A Fully-Integrated, Short-Range, Low Data Rate FM-UWB Transmitter in 90 nm CMOS

A Low-Power Low-Complexity Transmitter for FM-UWB Systems

“…The on-chip pseudo random bit source (PRBS) with a bit length of 2 27 -1 provides the transmitted data under DR of 12.5 kb/s. This work focuses on the proposed transmitter architecture, which is different from the existing transmitter configurations [4,5,7,[9][10][11][12][13][14]. From similarity degree, this work is close to [9].…”

“…The frequency modulated UWB (FM-UWB) system generates a constant-envelope UWB signal with wideband frequency modulation (FM), featuring a flat inband power spectral density (PSD) and a steep spectral roll off to enable a well-defined RF bandwidth [4][5][6][7][8][9][10][11][12][13][14]. Fig.…”

“…The FM-UWB receiver can perform FM demodulation without a local oscillator (LO) or carrier synchronization, which makes the system simplified [4][5][6]. Besides, the antenna design of the FM-UWB system is simple because of a well-controlled RF spectrum and avoiding a high peakto-average transmit power ratio [7].…”

“…The existing regenerative receiver [6] and low-complexity transmitter [7] achieve low power consumption but tend to be sensitive to circuit parameter variation or are considered not as robust as the conventional FM-UWB system. The existing receiver [8] with dual band-pass filters (BPFs) is difficult to make the BPF center frequency accurately tuned under wide frequency ranges.…”

High-Robust Relaxation Oscillator with Frequency Synthesis Feature for FM-UWB Transmitters

“…FSK-modulated triangular subcarrier generation where triangular frequency f 1 represents data "0" and f 2 represents data "1"; followed by RF frequency modulation (FM) where the triangular amplitude voltage converted to UWB FM signal by using an RF voltagecontrolled oscillator (VCO) with carrier frequency f C calibrated [1,2]. Hence, an oscillator having 2-FSK modulated triangular waveform output is indispensable.…”