Filter arrangement having a transconductance circuit

Details Filter arrangement having a transconductance circuit Filter arrangement having a transconductance circuit

1987-03-31

1988-10-25

Wan, Gene

Amplifiers

With semiconductor amplifying device

Including signal feedback means

330303, H03F 138

Patent

active

047806907

ABSTRACT:
In a filter arrangement having a transconductance circuit, a first capacitor is arranged between the inverting output and the non-inverting input of a balanced amplifier and a second capacitor is arranged between the non-inverting output and the inverting input. The outputs of a transconductance circuit (transconductor) are connected to the non-inverting input and the inverting input, which transconductor converts a balanced input voltage applied to the inputs into a balanced output current, its transconductance being variable by means of a variable current source. Further, the transconductor is loaded by a load circuit comprising a first current-source transistor and a second current-source transistor whose common base is connected, via a diode, to the junction point between two resistors arranged between the outputs of the transconductor.

REFERENCES:
patent: 4509019 (1985-04-01), Banu et al.

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