High performance integrated CMOS frequency-to-voltage converter

Abstract

In this paper we present a new high performance frequency-to-voltage converter (FVC) dedicated for integrated CMOS mixed-signal (analog/digital) applications. The circuit is very fast and requires a very small silicon area for integration. The output voltage generated by this FVC does not present any AC ripples and is proportional to the period of a square wave form input signal. The time response of this FVC is very small and is approximately equal to eight cycles of the input signal within a precision of 0.4%. The circuit can operate theoretically up to 100 MHz and its operating frequency range can easily be changed.