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Class Information
Number: 332/135
Name: Modulators > Frequency modulator > Including discrete semiconductor device
Description: Subject matter containing an electrical device whose constituent portions are constructed from solid material having room temperature conductivity between that of a conductor and an insulator and which conductivity is typically modified through the addition of small amounts of dopant.
Sub-classes under this class:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7388446 |
Directly modulated CMOS VCO |
Jun. 17, 2008 |
| 6545557 |
FM signal oscillator circuit and modulation level control method |
Apr. 8, 2003 |
| 5982446 |
Video modulator arrangement |
Nov. 9, 1999 |
| 5926072 |
FM modulator using a monostable multivibrator |
Jul. 20, 1999 |
| 5767752 |
Frequency modulator with center frequency and modulation controlled by an input signal |
Jun. 16, 1998 |
| 5731745 |
High frequency oscillator circuits operable as frequency modulators and demodulators |
Mar. 24, 1998 |
| 5717364 |
Mixer |
Feb. 10, 1998 |
| 5654677 |
Relaxation oscillator of reduced complexity using CMOS equivalent of a four-layer diode |
Aug. 5, 1997 |
| 5585751 |
Frequency control circuit of FM modulator |
Dec. 17, 1996 |
| 5515014 |
Interface between SAW filter and Gilbert cell mixer |
May. 7, 1996 |
| 5506547 |
Frequency modulator having LC oscillator with switchable frequencies |
Apr. 9, 1996 |
| 5502420 |
Cascode VCO frequency modulator |
Mar. 26, 1996 |
| 5498885 |
Modulation circuit |
Mar. 12, 1996 |
| 5428226 |
Relativistic semiconductor plasma wave frequency up-converter with energized portion |
Jun. 27, 1995 |
| 5323024 |
Relativistic semiconductor plasma wave frequency up-converter |
Jun. 21, 1994 |
| 5198784 |
Frequency modulated oscillator having controllable current sources |
Mar. 30, 1993 |
| 5168248 |
Ferri-magnetic film frequency modulator |
Dec. 1, 1992 |
| 5155455 |
AM/FM modulator in which AM can be converted to FM by vector addition |
Oct. 13, 1992 |
| 5130674 |
Voltage controlled oscilator having controlled bias voltage, AGC and output amplifier |
Jul. 14, 1992 |
| 5087897 |
Oscillator tunable by varying current in spiral inductor on ferrite substrate |
Feb. 11, 1992 |
| 5075643 |
Frequency modulator |
Dec. 24, 1991 |
| 5045818 |
PLL frequency modulator having bias voltage applied to filter capacitor |
Sep. 3, 1991 |
| 4988960 |
FM demodulation device and FM modulation device employing a CMOS signal delay device |
Jan. 29, 1991 |
| 4959625 |
Wide bond balanced output frequency modulator using a video signal as a modulation signal |
Sep. 25, 1990 |
| 4675618 |
Linearizer circuit for frequency modulation oscillator |
Jun. 23, 1987 |
| 4635296 |
Wide bandwidth ultra high stability FM telemetry transmitter |
Jan. 6, 1987 |
| 4631502 |
Transistor modulator for converting video game signals into antenna input signals for a television receiver |
Dec. 23, 1986 |
| 4602224 |
Variable capacitance reactance circuit |
Jul. 22, 1986 |
| 4584542 |
Frequency modulator having parallel-connected phase adder and oscillator amplification elements |
Apr. 22, 1986 |
| 4571557 |
Wide band transistor oscillator |
Feb. 18, 1986 |
| 4565978 |
Integrable oscillator circuit |
Jan. 21, 1986 |
| 4533882 |
Frequency modulator wherein modulation takes place in a feedback loop of an oscillator |
Aug. 6, 1985 |
| 4481546 |
Modulator-demodulator for obtaining and demodulating frequency-modulated signal |
Nov. 6, 1984 |
| 4475244 |
Time-period modulation transmission system |
Oct. 2, 1984 |
| 4303894 |
FM Modulator using variable transistor capacitance |
Dec. 1, 1981 |
| 4091342 |
Time delay modulator |
May. 23, 1978 |
| 4059814 |
Controllable semiconductor element |
Nov. 22, 1977 |
| 4052673 |
Combined controlled oscillator and frequency multiplier |
Oct. 4, 1977 |
| 4021737 |
System for processing and transmitting audio signals received from a television set for reproduction by a high fidelity FM receiver |
May. 3, 1977 |
| 4009455 |
Phase locked loop angle modulation system with large modulation index |
Feb. 22, 1977 |
| 3986145 |
Variable reactance circuit including differentially-connected transistor device providing a variable reactance input impedance |
Oct. 12, 1976 |
| 3961285 |
Voltage controlled oscillator driver |
Jun. 1, 1976 |
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