CV Amplifier

The CV amplifier controls the output of the power module when the module is operating in constant voltage mode. The CV amplifier consists of two stages: an error amplifier stage and a voltage monitor stage. The calibrated CVPROG* signal from the CV DAC pulls current out of the negative input of the error amplifier at a rate determined by the DAC’s programmed value. The error amplifier in turn, controls the output of the module.

The output of the module is monitored by the voltage monitor stage. It reduces the module’s output voltage so that the 0 to full-scale output voltage of the module is represented by a range of 0 to 2 volts at the output of the voltage monitor amplifier. The voltage monitor amplifier’s output (VMON) is fed through a resistor to develop a current. This current is fed into the negative input of the error amplifier stage at the same time that current is being pulled out of this input by the CVPROG* signal from the CV DAC.

When the current pulled out of the error amplifier input by the CV DAC exceeds the current fed into the input by the voltage monitor, the error amplifier turns on, which turns the output of the module on. When the current pulled out of the error amplifier input by the CV DAC is less than the current fed into the input by the voltage monitor, the error amplifier turns off, which turns off the output of the module. When the current pulled out of the error amplifier input by the CV DAC is equal to the current fed into the input by the voltage monitor, the net current into the error amplifier is zero. At this point, there is no change on the output voltage of the power module because the output voltage equals the programmed voltage value.

CC Amplifier

The CC amplifier controls the output of the power module when the module is operating in constant current mode. The CC amplifier also consists of two stages: an error amplifier stage, and a current monitor stage. The calibrated CCPROG* signal from the CC DAC pulls current out of the negative input of the error amplifier at a rate determined by the DAC’s programmed value. The error amplifier in turn, controls the output of the module.

The current monitor stage monitors the current at the output of the module by sensing the voltage drop across current monitor resistor (RM). The current monitor amplifies this voltage (which is typically in the range of 0 to 50mV) so that the 0 to full-scale current output of the module is represented by a range of 0 to 2 volts at the output of the current monitor amplifier. The current monitor amplifier’s output (IMON) is fed through a resistor to develop a current. This current is fed into the negative input of the error amplifier stage at the same time that current is being pulled out of this input by the CCPROG* signal from the CC DAC.

When the current pulled out of the error amplifier input by the CC DAC exceeds the current fed into the input by the current monitor, the error amplifier turns on, which turns on the output of the module. When the current pulled out of the error amplifier input by the CC DAC is less than the current fed into the input by the current monitor, the error amplifier turns off, which turns off the output of the module. When the current pulled out of the error amplifier input by the CC DAC is equal to the current fed into the input by the current monitor, the net current into the error amplifier is zero. At this point, there is no change on the output current of the power module because the output current equals the programmed current value.

OR Gates

The outputs of the CV and CC amplifiers are "or"ed through two diodes, producing a single pulse-width modulator control signal (VCNTRL). Whichever of the two signals (CC or CV) is the most negative, with respect to the output of the module, controls the pulse-width modulator. The pulse-width modulator in turn controls the FETS. The more negative that the controlling signal is with respect to the output, the harder it causes the pulse-width modulators to turn on the FETs.

Theory Of Operation 63

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Agilent Technologies 6610XA appendix CV Amplifier, CC Amplifier, Or Gates
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6610XA specifications

Agilent Technologies has long been recognized for its innovative contributions to the fields of measurement and testing, and the Agilent 6610XA series of power supplies is no exception. Tailored for demanding applications in electronics and advanced research, the 6610XA series exemplifies cutting-edge technology blended with user-friendly features.

One of the main characteristics of the Agilent 6610XA is its ability to provide a stable, accurate, and reliable power supply across a range of applications. With output voltages that can reach as high as 60V and currents up to 10A, the device is versatile enough to cater to a variety of testing requirements. This power supply is ideal for applications including semiconductor testing, device characterization, and more, where precision and consistency are paramount.

Among the standout features of the Agilent 6610XA is its advanced graphical user interface (GUI), which enhances the overall user experience. The intuitive design allows engineers and technicians to monitor and control voltage and current settings easily, making the process of configuring the device both fast and efficient. Additionally, the device has built-in measurement capabilities that can display real-time voltage and current readings, significantly aiding in troubleshooting and performance evaluation.

Furthermore, the 6610XA incorporates a range of communication interfaces including USB, LAN, and GPIB, making it highly adaptable for integration into various automated test setups. This versatility signifies that the power supply can be seamlessly incorporated into existing laboratory environments, promoting productivity and efficiency.

The series also incorporates intelligent protection mechanisms to ensure both user safety and equipment longevity. Features such as overvoltage protection (OVP) and overcurrent protection (OCP) are designed to prevent accidental overloads, safeguarding both the device under test and the power supply itself.

Another key aspect is the series' capability to perform complex programming tasks with ease. With programming capabilities that enable users to set intricate voltage and current profiles, the device supports advanced applications, including load transient testing and sweep testing. This flexibility makes the Agilent 6610XA a valuable asset for any research and development environment looking to enhance testing efficiency and accuracy.

In conclusion, the Agilent 6610XA series power supply stands out for its combination of precision, user-friendliness, advanced communication capabilities, and safety features. These attributes make it a critical tool for engineers and researchers engaged in the rigorous demands of modern electronics testing and evaluation. With its continued commitment to innovation, Agilent Technologies reinforces its position as a leader in providing high-quality solutions for the measurement and testing industry.
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