9 results about "Open-loop gain" patented technology

The application relates to a voltage follower-based addressable sensitive amplifier test circuit, which comprises: a sensitive amplifier array to be tested, the array comprising a plurality of sensitive amplifiers to be tested; an addressing circuit for providing an address signal to select a target sensitive amplifier; a switch selection circuit connected between the sensitive amplifier array to be tested and an external test node, controlled by the addressing circuit, for coupling the signal of the external test node to the selected sensitive amplifier; and a voltage follower module with an input end connected to the switch selection circuit, for transmitting the test voltage output by the switch selection circuit to the corresponding end of the selected sensitive amplifier. The application can realize efficient and accurate SA performance testing. The node voltage curve is only affected by the gain of the operational amplifier, and the design open-loop gain is above 60 dB, so that an error below 0.1% can be realized.

A supply voltage may be set using a local voltage regulator, such as a Digital Linear Voltage Regulators (DLVR). A DLVR may include a compensator, and the performance of the compensator may be affected by a dropout (DO) voltage. To improve the performance of a compensator, a number of compensator calculations may be pre-calculated to reduce the complexity of remaining real-time computations and enable compensator calculations to be completed within a single DLVR clock cycle. A DLVR may include a sense filter, and the DLVR transfer function (TF) may be modified using dynamic shaping of open loop gain and pole locations of a sense filter. The DO range associated with the DLVR TF may be changed according to a monitored DO(t) to reduce the sensitivity of a domain VMIN on dropout, which reduces power consumption, increases performance, and enables simplification of test flows.

The application discloses a kind of broadband solid-state power amplifier and pulse modulation method, belong to amplifier technical field, including amplifier unit, detection control unit, power module and power detection module, it solves the technical problem of improving the protection of GaN power device in high-power power amplifier, accurate control amplitude and improve the maintainability of modularity, the local grid negative voltage management of the present application is realized, power-on power-down timing control, drain pulse modulation and temperature monitoring, effectively avoid GaN chip damage due to power timing error or local overheating, significantly improve the reliability of the whole machine, support open-loop gain control and closed-loop automatic level control ALC two modes, effectively reduce the impact of pulse current on power bus, improve the flatness of output pulse top, ensure the consistency of each unit radio frequency phase and power supply timing, improve the synthesis efficiency, can be quickly positioned and replaced, greatly reduce the average repair time, improve the availability and usability of equipment.

The application provides a power semiconductor circuit and chip, the circuit comprises a chip, a channel is arranged in the chip, the circuit further comprises a flip voltage follower (FVF) used as a voltage buffer to ensure stable current output in the circuit, a compensation unit electrically connected to the two ends of the flip voltage follower (FVF) to ensure loop stability without output capacitor, and a non-inverting gain stage electrically connected to a power input end (VIN), a ground wire (GND) and the flip voltage follower (FVF) respectively to offset the channel length modulation effect during operation of the chip by increasing open-loop gain. The power semiconductor circuit and chip can effectively optimize the structure of the power semiconductor circuit, so that the circuit can meet the condition of no output capacitor and has the characteristics of high stability and high gain.

The application discloses an analog fast automatic gain control circuit for a transimpedance amplifier, and belongs to the field of optical communication transimpedance amplifiers. The technical scheme introduces a gain compensation unit in a feedback loop, and comprises an operational amplifier A2, a resistor R2, a MOS tube M1, a MOS tube M2, a resistor R1, a current source, a MOS tube M3, a resistor R3, and a capacitor C2. When the MOS tube M1 works in a linear region, the equivalent resistance is reduced, and the source stage negative feedback circuit cooperates to compensate for the transconductance reduction of the controlled gain adjustment element, so that the open loop gain of the automatic gain control loop is maintained stable. The scheme solves the problem that the response time of the traditional analog automatic gain control is inconsistent when the input signal amplitude changes, realizes consistent loop response time under different input amplitudes, significantly improves the upper limit of the circuit response speed design, avoids the defect that the output amplitude suddenly changes when the digital gain control scheme is switched, and ensures the output stability and high-speed performance.

A method for determining the stability of a multi-voltage-level DC distribution system containing multiple DC microgrids is disclosed. The method first confirms that the equivalent admittance of each microgrid subsystem has no right-half-plane poles based on the specific control mode of the interconnecting converter and the equivalent open-loop gain of each microgrid operating independently. Second, based on the two-port network matrix of the interconnecting converter, the multi-voltage-level DC distribution system containing multiple DC microgrids is simplified to a single-bus DC system containing only the distribution bus. The stability of the entire system is then determined using the equivalent impedance ratio. Under the premise that each unit within the system can operate stably independently, the stability of the entire system is guaranteed when the equivalent open-loop gain of each microgrid operating independently and the equivalent impedance ratio on the distribution bus side both satisfy the Nyquist criterion. This invention utilizes the equivalent open-loop gain of each DC microgrid operating independently and the equivalent impedance ratio of the system on the distribution bus side to analyze the stability of a multi-voltage-level DC distribution system containing multiple DC microgrids. It has good flexibility and applicability, and can provide a reliable theoretical basis for the design of multi-voltage-level DC distribution systems.

The invention discloses a novel high-precision low-dropout linear voltage regulator, and belongs to the technical field of analog integrated circuits, the novel high-precision low-dropout linear voltage regulator comprises an amplification stage, an output stage, a power stage, a pre-regulator and a frequency compensation technology, the amplification stage, the output stage and the power stage provide high open-loop gain, and the linear regulation rate and the load regulation rate are effectively improved; the pre-voltage stabilizer prevents power supply voltage ripples or noise from being transmitted to output voltage, so that the power supply rejection ratio is increased; the frequency compensation technology can ensure the stability of the amplifier to different capacitive loads under high open-loop gain. The high-precision reference driver has the advantage of high precision and is suitable for high-precision reference drivers.

The invention discloses a low-noise high-gain operational amplifier circuit, which belongs to the technical field of analog integrated circuits and mainly comprises a main operational amplifier module, an auxiliary operational amplifier module, a biasing circuit module and a chopper circuit module. The main operational amplifier adopts a two-stage operational amplifier structure, the first stage is a folded cascode structure, and the second stage is a class AB structure; the auxiliary operational amplifier A1 and the auxiliary operational amplifier A2 are respectively composed of folding cascode input by a P tube and a N tube, so that the overall gain is improved; the bias circuit provides proper bias voltage for the main operational amplifier and the auxiliary operational amplifier; the chopper circuit significantly reduces the offset voltage and low-frequency noise of the operational amplifier. The amplifier has good stability and relatively high output swing, realizes extremely high direct-current open-loop gain, relatively low input reference noise and good frequency stability, and is suitable for being used in analog front-end programmable gain amplifier circuits and analog signal processing systems with extremely high requirements on signal precision and signal-to-noise ratio.

In order to provide a high voltage amplifier that operates stably at high speed, and a mass spectrometry device that comprises the same, the present invention is configured in the following manner.　This high voltage amplifier comprises: an error amplification circuit that outputs a control signal on the basis of an input signal and a feedback signal; a voltage conversion circuit that adjusts the potential of the control signal outputted from the error amplification circuit; a multistage transistor output circuit that, on the basis of the output of the voltage conversion circuit, outputs a high voltage for supply; a feedback circuit that, on the basis of the high voltage for supply, outputs the feedback signal to be inputted to the error amplification circuit; and an open loop gain control circuit that has a plurality of resistance elements and a capacitance element, said capacitance element being connected in parallel with at least one resistance element among the plurality of resistance elements and adding a pole and a zero point to the open loop gain, and generates a gain control signal for controlling the voltage conversion circuit on the basis of the high voltage for supply outputted from the multistage transistor output circuit. This mass spectrometer comprises said high voltage amplifier.