Abstract: A linear amplifier circuit comprising a first differential amplifier (DA1) having a differential input terminals (I+, I?) for receiving a binary input signal, and a differential output terminals (O+,O?), a second differential amplifier (DA2) having input terminals coupled to the differential input terminals (I+, I?). The amplifier further comprises, a third differential amplifier (DA3) coupled in cascade to the second differential amplifier (DA2) and having its output cross-coupled to the differential output terminals in a feedforward connection, and a capacitor (C) coupled to the third differential amplifier (DA3) for determining an increase of a bandwidth of the linear amplifier, a current flowing through the capacitor (C) being proportional with a derivative of the differential input signal (I+, I?).

Abstract: By using ICs with combined inputs for the VHF-high bandpass circuit and the UHF bandpass circuit, undesirable resonances occur which are caused by one of the tuned circuits. The problem is solved by providing a switching means for decoupling the UHF bandpass circuit from the combined inputs when a VHF-high band signal is received by the VHF-high bandpass circuit. The switching means comprises a switch coupled between the UHF bandpass circuit and the common inputs.