9-Bit-cmos-converter

Description: Three CD4007 A integrated circuit packages perform the switching function using a 10-V logic level. A single 15-V supply provides a positive bus for the follower amplifier and powers the CA3085 voltage regulator. The scale adjustment function is facilitated by the regulator output control, which is set to a nominal 10 V in this system. The line-voltage regulation, approximately 0.2%, allows for 9-bit accuracy to be maintained despite variations of several volts in the supply. System power consumption ranges between 70 and 200 mW, with a significant portion dissipated in the load resistor and operational amplifier. The regulated supply provides a maximum current of 440 µA, of which 370 µA flows through the scale adjustment. The resistor ladder consists of 1% tolerance metal oxide film resistors, with a ratio match between resistance values on the order of 2%. The follower amplifier has the offset adjustment nulled at approximately a 1 V output level.

The circuit employs three CD4007 A integrated circuits, which are configured to operate as switches controlled by a 10-V logic level. This logic level allows for reliable switching characteristics suitable for digital applications. The power supply for the circuit is a single 15-V source, which serves a dual purpose: it provides a positive bus voltage for the follower amplifier and powers the CA3085 voltage regulator. This regulator is critical for maintaining stable voltage levels throughout the circuit, ensuring that the output remains consistent even with fluctuations in the input supply.

The scale adjustment feature is implemented through the output control of the voltage regulator, which is calibrated to a nominal output of 10 V. This precise voltage is essential for the accurate functioning of the system, as it allows for fine-tuning of the output signal. The line-voltage regulation of approximately 0.2% is particularly noteworthy, as it indicates the system's ability to maintain high accuracy (9-bit) even when the supply voltage varies by several volts. This robustness against supply variations is crucial in applications where precision is paramount.

Power consumption is a critical aspect of circuit design, and this system operates within a range of 70 to 200 mW. The majority of this power is dissipated in the load resistor and the operational amplifier, highlighting the importance of thermal management in the design. The regulated output from the CA3085 voltage regulator can supply a maximum current of 440 µA, with 370 µA dedicated to the scale adjustment function. This distribution of current is vital for ensuring that the scale adjustment can be performed effectively without compromising the overall system performance.

The resistor ladder utilized in this circuit consists of 1% tolerance metal oxide film resistors. This choice of resistors provides a high degree of accuracy and stability in resistance values, which is essential for the precision of the scale adjustment. The matching ratio between resistor values is maintained within 2%, ensuring that the circuit operates as intended without significant discrepancies in the output.

Finally, the follower amplifier in this system has been designed with an offset adjustment that is nulled at approximately 1 V output level. This adjustment is crucial for eliminating any unwanted DC offset that could affect the accuracy of the output signal. By ensuring that the output is centered around this level, the circuit can achieve better performance and reliability in its intended applications.Three CD4007 A IC packages perform the switch function using a 10-V logic level. A single 15-V supply provides a positive bus for the follower amplifier and feeds the CA3085 voltage regulator. The scale adjust function is provided by the regulator output control, which is set to a nominal10 V in this system.

The line-voltage regulation (approximately 0.2%) permits 9-bit accuracy to be maintained with a variation of several volts in the supply. System power consumption ranges between 70 and 200 mW; a major portion is dissipated in the load resistor and op amp.

The regulated supply provides a maximum current of 440 p,A of which 370 p,A flows through the scale adjusting. The resistor ladder is composed of 1 % tolerance metaloxide film resistors. The ratio match between resistance values is in the order of 2%. The follower ampliiier has the offset adjustment nulled at approximately a 1 V output level.