34results about How to "Increased output voltage swing" patented technology

A current mirror includes a serially connected diode-connected transistor of a first conductivity type, a saturated (fully-on) transistor of a second conductivity type, and a current source for providing a reference current. A gate voltage generated by the diode-connected transistor in response to the reference current is provided to the gate of a matching transistor. This causes the matching transistor to mirror the reference current. Meanwhile, an output transistor cascoded with the matching transistor is gate-coupled to the junction between the saturated transistor and the current source. This allows the output transistor to provide an output voltage swing from one supply voltage to two saturation voltage drops from the second supply voltage. Meanwhile, the cascode configuration gives the current mirror a high output impedance.

Adaptive rail power amplifier technology processes an audio signal by feeding the audio signal to the power amplifier to produce an output signal, applying positive and negative power supply voltages centered with respect to the audio signal to the positive and negative power supply rails of the power amplifier, comparing the output signal with the positive and negative power supply rail voltages to produce dynamically varying positive and negative control signals, feeding the positive and negative control signals to positive and negative high current charge pumps and adding supplemental positive and negative voltages from the positive and negative charge pumps to the positive and negative power supply rails to produce a linear adaptive rail voltage which tracks the output signal.

For use in professional audio amplifier applications, high current charge pump circuits including charge circuits and dynamic release circuits are connected between respective storage capacitors and the audio power amplifier output. The charge circuits charge their storage capacitors when an output signal swing of the power amplifier is below a corresponding predetermined positive and negative threshold. The dynamic release circuits release power from their charged storage capacitors to dynamically vary the voltage levels of their positive and negative power supply rails in direct relation to the output signal swing of the power amplifier, preferably at unity gain. Multiple positive and negative power supply rails at different voltage levels can be used with cascaded multi-stage dynamic release circuits to maximize system efficiency. The charge and dynamic release circuits can be connected between their storage capacitors and a buffer amplifier which also receives the power amplifier audio input.

The present invention claims a fast-response charge pump circuit for a phase-locked loop, including a self-biased cascode bias circuit, a DN differential digital-to-analog conversion circuit, a replica circuit, a charge-discharge circuit, and a UP differential digital-to-analog conversion circuit . The self-biased cascode bias circuit is used to provide current bias for the core circuit of the charge pump, which effectively overcomes the channel length modulation effect of a single MOS tube and improves the matching accuracy of the charging current and discharging current of the charge pump. Compared with the cascode bias circuit, the output voltage swing of the charge pump circuit is improved, and the power supply voltage is reduced at the same time; the upper and lower current sources are used to provide the charge and discharge current, which suppresses the change of the charge / discharge current with the output voltage and improves the charge. The charging / discharging current matching range of the pump; the same type of switching tube is used as the switch of the charge pump, which effectively avoids the inherent mismatch between different switching tubes; the positive feedback mechanism is adopted to improve the response speed of the switching tube.

The invention discloses a radio-frequency power amplifier with a stack structure. The radio-frequency power amplifier comprises an input matching circuit, an output broadband matching circuit, a biasing circuit A, a biasing circuit B and a power amplification circuit, and the power amplification circuit is formed by stacking of at least two transistors with drains and sources connected. A radio-frequency signal source is connected with a grid electrode of the bottom transistor of the power amplification circuit through the input matching circuit, the biasing circuit B is connected with the grid electrode of the bottom transistor, and the source of the bottom transistor is grounded. The drain of the top transistor of the power amplification circuit is connected with a load through the output broadband matching circuit. Integral linearity, output voltage swing, operation bandwidth, power efficiency, power gain and maximum output power of the radio-frequency power amplifier are increased, and excellent second harmonic inhibition effects are achieved.

The invention discloses a CMOS low-gain wide-tuning-range fully integrated Ka-band millimeter wave quadrature voltage-controlled oscillator. A MOS variable capacitor tube array directly controlled by high and low levels is added into an oscillator resonant cavity to switch access capacitance so as to achieve multi-subband tuning for obtaining low-tuning gain, a wide regulating range, and good phase noise performance. In addition, a coplanar waveguide linear inductor used in the voltage-controlled oscillator has a high quality factor in order to achieve better phase noise performance. A circuit directly outputs a differential orthogonal signal with a high orthogonal precision (less than 1 degree). The phase noise of the voltage-controlled oscillator may reach -107.3dBc / Hz and -129.6dBc / Hz at the frequency offset 1MHz and 10MHz at the center frequency 30GHz, respectively. The voltage-controlled oscillator has total power consumption of 80mW, and can be used as a local oscillation signal source in a Ka-band wireless communication system or a voltage-controlled oscillator in a frequency synthesizer.

The invention discloses a transformer coupling radio frequency power amplifier with a wide adjustment range and a high integration level. The amplifier comprises a single-end to differential circuit, a driving power amplifier circuit, a stage matching network circuit, a power amplifier circuit array and a non-equant serial power coupling transformer unit, wherein the differential output end of the single-end to differential circuit is connected with the differential input end of the non-equant serial power coupling transformer unit via the driving power amplifier circuit, the stage matching network circuit and the power amplifier circuit array in sequence. The transformer coupling radio frequency power amplifier adopts the working mode of adjusting the power amplifier circuit array, thus achieving the wide adjustment range of the transmitting power while ensuring high efficiency of the system, and has the characteristics of wide working frequency band, simple matching circuit and high integration level. The transformer coupling radio frequency power amplifier can be widely applied to the field of radio-frequency technologies.