Abstract:
Gain control in complementary common gate and common source amplifiers is disclosed. In an exemplary embodiment, an apparatus includes a first amplifier stage (302) configured to amplify an input signal at an input terminal (316) to generate a first amplified signal (RF_OUTP). The first amplifier stage (302) includes a current diverter (702) that selectively diverts current to set a gain of the first amplifier stage (302). The apparatus also includes a second amplifier stage (304) configured to amplify the input signal at the input terminal (316) to generate a second amplified signal (RF_OUTN). The second amplifier stage (304) includes a gain control circuit (704) to set a gain of the second amplifier stage (304).
Abstract:
There is provided an integrated circuit comprising a main push-pull amplifier (108, 110) with balanced outputs and an additional push-pull amplifier (862, 863) with balanced outputs. Each of these balanced outputs is connected to an off -chip load (822) via respective bonding wires (818, 828, 830, 880) to provide a combined amplified signal to the load. The additional amplifier serves to compensate for crossover distortions generated by the main amplifier.
Abstract:
Ein Verstärkerbaustein (1) weist ein Chipgehäuse (40) und zumindest zwei Verstärkerelemente (3 1 , 3 2 ) auf. Zwischen zumindest zwei Anschlüssen (5 1 , 5 2 und 6 1 , 6 2 ) jedes Verstärkerelements (3 1 , 3 2 ) bildet sich eine parasitäre Kapazität (8 1 , 8 2 ) aus, wobei diese parasitäre Kapazität (8 1 , 8 2 ) durch ein induktives Kompensationselement (2) kompensiert ist. Das Kompensationselement (2) selbst ist dabei zwischen zwei Anschlusskontakten (10 1 , 10 2 ) außerhalb des Chipgehäuses (40) durch eine Anschlussfahne (2) ausgebildet.
Abstract:
Sterilisation apparatus arranged controllably to generate and emit hydroxyl radicals. The apparatus includes an applicator which receives RF or microwave energy, gas and water mist in a hydroxyl radical generating region. The impedance at the hydroxyl radical generating region is controlled to be high to promote creation of an ionisation discharge which in turn generates hydroxyl radicals when water mist is present. The applicator may be a coaxial assembly or waveguide. A dynamic tuning mechanism e.g. integrated in the applicator may control the impedance at the hydroxyl radical generating region. The mist and/or gas and/or energy delivery means may be integrated with each other.
Abstract:
Methods and apparatus for producing first and second drive signals from an input signal such that each drive signal is about 180 degrees out of phase with respect to the other; variably altering at least one of the first and second drive signals such that their respective magnitudes may be unbalanced to a varying degree; and producing an output signal from the first and second drive signals such that it includes harmonic distortion when the first and second drive signals are unbalanced.
Abstract:
A novel high-speed differential receiver (100) is disclosed that provides a new method and apparatus receiving and amplifying a small differential voltage with a rail-to-rail common mode voltage. The receiver output signals are differential signals with low skew and high symmetry. This high-speed differential receiver (100) is based on a common mode voltage normalization, which is based on a differential phase splitting methodology, before the resulting signal is recombined, normalized and amplified. The method involves using a differential signal splitting stage (110) followed by a common mode voltage normalization stage (130), then a controlled gain transimpedance amplification stage (150), and then amplification using one or two rail to rail amplification stages (170) that are symmetrical and balanced in nature.
Abstract:
A means of connecting a plurality of essentially identical active devices (Q1, Q2, Q3, Q4) is presented for the purpose of multifunction and multiple function operation. These devices (Q1, Q2, Q3, Q4), mounted on a chip (66), are flip-mounted to a circuit motherboard having large passive elements. A push-pull amplifier (50) is presented as an example in which the multiple function operation is the combining of amplifiers (56, 58) whose active devices (Q1, Q2, Q3, Q4) are on a single chip (66). The electromagnetic coupling, impedance matching and signal transmission are variously provided by the use of striplines (82, 88), slotlines (94, 100), coplanar waveguides (116, 130), and a slotline (180) converted into a coplanar waveguide (176, 178).
Abstract:
Certain aspects of the present disclosure generally relate to using cross-coupled transistors for source degeneration of an amplification stage. For example, the amplification stage generally includes a differential amplifier comprising transistors, cross-coupled transistors coupled to the differential amplifier, and an impedance coupled between drains of the cross-coupled transistors. In certain aspects, the differential amplifier comprises a push-pull amplifier, and the transistors of the push-pull amplifier comprise cascode-connected transistors.
Abstract:
The embodiments relate to an amplifier circuitry for an envelope modulator comprising a linear amplifier capable of receiving an input representing an envelope of a signal to be amplified; a charge storage device coupled to said amplifier for providing an amplified envelope signal for driving a load, said amplifier and charge storage device being arranged to receive a supply voltage V+; wherein the amplifier circuitry is configured such that responsive to the voltage of the input envelope signal reaching or exceeding a defined threshold value Vt, an input voltage V1 based on the voltage of the received envelope signal is provided to the amplifier to enable the charge storage device to supply a charge V3 above the supply voltage V+ such that the output voltage of the load driven by the amplifier circuitry is increased above the supply voltage V+. The embodiments also relate to an envelope modulator incorporating the above modulator and methods for amplifying an envelope signal.