Patent ID: 8362820
Filing Date: 2013-01-29
Classification: H03B

Abstract:
1. A semiconductor integrated circuit configured to obtain, from a signal with a predetermined frequency generated by an oscillator, a signal with a desired frequency different from the predetermined frequency, the semiconductor integrated circuit comprising: a voltage-controlled oscillator configured to generate the signal with the predetermined frequency; a first ½-frequency divider circuit configured to input the signal with the predetermined frequency from the voltage-controlled oscillator, to carry out ½ division on the signal, and output a first signal and a second signal which are phase orthogonalized to each other; a second ½-frequency divider circuit configured to input one of the first signal and second signal which are phase orthogonalized to each other and outputted from the first ½-frequency divider circuit, to further carry out ½ frequency division on the signal, and output a third signal and fourth signal which are phase orthogonalized to each other; a mixer circuit unit configured to input and mix the first and second signals and the third and fourth signals to generate a signal with a frequency twice as high as the desired frequency, and output the signal from a predetermined output channel; and a ½-frequency divider unit including an input channel directly connected to the predetermined output channel of the mixer circuit unit and configured to input the signal with the frequency twice as high as the desired frequency from the mixer circuit unit through the input channel, and carry out ½-frequency division on the signal to output the signal with the desired frequency, wherein a bias current flows on the predetermined output channel between the ½-frequency divider unit and the mixer circuit unit.