Patent ID: 7034617
Filing Date: 2006-04-25
Classification: H03F,H03G

Abstract:
1. A semiconductor integrated circuit for high frequency power amplifier comprising a semiconductor chip, wherein said semiconductor chip includes thereover: a current detection circuit having a transistor for output detection which receives a signal from a power amplification circuit for amplifying modulated high frequency signals and detects the current of the power amplification circuit; a current-voltage conversion circuit which converts the detection current of the current detection circuit into voltage; an error amplification circuit which compares the voltage obtained by conversion by the current-voltage conversion circuit with an output level instruction signal and outputs a signal corresponding to the difference between them; and a bias generation circuit which supplies bias to said power amplification circuit based on the output of the error amplification circuit, and wherein said error amplification circuit includes: a differential amplification circuit; a first resistance element; a second resistance element; and a capacitive element, the second resistance element and the capacitive element being connected in series in parallel with the first resistance element, and the first resistance element, the second resistance element, and the capacitive element being connected between the output terminal and inverting input terminal of the differential amplification circuit.