Patent ID: 6909335
Filing Date: 2005-06-21
Classification: H03K

Abstract:
1. An oscillator for a DC-DC converter comprising: a trans-conductance unit calculating a trans-conductance value according to an input voltage, deciding and outputting a current according to the input voltage; a capacitor charged by the current outputted from the trans-conductance unit; and an amp-type Schmitt trigger comparing a voltage charged in the capacitor to a threshold voltage, and outputting a compared value, wherein the trans-conductance unit is constructed to connect a source of a second PMOS transistor and a drain of a first PMOS transistor which a gate of the first PMOS transistor receives a first bias voltage from an inverter, and to connect a source side of a first NMOS transistor and a drain of a second NMOS transistor which a gate of the second NMOS transistor receives a second bias voltage from the inverter.