Frequency deviation measurement based on two-arm (delta)-(sigma) modulated bridge

A method of frequency deviation measurement is presented. The use of a two-arm bridge is based on the use of delta-sigma ((delta)-(sigma)) modulation and arithmetic operations on two synchronous (delta)-(sigma) modulated pulse streams. The simulation results indicate a good linear relationship between frequency deviation and pulse count over the operating range. Stability of the clock and components mismatch of the (delta)-(sigma) modulator are not critical for operation. Performance comparisons with existing solutions are given.