Patent ID: 6028469
Filing Date: 2000-02-22
Classification: H03F

Abstract:
An electric circuit arrangement comprising:a switchable feedback branch which is switchable between a first feedback state, in which the circuit arrangement has a frequency response that is stable with respect to an oscillation tendency, and a second feedback state, in which the circuit arrangement has a frequency response that is unstable with respect to an oscillation tendency;a switchable frequency response compensation circuit which during the first feedback state of the feedback branch can be controlled to a nonfeedback mode and during the second feedback state of the feedback branch is controlled to a feedback mode, and in the feedback mode causes such compensation of the frequency response of the circuit arrangement in the second feedback state that the circuit arrangement in the second feedback state is stable with respect to an oscillation tendency, the frequency response compensation circuit comprising a series connection having a controllable frequency response compensation switch and a frequency response compensation capacitor and is connected between an output of the circuit arrangement and a ground terminal; andan amplifier that is fed back via a switch capacitor circuit having a series connection connected between a signal output and a signal input of the amplifier and including a switch capacitor, a first switch capacitor switch connected between the signal input and the switch capacitor, and a second switch capacitor switch connected between the switch capacitor and the signal output, with the two switch capacitor switches in a first switching state connecting the switch capacitor on both sides to ground and the two switch capacitor switches in a second switching state connecting the switch capacitor in series between the signal input and the signal output of the amplifier, and with the frequency response capacitor being adapted to be rendered non-conducting during the first switching state of the two SC switches and being adapted to be rendered conducting during the second switching state of the SC switches.