Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 7257384 | Methods and apparatus for detecting the envelope of RF power signals Apparatus for detecting the envelope of an RF signal that comprises an RF transistor operating essentially at a non-linear operating point at the RF frequency range; a DC power supply for feeding the RF transistor; a dummy load for terminating the output of the RF t... | 08/14/2007 |
| 7098719 | Multiplexer with clock suppression At least two inputs, at least one output and a clock source for the inputs are provided in a multiplexer. Each input balances an input signal and is coupled to a transistor circuit having two transistors with collectors commonly connected to a power potential. The t... | 08/29/2006 |
| 7092682 | Electronic circuit, modulation method, information processing device, and information processing method A shaped-wave application section inputs a first pulse signal corresponding to transmission data output from a transmission data output section, and applies, to a modulation and amplification section, a signal wave corresponding to a second pulse signal such that th... | 08/15/2006 |
| 6930627 | Radio-frequency digital/analog converter system and method A radio frequency (RF) converter system and associated method are provided for generating and/or receiving RF signals. Included is a signal conversion circuit for digital signal processing (DSP) or converting between digital signals and analog signals. Further provi... | 08/16/2005 |
| 5973576 | Mixer for mixing carrier signals and data signals A low-powered mixer that is operable at a low voltage by a single positive power supply. A predetermined voltage and a first data signal Ss1 superimposed on the predetermined voltage are input into the drain D of an FET Q1, while a first carrier signal Sc... | 10/26/1999 |
| 5686870 | Mixer A low-powered mixer that is operable at a low voltage by a single positive power supply. A predetermined voltage and a first data signal Ss1 superimposed on the predetermined voltage are input into the drain D of an FET Q1, while a first carrier signal Sc... | 11/11/1997 |
| 5434546 | Circuit for simultaneous amplitude modulation of a number of signals A method for simultaneously imposing a single modulating signal on a number of constant frequency carriers includes applying the single modulating signal and all of the carriers to a doubly-balanced mixer circuit that produces sideband signals that are un... | 07/18/1995 |
| 5214397 | Modulator using low-pass filter as delay element A push-pull modulator stage 70 has two possible transmission paths, an electrically short path (7) and a phase delay path (6) with a phase delay element providing a phase shift of approximately 180°. The phase delay element has the form of a low pass fil... | 05/25/1993 |
| 5200715 | Waveform modulation and demodulation methods and apparatus A new method of modulating and demodulating signals and circuitry therefor is disclosed. The modulation circuit defines a non-linear voltage current transfer function wherein at low voltage levels the current voltage transfer function is substantially lin... | 04/06/1993 |
| 5172079 | Balanced modulator designed for low supply voltage A balanced modulation circuit includes first, second, and third differential amplifiers. The first differential amplifier includes first and second transistors (Q11, Q12) having the emitters connected to first and second constant-current sources (CS11, CS... | 12/15/1992 |
| 5153536 | Suppressed carrier modulator formed from two partial modulators each including a phase delay path A modulator suitable for 16 quadrature amplitude modulation (QAM) is designed as a double modulator (1), wherein a 16 QAM modulator (39) consists of two double modulators (1). One double modulator (1) has two partial modulators (1',1") forming a bridge. E... | 10/06/1992 |
| 4633195 | Balanced oscillator with constant emitter voltage level A balanced LC oscillator for providing differential oscillator output signals includes a pair of transistors the emitters of which are connected to a voltage reference source that provides a fixed voltage thereto. The base electrodes of each transistor is... | 12/30/1986 |
| 4547817 | High frequency magnetic recording method A method for recording high frequency signals representing data with simultaneous readout of low frequency information, such as servo information prerecorded on a magnetic disk, comprises the step of modulating with the data a carrier signal having a repe... | 10/15/1985 |
| 4413239 | Field effect transistor circuit for modulator and demodulator applications A double balanced modulator-demodulator consisting of two pairs of field ect transistors. A field effect transistor is connected in series between the source electrodes of each of the field effect transistor pairs. The field effect transistors making up ... | 11/01/1983 |
| 4278954 | Suppressed carrier modulator using differential amplifier The modulation system comprises emitter coupled first to fourth transistor pairs of one type, emitter coupled fifth and sixth transistor pairs of the other type, and a differential amplifier. The first and second transistor pairs are connected to the fift... | 07/14/1981 |
| 4180785 | Modulator for forming the product of two input signals A modulator suitable for amplitude modulation includes first and second converters for converting the positive and negative excursions of first and second input signals into four respective signals of one polarity which are passed through a multiplying de... | 12/25/1979 |
| 4142162 | Low-distortion double sideband suppressed carrier monolithic modulator A double sideband suppressed carrier (DSBSC) modulator for operation from unbalanced carrier frequency and modulation frequency sources has the input terminals of first and second constant current amplifiers connected to receive the modulation frequency o... | 02/27/1979 |
| 3986146 | Double balanced modulator-demodulator A double balanced modulator-demodulator which includes an input transformer with a secondary winding including two sections and an output transformer including a primary section connected in parallel with said secondary winding and an output winding coupl... | 10/12/1976 |
| 3940716 | Double-balanced modulating and demodulating apparatus A double-balanced modulating and demodulating circuit is disclosed for producing from carrier and modulating input signals at least one double sideband suppressed carrier signal. A pair of dual-channel amplitude modulators are provided each of which is op... | 02/24/1976 |
