Patent ID: 9065462
Filing Date: 2015-06-23
Classification: H03M

Abstract:
1. A digital-to-analog conversion circuit comprising: a plurality of first current sources that are weighted depending on lower-order bits of digital input signals and supplied with a first bias voltage; a plurality of second current sources that are weighted depending on higher-order bits of the digital input signals and supplied with a second bias voltage; a reference current source circuit configured to generate the first bias voltage and the second bias voltage based on a first reference current; an output circuit configured to combine currents from the first current sources and currents from the second current sources in accordance with the digital input signals to generate an output current, the currents from the first current sources and the currents from the second current sources being set according to the first reference current; and a correction circuit configured to change the first reference current supplied to the reference current source circuit into a second reference current that is smaller than the first reference current, and adjust the first bias voltage and the second bias voltage based on currents from the first current sources and the second current sources changed according to the second reference current.