating frequency adjustment is disclosed. This oscillator includes an amplifier having a positive feedback loop, a resonator connected to the...
4888566 Temperature compensated stable duty cycle crystal oscillator apparatus  
A temperature-compensated crystal oscillator utilizing a fundamental frequency crystal with an input RC network to bias an input transistor. Temperature compensation for the oscillator is achieved...
4888567 Voltage-controlled crystal oscillator with variable phase feedback  
A voltage-controlled oscillator in which a phase shifter is connected to a ceramic piezoelectric resonator. The phase shifter has a first circuit branch containing an amplifier. A second circuit...
4872765 Dual mode quartz thermometric sensing device  
A circuit is shown for representing the internal temperature of a crystal, through a combination of certain harmonic frequencies excited in that crystal. By forming a signal which is equal to nF A ...
4870383 Oscillator circuit  
An oscillator circuit comprising a feedback amplifier circuit having a power supply terminal, a resonant circuit comprising a crystal, and a differential amplifier which is coupled to a bias...
4864636 Crystal controlled transmitter  
A short distance, battery powered, amplitude modulated, crystal controlled RF transmitter for transmitting encoded security information. In its preferred embodiments, the transmitter comprises a...
4864256 Oscillator with reduced harmonics  
An oscillator for producing an oscillating signal with reduced harmonics includes an oscillator stage coupled to an output stage having a relatively fast switching speed yet producing an...
4862114 Crystal oscillators using negative voltage gain, single pole response amplifiers  
A simple and inexpensive crystal oscillator is provided which employs negative voltage gain, single pole response amplifiers. The amplifiers may include such configurations as gate inverters,...
4859969 Single transistor dual mode crystal oscillator(U)  
A single transistor dual mode crystal oscillator circuit is described which may excite more than one C-mode frquency in a crystal simultaneously such as the fundamental, used as a clock driver...
4851790 Crystal controlled oscillator exhibiting reduced levels of crystal-induced low frequency noise, vibration sensitivity and circuit temperature rise  
A crystal-controlled oscillator exhibiting reduced levels of crystal-induced low frequency noise, vibration sensitivity and circuit temperature rise includes an amplifier or oscillator sustaining...
4843349 UHF crystal oscillator  
A crystal-controlled oscillator operable at a direct UHF frequency includes an amplifier having a feedback circuit formed from an SC-cut crystal and an impedance network. The impedance network...
Matches 201 - 250 out of 744 < 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 >