BROADBAND ATTENUATOR WITH CONTROLLED TRANSMISSION RATIO

摘要

FIELD: measurement equipment.;SUBSTANCE: invention relates to the field of measurement equipment, electric engineering, radio engineering, communication and may be used in the structure of various interfaces, measurement devices, quick-acting analogue-digital (ADC) and digital-analogue (DAC) converters. The achievement of high-quality parameters is provided in a wide range of variation of transmission ratios AT (K₀), which is determined by the ratio K₀=R₆/(R₆+R₃). This is one of the features of the proposed device, which expands areas of its application, for instance, in broadband digitally controlled attenuators, R-2R voltage dividers of quick-acting analogue-digital converters, etc. A broadband attenuator with a controlled transmission ratio comprises an input (1) and an output (2) of the device, between which the first (3) resistor is connected, a source of reference voltage (4), connected by AC between a common bus (5) and the input of the device (1), the second resistor (6), connected by AC between the output of the device (2) and the common bus (5), a capacitor of a load circuit (7), connected by AC between the output of the device (2) and the common bus (5), a balancing capacitor (8). The output of the device (2) is connected by AC with an input of a non-inverting voltage amplifier (9), between the output of the non-inverting voltage amplifier (9) and the output of the device (2) the balancing capacitor (8) is switched.;EFFECT: considerable expansion of the range of working frequencies of the device and its increased efficiency during operation with pulse signals of high amplitude.;2 cl, 7 dwg