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| Number | Title | Issue Date |
| 7158049 | Wireless communication circuit The invention includes a wireless communication circuit and a method of communicating with wireless signals that feature a tank circuit having an inductor connected in parallel with a capacitor circuit. The capacitor circuit includes a pair of capacitors coupled in ... | 01/02/2007 |
| 7065331 | Resonator configuration A resonator system and method are provided which includes/uses a tunable reference resonator, parts for tuning the reference resonator to a reference value via a controlled variable for the reference resonator, a tunable circuit resonator, and parts for tuning the c... | 06/20/2006 |
| 7065157 | GMSK modulation techniques This disclosure is directed to digitally implemented GMSK modulation techniques. The digital GMSK modulation techniques make use of a lookup table (LUT) and mapping logic to digitally generate GMSK waveforms. The mapping logic can significantly reduce the size of th... | 06/20/2006 |
| 6674334 | Oscillator having surface acoustic wave resonator and oscillation circuit An oscillator is provided that can be flexibly retrofitted to become usable for a wide range of applications, that is compatible with different users'requests, and that enables a user to design a high-frequency unit using the oscillator without concerns. ... | 01/06/2004 |
| 6653896 | Differential rf/microwave power amplifier using independent synchronized polar modulators A first amplified signal is produced at a first amplifier, a second amplified signal is produced at a second amplifier, and a differential signal representing difference between the first amplified signal and the second amplified signal is generated at a ... | 11/25/2003 |
| 6452461 | High-speed power-efficient coded M-ary FSK modulator A high-speed power-efficient coded M-ary Frequency-Shift Keying (M-ary FSK) modulator. The modulator includes a coding logic, which generates (M/2) Gray code signals in accordance with an (N-1) bits control signal; and (M/2) switching oscillators. Each sw... | 09/17/2002 |
| 6317009 | Frequency shift key modulating oscillator The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first... | 11/13/2001 |
| 6225873 | Frequency shift key modulating oscillator The present invention teaches a system for selectably oscillating at a first or a second oscillating frequency. The system comprises an oscillator for providing an oscillating output. Moreover, the system comprises a switching device for selecting a first... | 05/01/2001 |
| 6150894 | Oscillator having minimum frequency and amplitude fluctuation due to temperature variation An oscillator circuit, whose output signal has minimum fluctuation with changes in temperature, has an amplifier. Within the amplifier, a compensation resistor is connected to compensate for changes in amplitude and frequency of the output signal with tem... | 11/21/2000 |
| 6078226 | Integrated circuit implementation of a frequency shift keying oscillator A multiple frequency shifting oscillator that will provide a plurality of frequencies dependent upon a contents of an input shifting signal an input shifting signal is disclosed. The multiple frequency shifting oscillator has an amplifier with first input... | 06/20/2000 |
| 5949826 | Data transmission and reception system A data transmission and reception system according to this invention comprises a transmitter for transmitting data by modulating transmit data and a receiver for receiving and demodulating a signal from the receiver, wherein the receiver includes a parall... | 09/07/1999 |
| 5926072 | FM modulator using a monostable multivibrator A frequency modulation circuit includes an emitter-follower connection transistor (2), having a base supplied with a modulation signal, for generating an emitter voltage which is in proportion to a modulation signal level; and an integrated mono-stable mu... | 07/20/1999 |
| 5793261 | Saw stabilized FSK oscillator circuit A digitally-controlled SAW stabilized FSK oscillator circuit having an oscillator and a single-port SAW resonator with a predetermined circuit resonant frequency and being coupled to the oscillator for establishing a first oscillator output frequency, F | 08/11/1998 |
| 5532654 | FSK modulator using saw resonator with switchable capacitors An FSK modulator including an amplifier for oscillation has a surface acoustic wave resonator connected in series with a switching circuit formed without a variable-capacity diode but including a semiconductor switch and one or more fixed-capacity capacit... | 07/02/1996 |
| 5367537 | Saw-based FSK modulating circuit A frequency shift keying modulating circuit produces a first frequency according to a surface acoustic wave transducer natural resonant frequency and a second frequency according to the surface acoustic wave in combination with a reactive element. The fre... | 11/22/1994 |
| 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 |
| 5157358 | High speed frequency agile FSK modulator A modulation circuit that is particularly suited for a communication modem and provides for each of the channels precise carrier mark and space frequencies generated in response to external signals from an FSK communication station. The modulation circuit... | 10/20/1992 |
| 5136264 | Transmitter including an FSK modulator having a switched capacitor A transmitter including a continuous phase FSK modulator is disclosed for use primarily in optical transmission. The output frequencies are achieved by switching a capacitor into and out of an oscillator circuit by means of a PIN diode switch network whic... | 08/04/1992 |
| 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 |
| 5016260 | Modulator and transmitter A modulator includes a plurality of piezoelectric resonators, a plurality of oscillator circuits, arranged in a one-to-one correspondence with the plurality of piezoelectric resonators, for generating different frequency signals in correspondence with cor... | 05/14/1991 |
| 4990867 | Modulator In a modulator for converting two digital signals of I channel and Q channel in base band into analog signals and for converting a component of the signals whose phase is the same as a carrier and another component of the signals whose phase is orthogonal... | 02/05/1991 |
| 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 |
| 4682344 | Rf fsk transmitter An improved transmitter circuit for rf modems usable for communication in local area computer networks is provided. The transmitter circuit includes a digital/analog conversion circuit for generating a frequency modulated carrier from an input data signal... | 07/21/1987 |
| 4573025 | Drift-equalized, multi-frequency oscillator An oscillator having the ability to oscillate at a plurality of discrete frequencies in response to an applied digital signal is disclosed. A crystal-controlled, resonant circuit utilizing passive components as frequency determining elements and a PIN dio... | 02/25/1986 |
| 4555792 | Transmitter for transmitting an FSK-modulated signal A transmitter for transmitting FSK-modulated signals by way of an inductive aerial. A large frequency deviation, such as with FFSK-modulated signals, and a high transmission rate may cause the occurrence of a non-constant envelope. Electronic equipment ar... | 11/26/1985 |
| 4543541 | FSK modulation using switched outputs of two oscillators Two oscillators are utilized to convert digital data into an FSK modulated signal. One oscillator is at the mark frequency and the other is at the space frequency. FSK modulation is accomplished by switching between the two frequencies based on the state ... | 09/24/1985 |
| 4516086 | Frequency modulator for the transmission of analog data A modulator transmitting an analog data signal by variation of the frequency of an oscillator comprising an integrator (1, 2) and a bistable circuit with trigger hysteresis (8 to 13). The two-level voltage from the bistable circuit, taken to a terminal of... | 05/07/1985 |
| 4389622 | System for preventing transient induced errors in phase locked loop A system for minimizing synchronization errors in a phase-locked loop having a sequential phase detector for determining the phase difference between the output of the VCO of the phase-locked loop and a periodic control signal. Control circuitry is provid... | 06/21/1983 |
| 4063197 | Plural transistor oscillator phase continuous frequency encoder circuit A frequency modulation oscillator circuit is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous frequency modulated signal with no discontinuities. For each... | 12/13/1977 |
| 4063196 | Plural oscillator phase continuous frequency encoder A frequency modulation oscillator is provided having three or more output frequencies corresponding to three or more possible input signals, the output frequency being a phase continuous frequency modulated signal with no discontinuities. For each desired... | 12/13/1977 |
| 3991389 | Digital frequency shift key modulator A frequency shift key modulator producing sine wave output signals of different frequencies for mark (1) and space (0) signal levels on an input "send data" lead including a counter which divides the frequency of an input oscillator by different denominat... | 11/09/1976 |
