Compact 640 μW frequency‐modulated ultra‐wideband transmitter

Abstract

This study reports a frequency-modulated ultra-wideband transmitter optimised for low-power consumption. The chip includes a sub-oscillator tunable from 0.1 to 4 MHz, a radio-frequency oscillator tunable from 3.0 to 4.5 GHz, and an output power amplifier with a matching network. Depending on the channel selected, the measured transmitter consumes between 440 and 640 μW of power to produce −14 dBm continuously to a 50 Ω load. Two power supplies are used to reduce the effect of wasted voltage headroom between circuit blocks. Fabrication is done using the International Business Machines Corporation 130 nm complementary metal-oxide-semiconductor technology on a 1 mm × 1 mm loose die, the circuit occupies 0.2 mm 2 .

Low‐power low data rate FM‐UWB receiver front end

“… Block diagram for FM‐UWB transceiver (a) An FM‐UWB transmitter block diagram, (b) Block diagram for FM‐UWB receiver front end. The constant amplitude input signal is converted to an amplitude modulated signal and the resultant AM signal is passed through an envelope detector [15]…”

“… FM‐UWB transmitter implemented using a sub‐carrier oscillator to modulate an RF oscillator and produce a constant envelope output signal [ 15 ] …”