Did You Know...
...that several people are credited with the invention of the flush toilet? Most people have heard of Thomas Crapper (1837-1910), the sanitary engineer who invented the valve-and-siphon arrangement that made the modern toilet possible. Another claimant to "the throne" was British inventor Alexander Cumming who patented a toilet in 1775. Then there's a nameless Minoan (a native of ancient Crete) who lived 4,000 years ago who supposedly was ahead of his time and created the first flush toilet!
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| Number | Title | Issue Date |
| 7893758 | Quadrature modulator and calibration method A quadrature modulator and a method of calibrating same by applying a first test tone signal to an in-phase modulation branch input of the modulator and a ninety degree phase-shifted version of the first test tone signal to a quadrature modulation branch input of th... | 02/22/2011 |
| 7265937 | Positioning of a head array over a data storage medium A data storage system in which multiple readback signals are resolved is provided. The data storage system includes a data storage medium configured to store servo marks and data marks. The data storage medium has tracks that are divided into sectors. An array of he... | 09/04/2007 |
| 7054778 | Method and device for processing analogue output signals from capacitive sensors An analogue output signal of a sensor which comprises a carrier signal with a carrier frequency ωC which is modulated by a measurement size is sampled with a sampling frequency ωA to receive a sampled sensor output signal. The frequency ω | 05/30/2006 |
| 6809584 | Signal transmission and receiving methods optimized for integrated circuit implementation A demodulator for demodulating a modulated input signal transmitted at a carrier frequency includes a current mirror for receiving the modulated input signal and generating a first and a second current-mirror output signals of same amplitude and frequency as the mod... | 10/26/2004 |
| 6580902 | Frequency translation using optimized switch structures Methods, systems, and apparatuses for down-converting an electromagnetic (EM) signal by aliasing the EM signal are described herein. Briefly stated, such methods, systems, and apparatuses operate by receiving an EM signal and an aliasing signal having an ... | 06/17/2003 |
| 6483381 | Signal transmission and receiving methods optimized for integrated circuit implementation This invention discloses a demodulation method. The method includes steps of: A) Receiving a modulated input signal having an input signal frequency. B) Generating a first switch control signal at a first switching frequency substantially equal to the inp... | 11/19/2002 |
| 6366164 | Integrated circuit layout for LF - signal acquisition in the case of contactless data transmission Integrated circuit layout for LF signal acquisition in the case of contactless data transmission Known circuit layouts for LF signal acquisition only provide for a very short communication distance between transponder and base unit, and consist of several... | 04/02/2002 |
| 6285719 | Digital phase sensitive rectification of AC driven transducer signals A method and a system for phase sensitive rectification of signals from transducers driven by an AC excitation signal will be disclosed. The method and system demand a very moderate calculation capacity, thereby to facilitate the use of low cost microproc... | 09/04/2001 |
| 5724002 | Envelope detector including sample-and-hold circuit controlled by preceding carrier pulse peak(s) A sampling synchronous envelope detector adopts a specialized sample-and-hold ("S&H") approach, basing a detected output on instantaneous values of the carrier waveform which are sampled at specially chosen instants. Non-linear distortion is avoided by ti... | 03/03/1998 |
| 5550507 | Demodulator employing cyclic switching of the gain factor of an operational amplifier between different predetermined values An AM demodulator circuit arrangement includes an operational amplifier having at least two alternate input networks and at least two alternate feedback networks which can be selectively activated by switching signals so as to establish an amplifier gain ... | 08/27/1996 |
| 5006811 | Dual quadrature frequency converter A method and apparatus for modulating or demodulating a radio frequency (RF) signal which incorporates a pair of quadrature couplers. In demodulating an RF signal, an LO signal and the RF signal are each phase shifted -90 degrees by the couplers. The RF a... | 04/09/1991 |
| 4985685 | Detector circuit including current attenuating circuit and capacitor A detector circuit comprises demodulating means for demodulating an input signal in accordance with a carrier wave applied to the demodulating means, current attenuating means coupled with the demodulating means and for attenuating a signal from the demod... | 01/15/1991 |
| 4617521 | Sample and hold demodulator with feedback for reduced riffle A demodulator circuit comprises an integrator (A1) having its input connected through a first switch (S1) to a summing point (P). A modulated carrier signal to be demodulated is applied to the summing point through an input resistor (R1). A sample-and-hol... | 10/14/1986 |
| 4614911 | Balanced modulator circuit A multiplier circuit is equipped with first and second differential amplifier circuits and a load circuit. These differential amplifier circuits are comprised of differential pairs of transistors for amplifying a first signal and outputting mutually oppos... | 09/30/1986 |
| 4507625 | Switched capacitor AM modulator/demodulator A first embodiment of an integrable switched capacitor modulator comprises a differential input operational amplifier A1 having a virtual ground potential impressed on its inverting input terminal; capacitors C1, C2 and C3; and switch means operative for ... | 03/26/1985 |
| 4504803 | Switched capacitor AM modulator/demodulator A first embodiment of an integrable switched capacitor modulator comprises a differential input operational amplifier A1 having a virtual ground potential impressed on its inverting input terminal; capacitors C1, C2 and C3; and switch means operative for ... | 03/12/1985 |
| 4500922 | Synchronous demodulation circuit for a carrier which is amplitude-modulated by a video signal A demodulation circuit comprising a high-frequency amplifier (2) and a subsequent demodulator (3) the output of which is fedback to a control input of the amplifier (2) via a keyed automatic gain control circuit (5). In addition, the output is fedback to ... | 02/19/1985 |
| 4426623 | Ripple free amplitude demodulator A pulse sample demodulator which has a first sample and hold circuit detects the peak amplitude of the time varying waveform during a short sampling interval. The first sample and hold circuit is triggered by narrow pulses produced by a circuit responsive... | 01/17/1984 |
| 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 |
| 4253066 | Synchronous detection with sampling In receiving apparatus for a double-sideband amplitude-modulated wave, a synchronous detector which samples the modulated wave for short periods centered on instants of peaks of the carrier at regularly-occurring intervals, with a sampling frequency great... | 02/24/1981 |
| 4032967 | Complementary field effect transistor signal multiplier An electrical signal multiplier comprises a pair of signal transmission gates each including a pair of parallel coupled, opposite conductivity field effect transistors. An input signal which, for example, is to be demodulated, is applied in balanced, push... | 06/28/1977 |
| 3988598 | Multipurpose semiconductor circuits utilizing a novel semiconductor device A multipurpose semiconductor circuit of the balanced type comprising a pair of differential signal transmitting paths, each of which is formed by a first transistor supplied with an input signal, a second transistor connected in series to the first transi... | 10/26/1976 |
