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 |
| 6748041 | GM cell based control loops Various circuit techniques employ a transconductance (gm) cell in control loops to implement circuits such as phase locked loops and delay locked loops that are capable of operating at ultra high frequencies with improved precision and noise performance. The gm cell... | 06/08/2004 |
| 6725463 | Dual mode tuner for co-existing digital and analog television signals A dual mode tuner/receiver is disclosed in which both analog and digital signals can be received and processed. A low pass filter allows all channels below a selected frequency enter the circuit. A precisely controlled dual conversion circuit creates an intermediate... | 04/20/2004 |
| 6718276 | Method and apparatus for characterizing frequency response on an error performance analyzer A method and apparatus for characterizing frequency response of a device under test (DUT) is disclosed. A repeated base bit pattern is received, the base bit pattern including a first transition from a 0-bit to a 1-bit. Then, using bit error rate distribution, multi... | 04/06/2004 |
| 6526113 | GM cell based control loops Various circuit techniques employ a transconductance (gm) cell in control loops to implement circuits such as phase locked loops and delay locked loops that are capable of operating at ultra high frequencies with improved precision and noise performance. ... | 02/25/2003 |
| 5949290 | Voltage controlled oscillator tuning apparatus and method A 1-port tunable frequency discriminator that is incorporated into a frequency lock loop (FLL) for providing an improved FLL having reduced phase noise and settling times is provided. The invented 1-port tunable delay line discriminator reduces the phase ... | 09/07/1999 |
| 5787134 | Switched capacitance phase locked loop system A switched capacitance phase locked loop (PLL) system includes a filter circuit having a scaling channel for scaling the phase error; an integrating channel for integrating the phase error; and a summing device for combining the scaled phase error and the... | 07/28/1998 |
| 5351275 | Digital serial loop filter for high speed control systems A digital programmable loop filter for high frequency control systems applications utilizing a serial processing technique on pulse densities. The loop filter contains a proportional signal path and an integral signal path. A 4-time-slot sequencer time-mu... | 09/27/1994 |
| 5337335 | Phase locked loop with frequency deviation detector and decoder circuit comprising such a phase locked loop A phase locked loop includes a capture aid circuit to pull the frequency of the oscillator towards the bit frequency of a data signal HFin consisting of pulses of variable lengths, each length being an integral multiple of a single bit basic le... | 08/09/1994 |
| 5313503 | Programmable high speed digital phase locked loop An improved digital phase locked loop (DPLL) has a fixed bandwidth independent of manufacturing and environmental variations. The DPLL bandwidth is optimized by monitoring the delay propagation, i.e., the "silicon speed", of the module. This information i... | 05/17/1994 |
| 4631498 | CW Laser wavemeter/frequency locking technique A wavemeter/frequency locking technique suitable for indirectly locking an optical frequency f0 to a radio frequency f1 or for locking the radio frequency to the optical frequency. A beam of optical frequency f0 is phase m... | 12/23/1986 |
| 4631499 | Phase-locked loop for a directly mixing synchronous AM-receiver A phase-locked loop is constituted by a controllable oscillator coupled through a phase detection arrangement and a low-pass filter to receive an input carrier applied to a signal input of the phase detection arrangement. In order to decrease the phase sy... | 12/23/1986 |
| 4601061 | Automatic frequency control circuit having an equalized closed loop frequency response An AFC circuit may include an oscillator having an output frequency responsive to a derived error signal, a mixer for mixing a received signal with the output of the oscillator to produce an intermediate frequency, and a signal recovery detector for recov... | 07/15/1986 |
| 4158211 | Automatic frequency control apparatus for television receiver An automatic local oscillation frequency control apparatus for a television receiver is disclosed, wherein a video intermediate frequency (VIF) signal is applied to an FM discriminator for generating an AFC voltage through a phase shifter comprised of a s... | 06/12/1979 |
| 4119925 | Frequency synthesizer with frequency modulated output A frequency synthesizer having a frequency-locked loop providing any digitally selected output frequency, and means to frequency modulate the selected output frequency at an audio rate. The frequency-locked loop includes a frequency-to-current converter c... | 10/10/1978 |
| 4055816 | Voltage stress stabilized saw device An oscillator or similar device employing a frequency setting SAW element having a piezoelectric substrate and an arrangement of interdigital finger transducers mounted thereon. In one embodiment, two interdigital finger transducers provide surface acoust... | 10/25/1977 |
