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| Number | Title | Issue Date |
| 4520326 | Single-stage oscillator having low-impedance feedback port A single-crystal oscillator comprising a single transistor and a capacitor divider connected in a feedback path, which includes the crystal input and output ports, between the collector and base of the transistor, thereby to provide a low-impedance input ... | 05/28/1985 |
| 4511863 | Combined modulation and temperature compensation circuit A circuit arrangement for combining a temperature compensating signal from a temperature compensator with a modulation signal to provide a combined signal for driving one or more crystal oscillators independently. The combining is carried out in such a ma... | 04/16/1985 |
| 4510465 | Linear gain voltage controlled oscillator with modulation compensation In a compensated VCO circuit arrangement for providing constant modulation level over a wide frequency band a VCO is disclosed having a linear VCO gain factor vs. control voltage curve over the wide frequency band of interest. A compensation network is co... | 04/09/1985 |
| 4503402 | Voltage controlled oscillator having approximately constant modulation sensitivity A voltage controlled oscillator for use in a phase locked loop is provided with a first varactor circuit that responds to a control signal to set the center frequency of the oscillator, and with a second varactor circuit comprising a modulation varactor t... | 03/05/1985 |
| 4494090 | Frequency modulation system for a frequency synthesizer A voltage controlled oscillator includes a main varactor diode coupled to a frequency resonating circuit to produce an output frequency in response to a control voltage. A secondary varactor diode of an appreciably lower voltage to frequency sensitivity r... | 01/15/1985 |
| 4442415 | Multichannel frequency modulator A single Colpitts-type oscillator has a plurality (here, three) of optional inputs, each having a separate oscillating circuit individually associated therewith. By suitably applying a potential to a selected one of the oscillating circuits, the oscillato... | 04/10/1984 |
| 4378534 | Wideband modulation sensitivity compensated voltage controlled oscillator A wideband, modulation sensitivity compensated, voltage controlled oscillator which automatically and continuously compensates over a wide bandwidth for modulation sensitivity variations resulting from changes in the center frequency of oscillation. The i... | 03/29/1983 |
| 4375621 | Circuit for linearizing frequency modulated oscillators on microstrip In a microstrip frequency modulated oscillator, the linearity of the modulating circuit incorporating a varactor diode is adjusted by using a microstrip transmission line as a secondary resonator in conjuction with a variable reactor. The varactor is conn... | 03/01/1983 |
| 4360790 | Varactor controlled push-pull oscillator An oscillator arrangement is disclosed which is controllable in its frequency and which comprises a control input for frequency variation and a transformer output, whose frequency-determining oscillating circuit possesses, as a controllable reactive eleme... | 11/23/1982 |
| 4353038 | Wideband, synthesizer switched element voltage controlled oscillator An exceptionally wideband, synthesizer controlled voltage controlled oscillator is disclosed which is characterized by a plurality of pin diode frequency shift networks which, when actuated shifts the frequency of the oscillator in selectable binary steps... | 10/05/1982 |
| 4195268 | Crystal oscillator including adjustable auto transformer for neutralizing crystal capacitance In a high frequency oscillator circuit, or other high frequency circuit, utilizing a crystal, the physical capacitance Co, of the crystal may be neutralized and the impedance match of the crystal to the remaining circuit achieved over a range o... | 03/25/1980 |
| 4189690 | Resonant linear frequency modulator A circuit which modulates an r.f. carrier to produce an FM signal having a substantially linear frequency relation to an applied modulating voltage over a selected deviation bandwidth. An r.f. oscillator having an output matching circuit supplies the carr... | 02/19/1980 |
| 4134085 | Narrow deviation voltage controlled crystal oscillator for mobile radio A linear sensitivity voltage controlled crystal oscillator of the type including a resonator coupled to a negative resistance generator. The resonator comprises a crystal connected in series with a voltage variable capacitance device. The response of the ... | 01/09/1979 |
| 4091342 | Time delay modulator A time delay modulator is disclosed in which the instantaneous time base of a carrier signal is varied in accordance with a modulating signal. In one embodiment, modulation is achieved through the use of charge transfer delay lines and variable frequency ... | 05/23/1978 |
| 4088968 | Frequency linearization and sensitivity equalization of a frequency modulated crystal oscillator A direct FM modulator includes an oscillator comprising a current conducting device providing amplification to sustain oscillations and a frequency determining circuit connected thereto for controlling the frequency of oscillation. The frequency determini... | 05/09/1978 |
| 4074209 | Wide range frequency modulation of narrow loop bandwidth phase-locked oscillators Frequency-modulated phase-locked loop oscillator with a special modulator bypassing the phase-locked loop to inject modulation voltage directly into the voltage-controlled oscillator of the loop to broaden the bandwidth of modulation.... | 02/14/1978 |
| 4010428 | Transistor oscillator utilizing clapp circuit configuration for operation in the microwave band A transistor oscillator for the microwave band, utilizing CLAPP-circuit configuration, in which a small additional capacitance is connected in series with collector-base capacitance and is disposed between the base and ground. The additional capacitance m... | 03/01/1977 |
| 4003004 | Frequency modulated oscillator A frequency modulated push-pull oscillator in which the non-linear characteristic of varactors producing frequency modulation is compensated for by an opposite non-linear characteristic of a field effect transistor (FET) providing modulating bias to the v... | 01/11/1977 |
| 3995233 | Temperature compensated variable frequency crystal oscillator A temperature compensated variable oscillator formed of at least two capacitors and a resonator, or vibrator, made of lithium tantalate, in which an inductance element whose inductance value can be varied is connected in series to the vibrator; the capaci... | 11/30/1976 |
| 3958190 | Low harmonic crystal oscillator A colpitts oscillator having a tank circuit and a common base connected transistor, operating in a linear range, with an emitter-base junction coupled in the tank circuit and a load in the collector circuit thereof for passing current through the load at ... | 05/18/1976 |
