RFID design with CRC programmable capability, dual encode functions and dual modulation outputs

In this paper, a CMOS chip with programmable capability for cyclic redundancy check (CRC) operation is proposed. By the programmable function, the circuit provides function of CRC-4, CRC-5, CRC-8, or CRC-16. The dual encoding functions including Manchester and Miller codes are also obtained from the circuit. In addition, amplitude-shift keying (ASK) and frequency-shift keying (FSK) modulations are integrated within the chip for more practical applications. These flexible and programmable characteristics are useful for radio frequency identification (RFID). Based on TSMC 0.18-µm CMOS technology, the whole circuit works successfully at 1.8 V, 200 MHz data throughput, and 0.85-mW power consumption by HSPICE post-layout simulation. The supply voltage of the circuit can be further reduced to 0.9 V@100 MHz and 90 µW power consumption.