# US 2010/0166104 A1 · Uwb dual burst transmit driver > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2010/0166104 A1 - Document ID: US20100166104A1 - Status: Published application - Kind: A1 - Application number: 12/641,711 - Filed: 2009-12-18 - Published: 2010-07-01 - Earliest claimed: 2008-12-19 - Assignees: Lawrence Livermore National Security, LLC - Inventors: Gregory E. Dallum; Garth C. Pratt; Peter C. Haugen; James M. Zumstein; Mark L. Vigars; Carlos E. Romero - Web page: https://patentgrep.com/patent/US20100166104A1 ## CPC - H04L 25/49: using code conversion at the transmitter; using predistortion; using insertion of idle bits for obtaining a desired frequency spectrum; using three or more amplitude levels {; Baseband coding techniques specific to data transmission systems (spectral shaping H04L25/03828)} - H04L 27/0002: {analog front ends; means for connecting modulators, demodulators or transceivers to a transmission line (duplex arrangements H04L5/143)} - H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M) ## Abstract A dual burst transmitter for ultra-wideband (UWB) communication systems generates a pair of precisely spaced RF bursts from a single trigger event. An input trigger pulse produces two oscillator trigger pulses, an initial pulse and a delayed pulse, in a dual trigger generator. The two oscillator trigger pulses drive a gated RF burst (power output) oscillator. A bias driver circuit gates the RF output oscillator on and off and sets the RF burst packet width. The bias driver also level shifts the drive signal to the level that is required for the RF output device. ## Claims ### Claim 1 An ultra-wideband (UWB) dual burst transmitter, comprising: a trigger pulse initiation circuit actuated by a single input trigger pulse; an initial trigger pulse generator connected to the trigger pulse initiation circuit to generate a first trigger pulse; a delayed trigger pulse generator connected to the trigger pulse initiation circuit to generate a second trigger pulse at a selected delay from the first trigger pulse; a bias driver connected to the initial and delayed trigger pulse generators; and a RF burst oscillator connected to the bias driver and actuated thereby in response to the first and second trigger pulses to generate a pair of RF bursts separated by the selected delay. ### Claim 2 (depends on 1) The transmitter of claim 1, wherein the RF burst oscillator is a GHz frequency oscillator. ### Claim 3 (depends on 1) The transmitter of claim 1, wherein the trigger pulse initiation circuit comprises a flip-flop, wherein the flip-flop provides an actuation signal to the initial and delayed trigger pulse generators upon receiving an input trigger pulse. ### Claim 4 (depends on 3) The transmitter of claim 3, wherein the flip-flop comprises a D flip-flop having its D input connected to an input enable signal, its clock input connected to a trigger signal, and its Q output connected to the initial and delayed trigger pulse generators. ### Claim 5 (depends on 4) The transmitter of claim 4, wherein the flip-flop reset input is connected to the delayed trigger pulse generator to reset the flip-flop after generation of the second trigger pulse. ### Claim 6 (depends on 1) The transmitter of claim 1, wherein the initial trigger pulse generator comprises in series an input RC delay circuit, a first inverter, a differentiator, a second inverter, and a diode. ### Claim 7 (depends on 6) The transmitter of claim 6, wherein the delayed trigger pulse generator comprises in series an input RC delay circuit, a first inverter, a differentiator, a second inverter, and a diode. ### Claim 8 (depends on 7) The transmitter of claim 7, wherein the RC time constant of the input RC delay circuit of the initial trigger pulse generator is small compared to the RC time constant of the input RC delay circuit of the delayed trigger pulse generator. ### Claim 9 (depends on 8) The transmitter of claim 8, wherein the input RC delay circuit of the initial trigger pulse generator comprises a variable resistor, which is adjustable to fine tune the delay between the first and second trigger pulses. ### Claim 10 (depends on 9) The transmitter of claim 9, wherein the inverters in the initial and delayed trigger pulse generators are CMOS inverters. ### Claim 11 (depends on 7) The transmitter of claim 7, wherein the trigger pulse initiation circuit comprises a flip-flop, and further comprising an RC delay circuit connected to the reset input of the flip-flop, wherein the output of the first inverter in the delayed trigger pulse generator is connected to the reset input through the RC delay circuit. ### Claim 12 (depends on 1) The transmitter of claim 1, wherein the RF burst oscillator comprises a RF power transistor, and a Clapp oscillator output stage connected to the output power transistor. ### Claim 13 (depends on 12) The transmitter of claim 12, wherein the RF power transistor is a MESFET having its gate connected to the bias driver and its source to the Clapp oscillator output stage. ### Claim 14 (depends on 1) The transmitter of claim 1, wherein the RF burst oscillator comprises a MESFET having its gate connected to the bias driver; a first capacitor connected from the MESFET gate to ground; a second capacitor, a first inductor, and a second inductor connected in series from the MESFET gate to a voltage supply; the MESFET drain being connected to ground; the MESFET source being connected through the third inductor to the voltage source; a third capacitor connected from the MESFET source to ground, and a fourth capacitor connected from the MESFET source to the RF output. ### Claim 15 (depends on 14) The transmitter of claim 14, wherein the capacitors and inductors are selected to select the RF frequency. ### Claim 16 (depends on 1) The transmitter of claim 1, wherein the bias driver comprises means for gating the RF burst oscillator on and off, means for level shifting the first and second trigger pulses from the initial and delayed trigger pulse generators for input into the RF burst oscillator and means for setting the length of the RF burst. ### Claim 17 (depends on 1) The transmitter of claim 1, wherein the bias driver comprises an inverter, a differentiator connected to the output of the inverter, a parallel pair of level shifted inverters connected to the differentiator, and a buffer inductor connected to the outputs of the inverters. ### Claim 18 (depends on 17) The transmitter of claim 17, further comprising a zener diode connected from a power input of a first of the pair of inverters to the power input of the second of the pair of inverters, and a resistor connected from the power input of the second inverter to ground, the power input of the first inverter being connected to a power source. ### Claim 19 (depends on 1) The transmitter of claim 1, further comprising a transmit antenna connected to the output of the RF burst oscillator. ### Claim 20 A method of generating a precisely spaced pair of ultra-wideband (UWB) RF bursts, each starting with the same phase, from a single input trigger pulse, comprising: generating an actuation signal from the input trigger pulse; passing the actuation signal through two trigger pulse generating paths to produce an initial trigger pulse and a delayed trigger pulse separated by a selected delay from the initial trigger pulse; and driving an oscillator with the initial and delayed trigger pulses to produce a spaced pair of RF bursts, the RF bursts being separated by the selected delay. ### Claim 21 (depends on 20) The method of claim 20, wherein the oscillator produces RF bursts with a frequency in the GHz range. ### Claim 22 (depends on 20) The method of claim 20, further comprising conditioning the initial and delayed trigger pulses before driving the oscillator. ### Claim 23 (depends on 20) The method of claim 20, further comprising coupling the RF bursts to a transmit antenna. ### Claim 24 (depends on 20) The method of claim 20, further comprising generating a reset signal to allow another actuation signal to be generated.