A multi-mode 1-V DAC+filter in 65-nm CMOS for reconfigurable (GSM, TD-SCDMA and WCDMA) transmitters

摘要

A 10 bit current-steering DAC and a fourth-order low-pass reconstruction filter are realized in a 65nm CMOS technology to be embedded in multi-standard wireless transmitters. The proposed block meets the specifications of GSM, TD-SCDMA and WCDMA by digitally adjusting the DAC conversion frequency and the low-pass filter cut-off frequency. As result, the power consumption is optimized according to the operation mode and is 2.8mW in GSM and TD-SCDMA modes, 3.6mW in WCDMA mode. For all considered standards, the SFDR is larger than 75dB, which satisfies all specifications of the standard mentioned above.