Method of amplitude-frequency conversion and a converter which operates in accordance with said method

An amplitude-frequency coverter which comprises:

• an amplitude-current conversion circuit which receives the signal to the converted,
• an integrating circuit which is provided with resetting means and which receives said current and developes an integration voltage corresponding to the integral of said current,
• a switching circuit connecting the integrating circuit to said conversion circuit and having open and closed states which define the stopping and starting of the integrations,
• a bistable threshold circuit which receives said integration voltage and is adjusted so as to begin to change state when it receives an integration voltage equal to a threshold voltage having the value V.sub.0,
• a logic circuit for forming control signals and synchronized with the reversal-of-state action of said threshold circuit, said logic circuit being intended to deliver control signals for said switching circuit and control signals for said resetting means,
• wherein said converter further comprises:
• a source of voltage having a reference value V".sub.0 ,
• a circuit for controlling in dependence on said reference value V".sub.0 the maximum integration voltage V'.sub.0 which is really attained at the instant of stopping of an integration, the output of said integration-voltage control circuit being intended to deliver said threshold voltage V.sub.0 and being connected to said bistable threshold circuit.