Patent ID: 7119626
Filing Date: 2006-10-10
Classification: H03K

Abstract:
1. An oscillation circuit comprising: a first MOS transistor having a gate connected to a first node and a source connected to a first terminal with a predetermined potential; a second MOS transistor having a gate connected to a second node and a source connected to a second terminal with said predetermined potential; a current supply circuit configured to supply a control current to a third node; a threshold correction circuit configured to supply a correction current to said third node; and a charge-discharge circuit which charges and discharges said first node and said second node alternately by supplying a charge current which is a superposition of said control current and said correction current to said first node and said second node alternately in response to potentials of drains of said first MOS transistor and said second MOS transistor, wherein said threshold correction circuit comprises: a third MOS transistor formed on a same semiconductor substrate as said first MOS transistor and said second MOS transistor; and a correction current supplying circuit configured to supply said correction current to said third node in response to a threshold voltage of said third MOS transistor.