Patent ID: 7298855
Filing Date: 2007-11-20
Classification: H03F,H03G

Abstract:
1. A volume circuit comprising: a first resistive ladder circuit including ‘k’ lines of first series resistances connected in parallel between an input terminal and an output terminal, wherein ‘k’ is an integer that is not less than 2, and a desired fractional output is extracted from a prescribed point in the ‘k’ lines of the series resistances; a first amplifier for amplifying the desired fractional output extracted from the first resistive ladder circuit, wherein an output terminal of the first amplifier is connected to the output terminal of the first resistive ladder circuit; a second amplifier having a first input terminal connected to a prescribed output-side point of the first resistive ladder circuit and a second input terminal connected to a prescribed input-side point of the first resistive ladder circuit; and a second resistive ladder circuit, including ‘k’ lines of second series resistances connected in parallel, and which is connected in series to the first resistive ladder circuit and is connected to an output terminal of the second amplifier.