Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7609123 | Direct modulation type voltage-controlled oscillator using MOS varicap Transistors M11 and M12 are cross-coupled to each other so as to form a negative resistance circuit. First and second variable capacitor sections 10 and 20 are connected in parallel with an inductor circuit so as to form a parallel resona... | 10/27/2009 |
| 7388446 | Directly modulated CMOS VCO A variable capacitor modulator for use in a voltage controlled oscillator, includes a differential varactor block, coupling capacitors for connecting nodes of the varactor block to a tank circuit, and an element connected between the respective nodes and ground to t... | 06/17/2008 |
| 7289004 | Dual port modulator The present invention relates generally to the field of frequency modulation, and in particular to dual port frequency modulators. The present invention provides a frequency modulator comprising a phase lock loop circuit (108) for receiving and modulating a c... | 10/30/2007 |
| 7283009 | Dual band voltage-controlled oscillator A resonance circuit is interposed between a base and a collector of an oscillating transistor and is configured such that a resonance frequency is switched in correspondence with two different frequency bands. A first feedback unit is interposed between the base and... | 10/16/2007 |
| 7155176 | System for synchronizing a portable transceiver to a network A system for synchronizing a portable transceiver to a network is disclosed. Embodiments of the system for synchronizing a portable transceiver to a network include a crystal oscillator, a frequency synthesizer adapted to receive an output of the crystal oscillator,... | 12/26/2006 |
| 6353370 | Method and apparatus for modulation of a voltage controlled oscillator A method and apparatus for modulation of a voltage-controlled oscillator (VCO). The VCO receives a tuning control voltage for adjusting a center frequency of an output periodic signal formed by the VCO. In addition, the VCO receives a modulation control v... | 03/05/2002 |
| 6046650 | Oscillator circuit having optimized frequency modulation circuit A voltage controlled oscillator circuit (58) having a modulation input port (60) for receiving a modulation input signal through modulation circuit (62, 64, 66, 68) and a frequency resonator circuit (28, 74, 76, 80, 82, 84) operable coupled to the modulat... | 04/04/2000 |
| 5905414 | VCO having control voltage and modulation signal applied to varactor A voltage controlled oscillator having a reduced oscillation frequency-modulation sensitivity variation and having a positive modulation function is designed to: (a) reduce the modulation variation by making the rate of change in oscillation frequency wit... | 05/18/1999 |
| 5900788 | Low-noise oscillator circuit having negative feedback A low-noise oscillator circuit with an amplifier element for negative feedback, specifically a transistor. In addition to a positive feedback of the oscillator transistor, provision is made for a negative-feedback loop with a pass band of 0 (thus DC coupl... | 05/04/1999 |
| 5870005 | Frequency modulated oscillator for transmitting short range signals A broadcast transmitter for generating low power modulated signals, especially for a wireless speaker system. A signal source such as a source of composite audio signals including left and right audio signals and a pilot signal are applied to a radio freq... | 02/09/1999 |
| 5801592 | Amplitude stabilized oscillator circuit An oscillator circuit is provided for stabilizing the amplitude of a HF oscillation of an audio signal. In such an oscillator circuit, an audio signal having a frequency in the range of 20 Hz . . . 20 kHz is coupled into the oscillator circuit, is modulat... | 09/01/1998 |
| 5731745 | High frequency oscillator circuits operable as frequency modulators and demodulators The high frequency circuit includes an oscillator connected in a Colpitts configuration. Negative feedback to the oscillator is applied through an amplifier, both to stabilize the circuit and to permit frequency modulation of the carrier signal generated ... | 03/24/1998 |
| 5606737 | Oscillator mixer and a multiplier mixer for outputting a baseband signal based upon an input and output signal In a structure adopted for an FM-CW radar, a corner waveguide for connecting each of transmission and reception antennas to a sensor unit is integrated with a sensor unit case. In a waveguide/strip line converter for converting the transmission mode betwe... | 02/25/1997 |
| 5589804 | Oscillator with impedance buffer for increased pullability A pullable overtone crystal oscillator (201) includes an impedance buffer (217) for buffering an input impedance (109) to an amplifier stage (203). This structure enables construction of an overtone oscillator with increased pullability because a drive le... | 12/31/1996 |
| 5502420 | Cascode VCO frequency modulator A voltage controlled oscillator apparatus for generating a desired frequency, set by a tuning voltage, toward modulating a transmission signal on the desired frequency. The voltage controlled oscillator apparatus includes an oscillator transistor the base... | 03/26/1996 |
| 5495208 | Wide band tunable and modulatable reference oscillator 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 included in the tunin... | 02/27/1996 |
| 5428404 | Apparatus for method for selectively demodulating and remodulating alternate channels of a television broadcast An apparatus and method for demodulating and remodulating a transmitted signal prior to presentation to a television receiver, the transmitted signal comprising a video signal, a first channel signal, and a second channel signal, wherein one of the two ch... | 06/27/1995 |
| 5357222 | Voltage controlled component including a capacitive diode biased to operate in the linear region The invention relates to a biased electronic circuit in which a voltage-controlled component has a characteristic with a non-linear portion and a substantially linear portion. The circuit is biased by a voltage being applied to one terminal of the compone... | 10/18/1994 |
| 5302918 | Subharmonic optically injection locked oscillator A fundamental or subharmonic optically injection locked oscillator is coupled to a phase locked loop circuit. The injection locked oscillator has two single stage HEMT amplifiers with parallel feedback from the drain of a second transistor to a gate of a ... | 04/12/1994 |
| 5254958 | Phase-lock-loop circuit and method for compensating, data bias in the same Biomedical information is directly digitally telemetered from the patient through a frequency modulated transmitter to a remote receiver and computer station. A phase-lock-loop circuit in the digital transmitter compensates for DC data bias by averaging a... | 10/19/1993 |
| 5187451 | Oscillator using microstrip line having minimized line width and length For minimization of a microstrip line and improvement of a Q value, the line length and width of the microstrip line are minimized, and the high frequency trend of the resulting resonant frequency is lowered and corrected to the resonant frequency near th... | 02/16/1993 |
| 5151668 | FM modulator for compensating modulation characteristics on each channel A frequency-modulation modulator in a cellular wireless telephone for modulating frequency after uniformly and linearly compensating for frequency characteristics to be suitable for each engaged channel in a cellular wireless telephone. Since frequency mo... | 09/29/1992 |
| 5140287 | Diode circuit flicker-noise reduction A diode circuit in which the flicker noise generated by the diode is reduced comprises a diode (D1) connected in series with a resistor (R2) having a by-pass capacitor (C1) in parallel therewith. In one embodiment the side of the diode remote from this re... | 08/18/1992 |
| 5126697 | Voltage controlled oscillator with a resonant network and a reactive network, having a control loop between the networks Voltage controlled oscillator provided with a resonant network, an amplifier and a reactive network, all incorporated in an oscillator loop, the reactive network having one or more reactive components whose values depend on a control signal fed to a contr... | 06/30/1992 |
| 5075644 | Voltage controlled oscillator with filtered and compensated modulation Briefly, according to the invention, a voltage controlled oscillator 200 having a control input, an information signal input, and an output is disclosed. The voltage controlled oscillator 200 comprises a tank circuit 202 for generating a carrier signal an... | 12/24/1991 |
| 5075643 | Frequency modulator An improved frequency modulation apparatus (100) is provided comprising a generator (102), a biasing voltage line (116), and an interface circuit (110). The generator (102) is utilized to generate a carrier signal. A control line input (104) on the genera... | 12/24/1991 |
| 5030928 | Zero crossing modulator A method and apparatus for modulating a radio frequency signal with digital data including: a variable oscillator, a modulator for varying the oscillator's output, a network for detecting when the oscillator's output crosses its zero axis, a storage devic... | 07/09/1991 |
| 4959625 | Wide bond balanced output frequency modulator using a video signal as a modulation signal A frequency modulator is provided, in which, for instance, a video signal is used as a modulation signal. A differential amplifier is formed by first and second transistors. First and second load resistors are connected between respective collectors of th... | 09/25/1990 |
| 4926144 | Multi-function modulation and center frequency control port for voltage controlled oscillator A circuit for use in conjunction with a voltage controlled oscillator (VCO). The circuit introduces modulation into a radio system (to create a substantially flat frequency response) at the same VCO port at which VCO frequency centering and negative bias ... | 05/15/1990 |
| 4801898 | Voltage-controlled oscillator A voltage-controlled oscillator includes a negative resistance generator, a resonant circuit, a first series circuit, a second series circuit, and a third series circuit. The first series circuit controls an oscillation frequency for changing a resonant f... | 01/31/1989 |
| 4748425 | VCO range shift and modulation device A modulation and range shift device for use with a PLL frequency synthesizer VCO. The modulation signal is provided to the negative side of the tuning varactor (16) of the VCO (14). In addition, variable voltages can be applied to the negative side of the... | 05/31/1988 |
| 4721927 | Voltage-controlled-oscillator with modulator A voltage-controlled-oscillator with a modulator, comprising a first variable capacitance diode and a second variable capacitance diode. The first variable capacitance diode is connected in series with the second variable capacitance diode to form a reson... | 01/26/1988 |
| 4721926 | Voltage-controlled-oscillator with modulator A voltage-controlled-oscillator with a modulator, comprising a first variable capacitance diode, a second variable capacitance diode, and a third variable capacitance diode. The second variable capacitance diode is connected in series with the third varia... | 01/26/1988 |
| 4684853 | Garage door opener using transmitter with SAW oscillator modulator A radio frequency (r-f) transmitter has an electric oscillator circuit for producing an oscillating r-f signal in an antenna. A feedback sub-circuit of the oscillator circuit includes a surface acoustic wave (SAW) resonator for stabilizing the oscillation... | 08/04/1987 |
| 4670888 | Frequency modulated modem transmitter A frequency modulated transmitter including a reference frequency source providing a reference frequency to a phase locked loop circuit. The phase locked loop circuit provides a frequency output signal stabilized in accordance with this reference frequenc... | 06/02/1987 |
| 4633197 | Single resonant tank modulated oscillator A modulatable oscillator for radio frequencies is disclosed in which the single resonant tank includes a tightly coupled varactor diode for wideband modulation and frequency control. Nonlinearities introduced by the varactor diode are compensated by predi... | 12/30/1986 |
| 4630008 | Direct FM crystal-controlled oscillator A direct frequency modulation crystal-controlled oscillator circuit is provided having a configuration which minimizes the number of parts required for modulation while maintaining a linear relationship between the incoming modulation voltage and the outp... | 12/16/1986 |
| 4620226 | Apparatus for producing audio and visual signals for modulating a television system carrier signal A television signal generator for producing a composite RF signal without high level intermodulation products. A signal network is provided to linearly combine a first video modulated carrier signal and a second carrier frequency of the same frequency mod... | 10/28/1986 |
| 4595888 | Pre-distortion shaping network A pre-distortion shaping network employing a field effect transistor as one leg of a resistive voltage divider for shaping the modulating signal of a voltage controlled oscillator is described.... | 06/17/1986 |
| 4538122 | Diode oscillator with independently variable frequency and power The oscillator includes a two-terminal device (1) as an active element and an impedance-matching network (4) for matching the two-terminal device to a load (A). The impedance-matching network is formed by a coupler (4) having four terminals (2, 3, 7, 8) t... | 08/27/1985 |
