| Summary: | 碩士 === 國立東華大學 === 電機工程學系 === 100 === The radio frequency (RF) front-ends in CMOS for Ultra-wideband (UWB) communication system transceiver are presented in this thesis. This RF front-end circuit operating from 3.1 to 10.6GHz for UWB is investigated and implemented. The proposed RF front-end includes three sub-circuits, which are a low noise amplifier (LNA), a transmitter/receiver (T/R) switch and a power amplifier (PA). The three sub-circuits of RF transceiver for UWB are integrated in a single chip. The LNA utilizes a current-reused technique to save power. The common-gate input stage is used to achieve the performance of input matching for broadband wireless system. Consequently, the T/R switch employs the structure of the single pole double throw (SPDT). A body-floating technique is added to increase the linearity. Finally, the PA uses the architecture of two-stage. The first stage adds suitable feedback components to improve the stability. The second stage can help to increase the linearity. The novel RF front-end was simulated a standard TSMC 0.18-μm CMOS process and was fabricated through Chip Implementation Center (CIC). The front-end chip was measured on-wafer using high frequency probes with on-chip DC blocking capacitors and bypass capacitors.
The proposed LNA is designed for UWB (3.1 to 10.6GHz). The simulation result shows the gain (S21) is 9.3 to 19.6dB, and the minimum NF is 3.85 to 4.85dB. The simulation results of the input return loss (S11) and the output return loss (S22) are both below -10dB. As a result of simulation, the input third order intercept point (IIP3) is -7dBm at 6.5GHz, and the 1dB gain compression point (P1dB) is -12dBm. The power consumption is 21.4mW at a supply voltage of 1.5V and the frequency range of 3.1 to 10.6GHz.
The proposed T/R switch is designed for UWB from 3.1 to 10.6GHz, and represents as a transmitter and a receiver for TX-mode and RX _mode, respectively. As a result of RX-mode simulation, the port of input S11 is less than -10.4dB, the port of output S22 is less than -11.3dB. The RX of port S33 is less than -14.8dB. The simulation result of insertion loss is higher than -3dB, isolation is less than -24.3dB, and P1dB is 12 to 13dBm. As a result of TX-mode simulation, the port of input (S11) is less than -18.8dB, the port of output (S22) is less than -19.5dB. The TX of port (S33) is less than -17.6dB. The simulation result of insertion loss is higher than -1.6dB, isolation is less than -23dB, and P1dB is 17dBm.
The proposed PA is designed for WiMAX (3.5GHz) and UWB (3.1 to 10.6GHz). As for PA with WiMAX, the measurement of the S21 is 1.7 dB. The measurement of S11 and S22 are both well below -10 dB. As a result of measured, the OIP3 is 16.2 dBm and the OP1dB is 9.3 dBm, the power consumption is 112 mW at a supply voltage of 1.8V, and the power added efficiency (PAE) is 2.88 %. As for PA with UWB, the simulation of the S21 is 6.5 to 28.8 dB. The simulation of S11 and S22 are both well below -10 dB. As a result of simulation, the OIP3 is 20.8 dBm at 6 GHz and the OP1dB is 12.2 dBm at 6 GHz, and the PAE is 11.1 to 30.5% for the frequency range of 3.1 to 10.6GHz.
The proposed RF frond-end consists of a LNA, a T/R switch and a PA for UWB. As a result shows the measured result of TX-mode including a T/R switch and a PA. The S21 is -14.9 to 18dB. The port of input S33 is less than -10.1dB and the port of output S11 is less than -5.8dB. OP1dB is 6.2 dBm at 3 GHz. OIP3 is 15 dBm at 3 GHz. PAE is 28.6%. As a result shows the measured result of RX-mode including a T/R switch and a LNA. The S21 is -0.4 to 14.8 dB. The port of input S11 is less than -11.4 dB. The port of output S22 is less than -15.4 dB. The NF is 5.5 to 10.3 dB. IIP3 is 2 dBm at 6GHz. The voltage supply is 1.5V and 1.8V. Power consumption is 21.4 mW and 62.1 mW for the RX-mode and the TX-mode, respectively.
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