Patent ID: 7262650
Filing Date: 2007-08-28
Classification: H03K

Abstract:
1. An amplitude adjusting circuit which adjusts an amplitude level of its output signal in response to an input signal, comprising: a variable current source (I an inverter that has a first conductivity type transistor (M a first source-side current mirror section provided on the source power line side, where of two first source-side transistors whose control electrodes are connected in common, one first source-side transistor (Q a first sink-side current mirror section provided on the sink power line side, where of two first sink-side transistors whose control electrodes are connected in common, one first sink-side transistor (Q a second sink-side current mirror section provided on the sink power line side, where of two second sink-side transistors whose control electrodes are connected in common, one second sink-side transistor (Q a second source-side current mirror section provided on the source power line side, where of two second source-side transistors whose control electrodes are connected in common, one second source-side transistor (Q wherein with the amplitude level of the output signal being adjusted according to the variable current, the respective currents flowing through the one and, other first source-side transistors (Q