Patent ID: 7061309
Filing Date: 2006-06-13
Classification: H03F

Abstract:
1. A transconductance-adjusting circuit for adjusting the transconductance of an adjacent primary RC filter by adjusting a voltage bias supplied to the filter, said circuit comprising: a first VI converting circuit for converting a first reference voltage to a first current; a resistor for producing a first voltage corresponding to the first current output from the first VI converting circuit; a second VI converting circuit for outputting a second current corresponding to a potential difference between the first voltage produced by the resistor and a second reference voltage; an IV converting circuit for converting the second current output from the second VI converting circuit to a second voltage; and a feedback loop circuit portion for adjusting the first reference voltage of the first VI converting circuit in proportion to the second voltage output from the IV converting circuit so that said potential difference between the first voltage produced by the resistor and the second reference voltage is substantially 0; wherein the second voltage output from the IV converting circuit is provided as the voltage bias to the adjacent primary RC filter.