摘要:
RF transistor amplifiers include a Group III nitride-based RF transistor amplifier die that includes a semiconductor layer structure, a conductive source via that is connected to a source region of the Group III nitride-based RF transistor amplifier die, the conductive source via extending through the semiconductor layer structure, and an additional conductive via that extends through the semiconductor layer structure. A first end of the additional conductive via is connected to a first external circuit and a second end of the additional conductive via that is opposite the first end is connected to a first matching circuit.
摘要:
A radio frequency (RF) power amplifier including a driver amplifier circuit, a power amplifier circuit, an inter-stage impedance matching network connecting an output of the driver amplifier circuit to a first input of the power amplifier circuit, and a bias circuit connecting the output of the driver amplifier circuit to a second input of the power amplifier circuit. Components and techniques conducive to minimizing power consumption and achieving other benefits are employed in the RF power amplifier. The bias circuit includes an emitter follower circuit and a boost circuit that operate in tandem to dynamically counteract nonlinear distortion and other effects introduced at least in part by such components and techniques.
摘要:
An apparatus includes a differential current-to-voltage conversion circuit that includes an input sampling stage circuit, a differential integration and DC signal cancellation stage circuit, and an amplification and accumulator stage circuit. An input common mode voltage of the differential current-to-voltage circuit is independent of an output common mode voltage of the differential current-to-voltage circuit.
摘要:
A switched capacitor digital power amplifier (DPA) or a digital-to-analog converter (DAC) is disclosed. The DPA/DAC includes a plurality of switched capacitor cells connected in parallel. Each switched capacitor cell includes a capacitor and a switch. The switch selectively drives the capacitor in response to an input digital codeword. The switched capacitor cells are divided into sub-arrays and a series capacitor is inserted in series between two adjacent sub-arrays of switched capacitor cells. All the sub-arrays of switched capacitor cells may be in a unary-coded structure. Alternatively, at least one of the sub-arrays may be in a C-2C structure and at least one another sub-array may be in a unary-coded structure. The switch in the switched capacitor cells is driven by a local oscillator signal, and a phase correction buffer may be added for adjusting a delay of the local oscillator signal supplied to sub-arrays of switched capacitor cells.
摘要:
In some embodiments, an inverting amplifier includes four electrical circuit elements (or "pixels"), with two pixels used as sensing elements (115) and two pixels used as adjustable resistors for adjusting amplification factor to operate all pixels at the same amplification factor and cancelling out variations from processing. The sensing pixels include a silicon nanowire (101) exposed to liquid or gas medium for sensing, a metal electrode (105) partially open (114) for contact with the medium and used for feeding a high-frequency sinusoidal stimulation in impedance measurements and for sensing properties of the medium, implanted source and drain electrodes (102) connected to the nanowire, and electrical metal contacts (103) attached to the electrodes and connecting the pixel to an electrical circuit. The two compensation pixels include an n-type or p-type silicon nanowire, implanted source and drain electrodes connected to the nanowire, and electrical metal contacts attached to the electrodes and connecting the pixel to an electrical circuit.
摘要:
Die Erfindung betrifft einen Spannungsverstärker (100, 300), der definierte Bereiche (12, 14) eines Eingangsspannungssignals (10) in unterschiedliche Bezüge im Verhältnis zum Eingangsspannungssignal (10) zu einem oder mehreren Arbeitspunkten einer Verstärkerschaltung (130) setzt. Bei entsprechender Aufteilung der Bereiche (12, 14) des Eingangsspannungssignals (10) ist es möglich, die jeweiligen Bereiche (12, 14) linear zu verstärken. Solche linear verstärkten Ausgangssignale (191, 192, 193, 194) können sodann zum Beispiel mittels mehrerer Analog-Digital-Wandler (510) in digitale Signale (531) umgewandelt werden.
摘要:
Изобретение относится к области радиотехники и электротехники. Заявленный усилитель мощности звука включает, по меньшей мере, два каскада, каждый из которых содержит по две транзисторные пары Дарлингтона с входными и выходными транзисторами, разделяющий транзистор, динамическую головку, блок формирования напряжения смещения, двуполярный блок питания, причем каскады в точке входа исходного сигнала и выхода усиленного сигнала симметрично подключены друг к другу эмиттерами противоположных полярностей выходных транзисторов транзисторных пар Дарлингтона и в этой же точке подключены к динамической головке, другой вывод которой присоединен к общему проводу двуполярного блока питания, при этом каждый каскад снабжен отдельным блоком формирования напряжения смещения и блоком питания, причем каждый блок формирования напряжения смещения содержит стабилизатор, который через подстроечный резистор связан с соответствующей базой транзисторных пар Дарлингтона, а каждый блок питания включает фильтрующие конденсаторы.
摘要:
An integrated DC blocking amplifier circuit (100), including: an operational amplifier (110) configured in a differential amplifier; and at least first and second two-stage switched-capacitor circuits, each two stage switched-capacitor circuit including a first-stage circuit(140,144) and a second-stage circuit (142,146), wherein the first two-stage switched capacitor circuit is connected to a positive feedback path of the operational amplifier and the second two-stage switched capacitor circuit is connected to a negative feedback path of the operational amplifier, wherein the first-stage circuit is switched at a relatively low switching frequency, while the second-stage circuit is switched at a relatively high switching frequency.