Circuit arrangement with electronically controllable transfer ch

Details Circuit arrangement with electronically controllable transfer ch Circuit arrangement with electronically controllable transfer ch

1991-05-09

1993-04-27

Mullins, James B.

Amplifiers

Signal feedback

Phase shift means in loop path

330 86, 330282, 330294, H03F 134

Patent

active

052066037

ABSTRACT:
In a circuit arrangement with a electronically controllable transfer characteristic, the input signal is applied to an amplifier with a controllable negative feedback. The amplifier has its output connected to a voltage-divider circuit having a frequency-dependent characteristic. This circuit has a plurality of taps (9 to 13, 31 to 35) which are connected to an inverting input of the amplifier via a first electronically controllable switch (8) and to the output of the arrangement via a second electronically controllable switch (30). The two switches (8, 30) are controlled in a manner so as to influence the Q-factors of different filter curves. Therefore, in order to boost the input signal in a frequency band determined by the frequency-dependent voltage divider, the first switch (8) is set a position such that boosting is effected with the desired frequency bandwidth. Furthermore, the position of the second switch (30) is selected so as to obtain boosting to the desired degree. For attenuating the input signal in the frequency band determined by the frequency-dependent voltage divider, the second switch (30) is set a position such that attenuation is effected with the desired frequency bandwidth, and the first switch (8) is set to such a position as to obtain the desired degree of attenuation.

REFERENCES:
patent: 4439739 (1984-03-01), Kilian et al.

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