Method and circuit for compensation control of offset voltages of a radio receiving circuit integrated in a circuit module

A method of compensating for offset voltages in a baseband of a radio receiving circuit integrated in a circuit module and operating in a time division multiplex method with reception time slots, the method which comprises the following steps:

• feeding a baseband output signal to a controllable sample operational amplifier;
• charging or discharging an external capacitor depending on a polarity of an offset voltage, by activating a sampling switch of a sample-and-hold circuit in accordance with an offset compensation enable control signal before each reception time slot for a defined period of time;
• comparing a voltage of the capacitor with a reference voltage internally in the module with a differential amplifier;
• generating a compensation current counteracting the offset voltage with the capacitor;
• determining a charge state of the capacitor internally in the module, and, when the capacitor charge is substantially below a typical charge state, increasing the charging current to the capacitor with the controllable sample operational amplifier, and reducing the charging current back to a normal charging current when the charge state of the capacitor attains a charge in the typical charge state range.