Patent ID: 8106594
Filing Date: 2012-01-31
Classification: H01L,H03K,H03L

Abstract:
1. A semiconductor device comprising: a low potential power supply; a high potential power supply; and a voltage controlled oscillator, the voltage controlled oscillator comprising: a first circuit comprising a first N-type transistor and a first P-type transistor; a second circuit comprising a second N-type transistor; a third circuit comprising a second P-type transistor; and a fourth circuit comprising a third N-type transistor and a third P-type transistor, wherein one of a source and a drain of the first N-type transistor is electrically connected to one of a source and a drain of the first P-type transistor, wherein the other of the source and the drain of the first N-type transistor is electrically connected to one of a source and a drain of the second N-type transistor, wherein the other of the source and the drain of the first P-type transistor is electrically connected to one of a source and a drain of the second P-type transistor, wherein one of a source and a drain of the third N-type transistor is electrically connected to one of a source and a drain of the third P-type transistor, wherein the other of the source and the drain of the second N-type transistor and the other of the source and the drain of the third N-type transistor are electrically connected to the low potential power supply, wherein the other of the source and the drain of the second P-type transistor and the other of the source and the drain of the third P-type transistor are electrically connected to the high potential power supply, wherein a threshold voltage of the second N-type transistor is lower than that of the first N-type transistor, wherein a threshold voltage of the third N-type transistor is lower than that of the first N-type transistor, wherein a first signal is inputted to a gate of the second N-type transistor and a gate of the third N-type transistor, and wherein a second signal is outputted from the one of the source and the drain of the first N-type transistor and the one of the source and the drain of the first P-type transistor.