Frequency modulated integrator circuit

摘要

A modulated integrator circuit frequency modulates an input signal and has an integrator comprised of an amplifier (31) and an intregrating capacitor (35) connected across an input and an output of the amplifier. The circuit further comprises a storage capacitor (36) in addition to any switching capacitors (C) associated with the modulation of the input signal if present. The storage means (36) is connectable between the input and the output of the amplifier in parallel with the integrating capacitor. The storage capacitor stores a charge associated with the voltage of the output of the amplifier and transfer such charge to the integrating capacitor to enable reversal of the charge of the integrating capacitor in synchronism with the frequency modulation of the input signal.