Abstract: In a circuit arrangement for amplifying a television signal, having, arranged between an input (2, 3) and an output (6) , a differential amplifier (1) comprising two emitter-coupled transistors (101, 102), high linearity and stability is obtained in spite of a low supply voltage, a high drive and manufacture in a method which produces transistors with a comparatively low "Early-voltage", by a combination of at least one ohmic resistor (103, 104; 202) arranged in the emitter branch of the transistors (101, 102) and a resistive feedback network (7) for feeding back a signal from the output (6) to the input (2, 3).

Abstract: In a synchronous demodulator for demodulating a carrier signal modulated with a useful signal, the demodulator including a filter circuit (2) for selecting the carrier signal, a limiter (3) for generating an amplitude-limited reference signal from the carrier signal, a phase shifter (4) for shifting the phase of the reference signal through a phase angle of essentially 90.degree. with respect to the carrier signal, and a multiplier (5) for multiplicatively combining the modulated carrier signal with the phase shifted reference signal, a simple arrangement effectively suppresses interference phase modulations, in that a dc mixing product is supplied (via 8) by the multiplier (5) as a measure of the frequency deviation of the carrier signal from the pass frequency of the filter circuit (2) as a control signal to this filter circuit for the purpose of controlling the pass frequency.