An RF transmitter is proposed for 3-5 GHz time-hopping ultra wideband（TH-UWB） wireless applications.The transmitter consists of a 4-GHz oscillator, a switch with a controllable attenuator and an output matching circ...An RF transmitter is proposed for 3-5 GHz time-hopping ultra wideband（TH-UWB） wireless applications.The transmitter consists of a 4-GHz oscillator, a switch with a controllable attenuator and an output matching circuit.Through controlling the low frequency signals with time-hopping pulse position modulation（TH-PPM）, the circuit supplies TH-UWB signals and can directly drive an antenna by a transmission line.The transmitter was implemented in a 0.18-μm CMOS technology;the output amplitude is about 65 mV at a 50 ？ load from a 1.8-V supply, the return loss（S 11） at the output port is less than-10 dB, and the chip size is 0.7 × 0.8 mm2, with a power consumption of 12.3 mW.展开更多
基金supported by the National High Technology Researchand Development Program of China(No.2007AA03Z454)the Scienc Foundation of Guangxi Province, China (No. 0575096)
文摘An RF transmitter is proposed for 3-5 GHz time-hopping ultra wideband（TH-UWB） wireless applications.The transmitter consists of a 4-GHz oscillator, a switch with a controllable attenuator and an output matching circuit.Through controlling the low frequency signals with time-hopping pulse position modulation（TH-PPM）, the circuit supplies TH-UWB signals and can directly drive an antenna by a transmission line.The transmitter was implemented in a 0.18-μm CMOS technology;the output amplitude is about 65 mV at a 50 ？ load from a 1.8-V supply, the return loss（S 11） at the output port is less than-10 dB, and the chip size is 0.7 × 0.8 mm2, with a power consumption of 12.3 mW.
