A Low Power Interference Robust IR-UWB Transceiver SoC for WBAN Applications - Ultra-Wideband and 60 GHz Communications for Biomedical Applications - page 37

Fig. 14 Baseband control state machine

state is IDLE (LAST_ST IDLE), the system goes back to IDLE state. On the

other hand, if Trans_complete

=

1, and the previous state is RECEIVER, the system
goes back to RECEIVE state. In RECEIVE state, if the command strobe register
of turning on transmitter is set (STXON

=

= 1), the internal state indicator of receive

completion is on (Receive_complete = 1), and there are valid transmission data in

transmitter FIFO (TFIFO 1), the system goes to TRANSMIT state. On the other

hand, if the command strobe register of switching to IDLE is set (SIDLE

=

= 1), and

the internal state indicator of receive completion is on (Receive_complete = 1), the

system goes back to IDLE state.

Measurement Results

The proposed IR-UWB transceiver SoC has been implemented in a standard 0.18-
μ ×

4 mm as shown in Fig. 15 . The whole
chip is mounted in a QFN80 package and soldered on a PCB board for performance
characterization. Under 1 Mb/s data rate, the transmitter draws an average power
of 0.3 mW and the energy efficiency is maintained at 0.3 nJ/bit up to 10 Mb/s.
The receiver RF/analog blocks consume 42 mW peak power and digital baseband

m CMOS process with a die area of 3