A 10-Bit, 600 MS/s Multi-Mode Direct-Sampling DAC-Based Transmitter

A 10-Bit, 600 MS/s Multi-Mode Direct-Sampling DAC-Based Transmitter

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This paper presents a 10-bit, 600 MS/s direct-sampling sub-Nyquist rate DAC-based frequency-agile wideband transmitter for IEEE 802.22 cognitive radio applications in the VHF/UHF TV band (54 – 862 MHz).Multi-mode reconstruction using Gilbert cells, including non-return-to-zero, return-to-complement, and return-to-complement with reset, allows the DAC to utilize the image spectrum in the higher Nyquist zones for wideband direct synthesis.A two-dimensional decoder of the dynamic element matching is applied to reduce the correlated noise to the input signals.

A multi-mode control signal generator uses a samsung a71 price toronto slack borrowing strategy to provide the transmitter’s zero frequency hopping time without interference between the three modes to improve the quality of service of the cognitive radio system.A low-power supply-regulated PLL and a divided-by-2 circuit generates quadrature DAC sampling clock signals of 600 MHz to ensure a SDR of > 70dB.The proposed transmitter is fabricated in 65 nm CMOS within an active area of 0.3 mm2, and it achieves a DNL of 0.

12 LSB, dark as knight horse supplement an INL of 0.25 LSB, an SFDR of > 57 dBc, and IM3 of < −62 dBc in the TV band while consuming 19 mW.