Abstract: A transmission frontend includes a modulator configured to generate a modulated signal. A first selectable path is electrically coupled to the modulator and is configured to generate a first signal having a first power level. A second selectable path is electrically coupled to the modulator and is configured to generate a second signal having a second power level. The first power level is greater than the second power level. A transformer is electrically coupled to each of the first selectable path and the second selectable path. An antenna is electrically coupled to the transformer.
Abstract: Very high frequency circuits suffer from parasitic resistances. At 60 GHz, conventional layout techniques can introduce loss into the circuit at critical locations. One critical interconnect between the output of a pre-driver and the gate of the final output stage causes 1 or 2 dB of loss due to the layout. By minimizing the number of via contacts, this conventional loss can be recovered using this new layout technique. In addition, a tap point of a via stack is used to modify the resonant characteristics of the interconnect. Finally, cross coupled devices in a resonant circuit are used to reduce the common mode noise at the expense of the common mode gain.
Abstract: An amplifier has first and second differential outputs connected to first and second ends of one side of a balun. A second side of the balun, inductively coupled to the first side of the balun, has a center tap that is electrically coupled to a conductive path to a power supply reference node for the amplifier.
Abstract: The present disclosure relates to coupled circuits and methods of coupling circuits having a power supply wherein a plurality of transistors are inductively coupled directly to the power supply for providing a single DC supply voltage directly to each of the plurality of transistors, and wherein a plurality of transformers have primary and secondary windings, the primary and secondary windings providing, at least in part, inductive loads for inductively coupling the plurality of transistors to the power supply, the plurality of transformers also providing an AC signal path for coupling neighboring ones of the plurality of transistors together.
August 2, 2006
Date of Patent:
September 20, 2011
The Regents of the University of California
Mau-Chung Frank Chang, Daquan Huang, Tim Richard LaRocca
Abstract: A power amplifier system in accordance with an example embodiment can utilize a transformer having a primary winding inductively coupled to a secondary winding, where the primary winding includes a center tap between a first port and a second port, where the secondary winding includes a third port and a fourth port, where the primary winding receives a first output from a first amplifier, where the center tap receives a second output from a second amplifier.
Abstract: A high frequency signal detection circuit includes an input terminal for a high frequency signal to be detected, a switch transferring the high frequency signal as intermittent ringing signal to a first node in response to a pulse signal whose frequency is lower than that of the high frequency signal, a transistor amplifying the signal at the first node, and outputting to a second node, a bias generator generating a bias voltage by which the transistor is operated in its weak inversion region, a resonant circuit outputting the bias voltage to the first node, and resonating the high frequency signal, a capacitor removing a high frequency component of the signal at the second node; and a judgment circuit judging whether or not the high frequency signal is inputted by detecting the signal at the second node, which has the same frequency as the pulse signal.
Abstract: A system and method for determining dispersion of intermodulation power in a satellite communication system or any other system which can be mathematically modeled as a matrix multiplication followed by an instantaneous nonlinearity and another matrix multiplication include determining a matrix (V) representing amplitudes and frequencies of signals generated by a digital processor and input to a plurality of amplifiers. A matrix (M) representing signal propagation from the amplifiers to a destination is used to determine the intermodulation power at the destination within each transmitted beam at each intermodulation distortion frequency. The intermodulation distortion frequencies are determined based on sums and differences of component frequencies corresponding to the user signals.
Abstract: The present invention pertains to an orthopedic device for immobilizing an appendage of a patient. The orthopedic device includes a linkage and a first member fixedly secured to the linkage. The first member has a side and an open region defined in the side. The orthopedic device also includes a second member which is slidingly secured to the linkage. The second member is capable of sliding along the linkage to be positioned adjacent the first member. The second member has a first side and a first open region defined in the first side. The first open region of the second member communicates with the open region of the first member when the second member is adjacent to the first member such that the first and second members are capable of being positioned about the appendage through the open regions of the first and second members.
Abstract: A time averaging circuit which increases significantly the signal to noise ratio of a received signal. The output of a multiplier which provides near D.C. signals with the noise is fed to a metal core transformer through an operational amplifier. The secondary winding output of the transformer is partly subtracted from the input in the operational amplifier, enhancing the D.C.-like signal components. Time integration via the feed back loop results in the A.C. noise components being relatively reduced in amplitude. The A.C. noise components from the secondary of the transformer and the output of the operational amplifier are subtracted in a second operational amplifier, the output signal of which has substantially increased signal to noise ratio. A pre-processing circuit includes a multiplier which multiplies the received signal with a narrow band-width portion thereof, tuned to the signal frequency, which enriches the near D.C. energy.
December 23, 1976
Date of Patent:
February 5, 1985
Her Majesty the Queen in right of Canada, as represented by the Minister of National Defence