DIRECT-CONVERSION TRANSCEIVER WITH DC OFFSET COMPENSATION AND THE OPERATION METHOD USING THE SAME

摘要

The present invention discloses a direct-conversion transceiver with dc offset compensation, and method using the same. The transceiver mainly comprises an antenna, a first filter, a second filter, a third filter, a first variable gain amplifier with multi-stages, a second variable gain amplifier with multi-stages, a first analog-to-digital converter, a second analog-to-digital converter, a first dc offset loop, a second dc offset loop, a first digital-to-analog converter, a second digital-to-analog converter, a third digital-to-analog converter, a fourth digital-to-analog converter, a third mixer, a fourth mixer, a power amplifier, a local oscillator, and a baseband circuit. By using the second filters, the third filter, the first digital-to-analog converter and the second digital-to-analog converter for both in transmitting mode or receiving mode, the numbers of the filter and digital-to-analog converter can be reduced and thus the circuit area of the transceiver can be further miniaturized.