Did You Know...
...that in the early 1940s GE engineer James Wright was charged with a task of utmost importance to the war effort: develop a cheap substitute for rubber that could be used to produce tires, gas masks and a whole host of military gear. Wright tackled the task diligently -- and wound up inventing Silly Putty.
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| Number | Title | Issue Date |
| 7394874 | Up/down conversion circuitry for radio transceiver A multi-channel RF receiver uses an image rejection mixer (e.g. double quadrature mixer) in the IF down conversion stage for image side band rejection (whereby use of an IF narrow band filter for image rejection may be omitted if desired) and comprises a simplified ... | 07/01/2008 |
| 7194044 | Up/down conversion circuitry for radio transceiver A multi-channel RF receiver uses an image rejection mixer (e.g. double quadrature mixer) in the IF down conversion stage for image side band rejection (whereby use of an IF narrow band filter for image rejection may be omitted if desired) and comprises a simplified ... | 03/20/2007 |
| 7138857 | Signal processing device for mobile radio A signal processing device includes a conversion device configured to output a differential current signal at two taps on the basis of an input signal and an oscillator signal. A respective controllable current source is coupled to one of the two taps. An amplificat... | 11/21/2006 |
| 6965653 | Circuit and method for processing an automatic frequency control signal An integrated demodulator tuning circuit (10, 60) receives differential currents at input terminals (12, 46) and provides an AFC signal at an output terminal (48). The AFC current characteristic has a dead band (72) in the output current ... | 11/15/2005 |
| 6369647 | Demodulator circuit and method of tuning A demodulator circuit (10) includes an oscillator (12) and an injection circuit (14). An Automatic Frequency Control (AFC) signal adjusts the tail current of a current source (28) provided in the oscillator (12) and the tail current of a current source (4... | 04/09/2002 |
| 6356599 | AFC device and method of controlling reception frequency in a dual-mode terminal An AFC (Automatic Frequency Control) device and a method of controlling reception frequency in a dual-mode terminal. When a dual-mode terminal uses one or two AFC devices, the time required for acquiring tracking synchronization in a PLL circuit for a fir... | 03/12/2002 |
| 6133802 | Synchronous carrier recovery circuit and injection locked oscillator A simple carrier recovery circuit capable of accurately detecting and synchronizing an incoming carrier frequency without the use of a phase locked loop (PLL) is provided. Instead of a PLL, the carrier recovery circuit includes an injection locked oscilla... | 10/17/2000 |
| 6035002 | Digital super-regenerative detector RF receiver A digital super-regenerative receiver is provided having an analog RF detector and a regenerative oscillator. The output of the RF detector is used to generate a digital signal from which the oscillator bias is adjusted, in order to maintain the oscillato... | 03/07/2000 |
| 5731745 | High frequency oscillator circuits operable as frequency modulators and demodulators The high frequency circuit includes an oscillator connected in a Colpitts configuration. Negative feedback to the oscillator is applied through an amplifier, both to stabilize the circuit and to permit frequency modulation of the carrier signal generated ... | 03/24/1998 |
| 5650749 | FM demodulator using injection locked oscillator having tuning feedback and linearizing feedback A demodulator circuit (100) and method for producing a demodulated signal VOUT from an input signal VIN. A frequency detection circuit (101) produces a quadrature signal VQUAD which is compared to the input signal VIN... | 07/22/1997 |
| 5239585 | Devices, systems, and methods for composite signal decoding Generally, and in one form of the invention, a composite signal decoder (60) is disclosed which does not require synchronizing the sampling rate to the phase of the incoming pilot signal. Curve fitting filter (126) up-samples and interpolates the incoming... | 08/24/1993 |
| 4928068 | FM demodulator An FM demodulator circuit uses an oscillator to provide a switch control signal synchronized to an FM signal, and a current supply to provide differentially alternating currents at first and second outputs flowing through a commutator circuit to the first... | 05/22/1990 |
| 4749964 | Superregenerative detector having a saw device in the feedback circuit A superregenerative detector utilizing a single transistor and having a surface acoustic wave device in the feed back loop coupling the output to the input to cause oscillation wherein the surface acoustic wave device is a low loss delay line formed as a ... | 06/07/1988 |
| 4746873 | FM demodulators Apparatus for obtaining programmable threshold extension of an FM demodulator comprises a limiter preamplifier 4 and a variable gain buffer amplifier 6. The buffer amplifier 6 is provided with an external control node 16 such that the signal level fed fro... | 05/24/1988 |
| 4007426 | F-M Demodulator circuit An F-M demodulator circuit including a multivibrator and a differential amplifier that have common output electrodes and a capacitor thereacross demodulates a frequency modulated signal differentially applied to input electrodes of the amplifier. The stat... | 02/08/1977 |
