Integrator that prevents signal saturation for analog-to-digital converters (ADCs)

The analog integrator is a fundamental component in analog-to-digital converters (ADCs), control systems, and analog computers. However, input signals with high amplitudes may cause conventional analog integrators to produce an output that becomes saturated at the supply voltage. In this case, the output signal does not accurately reflect the input. This technology employs a mixed signal analog-digital circuit to prevent output saturation, resulting in a more accurate signal.

Mixed signal analog-digital circuit to prevent saturation

This technology achieves a more accurate final signal by employing a mixed signal analog-digital circuit. Part of the signal is computed by a digital counter, while the remaining portion is computed by an analog integrator. When the output reaches a threshold value, the input signal’s sign is reversed and the digital counter adjusted so as to switch the direction of the output and prevent saturation. In contrast to other saturation prevention techniques, this technology obviates the need for a capacitor-based output reset. Eliminating the need for a capacitor reduces the power requirements of the circuit and eliminates a potential source of noise.

The technology has been successfully tested using circuit simulation.

Lab Director:

Yannis Tsividis, Ph.D.

Applications:

• Analog integrator circuits
• Simplification of analog circuit design
• Analog-digital (hybrid) computation

Advantages:

• Reduces the power requirements of integrators as compared to capacitor-reset-based devices
• Eliminates a potential source of noise by avoiding the use of a reset capacitor

Patent Information:

Patent Issued

Tech Ventures Reference: IR CU13048