Gyrator circuit simulating an inductance and use thereof as a fi

Details Gyrator circuit simulating an inductance and use thereof as a fi Gyrator circuit simulating an inductance and use thereof as a fi

1987-07-24

1989-03-14

Grimm, Siegfried H.

Oscillators

Solid state active element oscillator

Transistors

333215, 331167, H03B 524, H03H 1108

Patent

active

048127850

ABSTRACT:
A gyrator circuit usable in a resonant filter circuit comprises a first and a second transconductance amplifier circuit, A and B, respectively, having opposite conductances, which amplifiers are arranged in parallel between a first terminal a and a second terminal b and comprise a first capacitance C.sub.1 arranged between said first terminal a and an earth terminal m, which gyrator circuit simulates an inductance L.sub.g arranged between said second terminal b and said earth terminal m and comprises means for controlling the quality factor Q of said inductance, characterized in that the first transconductance amplifier circuit A comprises two series-connected inverting amplifier stages P.sub.1 and P.sub.2, in that the second transconductance amplifier circuit B comprises an inverting amplifier stage P.sub.3, and in that the means for controlling the quality factor Q comprise a first means P.sub.5 for influencing the output conductance q.sub.2 of the gyrator and a second means P.sub.6 for influencing the phase shift between the output current and the control voltage of the gyrator.

REFERENCES:
patent: 3643183 (1972-02-01), Geffe
patent: 3715693 (1973-02-01), Fletcher et al.
patent: 3921102 (1975-11-01), Voorman et al.

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