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| Number | Title | Issue Date |
| 7184503 | Multi-loop circuit capable of providing a delayed clock in phase locked loops A multi-loop circuit includes a first switching device to receive a first clock pulse and a second delayed pulse and produce a first output pulse including either the first clock pulse or the second delayed pulse. A first delay device receives the first output pulse... | 02/27/2007 |
| 6891420 | Method and apparatus for digital frequency synthesis A digital frequency synthesizer includes one or more reference clocks (104, 1316, 1502A, 1504A, 1506A) optionally coupled through one or more pulse width reducers (106) to one or more main delay lines (108, 702, 1502B, 1504B... | 05/10/2005 |
| 6400187 | Precision, low-power transimpedance circuit with differential current sense inputs and single ended voltage output A transimpedance circuit adapted for use in a subscriber line interface circuit includes sense resistors installed in closed loop, negative feedback paths of respective sense amplifiers. Voltage drops across the sense resistors are applied to first and se... | 06/04/2002 |
| 5708379 | Electronically programmable output impedance circuit A method and apparatus for generating an AC voltage with user defined inductance and resistance values in series therewith is described. The output voltage of the AC source is sampled and a signal indicative of the total current being generated is derived... | 01/13/1998 |
| 5389869 | Power control system for an A.C. induction motor A power factor control system for an A.C. induction motor determines the difference in phase between the voltage applied to the motor and the current drawn by the motor. Based upon this difference in phase, an integrator generates an error signal. The err... | 02/14/1995 |
| 4916331 | Synchronized input latch circuit with conditioning circuits for AC inputs An AC input conditioning circuit comprises a latch circuit, one or more latch conditioning channels, and a latch synchronizing circuit that is coupled to an AC source and has an output supplying a latch enable pulse to the latch enable terminal of the lat... | 04/10/1990 |
| 4703197 | Phase-controlled power switching circuit The application of a controlled amount of alternating current (AC) power to an electrical load is achieved in a power switching circuit utilizing phase-control. In the switching circuit, a first analog signal is generated and repeats in every half-cycle o... | 10/27/1987 |
| 4250432 | Touch dimmer circuit A touch dimmer switch incorporating an integrated circuit for controlling a thyristor dimming circuit, has a touch control connected in a high impedance, unidirectionally conducting circuit, and a filter circuit for filtering out ambient electrical noise.... | 02/10/1981 |
| 4158164 | Phase control of power to a load using a single capacitor In the control of power supplied to a load from an a.c. power source by varying the phase angle of the a.c. power alternation at which conduction is initiated, conduction triggering pulses are generated by the use of a single capacitor which is first char... | 06/12/1979 |
| 4063146 | Digital firing control for a converter A digital firing control for a three-phase full wave silicon controlled rectifier converter. An error signal, in digital form, representing a desired change in firing angle which is a function of the difference between the current being supplied by the co... | 12/13/1977 |
| 4048520 | Three-phase SCR drive circuit using an opto-coupled pulse amplifier A three-phase shift network includes a single transistor which controls phase shift by introducing a variable resistance into the network as determined by a D.C. control signal supplied to the transistor. The three-phase signals generated from the phase s... | 09/13/1977 |
| 4023088 | Radiation-to-a.c. converter A radiation-to-electrical energy converter in which transmission of radiation from a radiation source is controlled by radiation gates to alternate the build up of positive potential on a pair of radiant energy absorbers and in which the positive potentia... | 05/10/1977 |
