Patent ID: 8736337
Filing Date: 2014-05-27
Classification: H03K,H03L

Abstract:
1. A semiconductor device comprising: a clock oscillation circuit which comprises a voltage current conversion circuit, a frequency-voltage conversion circuit, and an oscillation circuit outputting a clock signal, wherein the voltage-current conversion circuit includes wherein the first resistor-switching section has a first resistor section of which a first end is connected to the first node and a first path-switching section including a first and a second switch connected to the drain of the transistor, wherein the first resistor section includes a first resistor and a first plurality of additional resistors connected in series, wherein the first path-switching section determines whether to supply the reference current to the first resistor and the second resistor-switching section via the first switch or to supply the reference current to the second resistor-switching section via the second switch without feeding the reference current to the first resistor, using a control signal, wherein the negative input part of the operational amplifier is supplied a reference voltage, the positive input part of the operational amplifier is connected to the second end of the first resistor section, and the output part of the operational amplifier is connected to a gate of the transistor, and wherein the frequency-voltage conversion circuit outputs an output voltage to the oscillation circuit according to an output current outputted from the voltage-current conversion circuit and a frequency of the clock signal.