Ultra-wideband voltage controlled oscillator with commutable phases for BPSK implementation

Abstract

An ultra-wideband Voltage Controlled Oscillator (VCO) is presented in this paper. The circuit achieves fast startups and stops which allow wideband pulses to be generated. In addition, the VCO allows bipolar modulations as Binary Phase Shift Keying to be implemented without the need of a shaping circuit as a mixer. The proposed VCO has been integrated on a silicon area of 0.003mm 2 in a 65nm CMOS technology operating with a supply voltage of 1.2V. The oscillator output provides large differential oscillations from 2.6GHz to 12.3GHz. Measurement has demonstrated the frequency agility of the proposed VCO which covers the mandatory channels of the low (resp. high) bands centered on 4492.8MHz (resp. 7987.2MHz) defined by the IEEE 802.15.4 standard. The VCO power consumption is about 3.2mW/GHz. By using Current Mode Logic (CML) gates, the power consumption can be reduced to 3.84uW only when the VCO is not running (switch off).

Design of pulse synthesizers for the convergence of IR-UWB solutions

“…Due to the width of the frequency band to address, it is usual to implement two oscillators, one for low band channels and another one for high band channels. However, we demonstrate in [13] that only one VCO designed with a standard 65nm CMOS technology can cover all channels. It is based on a three stages ring oscillator architecture where Current Mode Logic (CML) gates are used instead of usual CMOS gates.…”

Pulse Design Method for Complexity Reduction of IEEE IR-UWB Pulse Synthesizers

“…Although a Hbridge has been already proposed for pulse shaping in UWB applications [2], the presented structure has been modified to allow a digitally control of the pulse envelope. In addition, the H-bridge is here driven by a differential Voltage Controlled ring Oscillator (VCO; detailed in [7]) as shown in Fig. 4.a (instead of a Voltage Controlled Delay Line such as in [2]) in order to allow the generation of high duration pulses as required by the IEEE standards.…”

An Ultra Wideband Survey: Global Regulations and Impulse Radio Research Based on Standards

“…Related to the FCC spectral mask and the IEEE 802.15.4-2015 pulse requirements, in [53] an algorithm is studied and proposed to generate orthogonal pulses to fulfil the above mentioned definitions. One of the latest articles considering pulse generation is [54]. The article presents a differential voltage controlled oscillator which can cover the frequency bands defined by both of the standards.…”