A CMOS voltage-to-frequency converter with output frequency range programmability

This paper represents the design of a low-cost programmable CMOS voltage-to-frequency converter suitable for wireless sensor nodes signal conditioning. Designed in a 0.18μm CMOS technology supplied at 1.8V, it operates for a 0.0-1.6V input voltage with power consumption below 0.41mW. Three different output frequency ranges can be digitally selected: 0.0 to 0.5MHz, 0.0 to 1MHz or 0.0 to 1.5MHz. The accuracy achieved is better than 3%, with linearity errors below 0.04%.