High frequency multi-range attenuator having a high input impeda

Electricity: measuring and testing – Measuring – testing – or sensing electricity – per se – With coupling means

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324 725, 324115, 324121R, 324123C, 330 51, 330124R, 330125, H03F 368, G01R 1322, G01R 1508

Patent

active

048334006

ABSTRACT:
Attenuator having a high input impedance and several switching levels for high frequencies and oscilloscope and active probe comprising such an attenuator. A high frequency attenuator (15) having a high input impedance and several switching stages intended to attenuate a high-frequency electric signal introduced at an input terminal (10) of the attenuator. The attenuator supplies at a low-impedance output terminal (11) an output signal corresponding to the attenuated input signal. The attenuator comprises k broadband amplifiers A.sub.n (1.ltoreq.n.ltoreq.k) having a very small input capacitance, capacitances D.sub.n arranged between each input and each output of each amplifier, and capacitances C.sub.n arranged between each input of each amplifier and the input terminal of the attenuator. The accurate attenuation switching levels are obtained by using different ratios C.sub.n /D.sub.n to produce approximated switching levels which can be transformed to accurate switching levels by a low-impedance amplifier having a variable amplification. This attenuator may be used in oscilloscopes.

REFERENCES:
patent: 4387345 (1983-06-01), Kelley
patent: 4403183 (1983-09-01), Lueker
patent: 4403195 (1983-09-01), Wurzburg
patent: 4525688 (1985-06-01), Murphy et al.
patent: 4555668 (1985-11-01), Gregorian et al.
patent: 4584558 (1986-04-01), Maschek et al.
patent: 4598252 (1986-07-01), Andrices

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