HF A=D converter for TV signals - has each coding stage comprising two specified differential amplifiers

摘要

The high-frequency A/D converter, for e.g. television signals, has each coding stage consisting of a first differential amplifier (V1) receiving the input and a second differential amplifier (V2) coupled to the first's outputs. The negative supply voltage (-U) is applied via a T-network of resistors to the emitters of the first amplifier's transistors and via two series resistors to the emitters of the second amplifier's transistors. The junction between the two series resistors provides the analog output (Ua) for the next coding stage.