Frequency modulated integrator circuit.

摘要

A modulated integrator circuit including a means ( phi in, phi ch, phi ma, phi dec, C) for frequency modulating an input signal and an integrator means comprising an amplifier (31) and an intregrating capacitor (35) connected across an input and an output of the amplifier, characterised in that the circuit further comprises a storage means (36) in addition to any switching capacitors (C) associated with the modulation of the input signal if present, the storage means (36) being connectable between the input and the output of the amplifier in parallel with the integrating capacitor and operable to store charge associated with the voltage of the output of the amplifier and to 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.