Patent ID: 7068117

Claim:
A method of suppressing supply voltage ripple in an output of a tuner oscillator stage, the tuner oscillator stage comprising: a transistor having a control electrode, and two electrodes of a main current path, a first impedance being coupled between the control electrode and a first terminal, a second impedance being coupled between the control electrode and a second terminal, a third impedance being coupled between one of the two electrodes of the main current path and the second terminal, and an element being arranged in series with the second impedance, the element having a low impedance for AC current and a well-defined voltage drop for DC current, the first and the second terminal being arranged to receive a power supply voltage, the method comprising the steps of: allowing a first ripple occurring in a power supply voltage at the first terminal to be applied to said control electrode of said transistor, whereby said transistor passes said first ripple; and combining, at an output of said tuner oscillaton stage, said first ripple with a second ripple occurring in a power supply voltage supplied to said main current path, whereby said first ripple and said second ripple have opposite signs and compensate for each other.