Abstract: In a receiver for digital symbols, an input signal received by a tuner is passed via a SAW filter and a controllable amplifier to an input of a demodulator. The output signals (I,Q) of the demodulator are passed via controllable amplifiers to analog to digital converters. In order to avoid the use of a feedback signal from the digital part of the receiver to the analog part it is proposed to use first control means for controlling the output signal of the demodulator and second control means for controlling the output signal of the analog to digital converters. An additional advantage is that both control means can be optimized for their respective environments.

Abstract: In an integrated circuit an effective admittance is adjusted. The adjustment uses an admittance element in combination with a current multiplier circuit. The current multiplier circuit provides current I.sub.p proportional to a reference current I.sub.ref through the admittance element: I.sub.p =.alpha.I.sub.ref. The current I.sub.p flows through a terminal in parallel with the current I.sub.ref through the admittance element. This reduces the effective admittance to ground seen at the terminal. The proportionality coefficient .alpha. is modulated using a control circuit which sets the coefficient .alpha. in a non-linear dependence (a+bM)/(c+dM), or P(M)/Q(M), where P and Q are polynomials, on a control signal M. In this way various electronic parameters which depend non-linearly on the effective admittance can be given a linear dependence on the control signal.