This inventor holds 4 USPTO granted patents. Top assignee: Thomson-Csf. Active years: 1985-1998.
Location History:
- Paris, FR (1985)
- Domont, FR (1988 - 1998)
Company Filing History:
Years Active: 1985-1998
Title: The Innovations of Andre Roullet
Introduction
Andre Roullet is a notable inventor based in Domont, France. He has made significant contributions to the field of frequency synthesis, holding a total of four patents. His work has advanced the technology used in wideband receivers and microwave synthesizers.
Latest Patents
Roullet's latest patents include a frequency synthesizer for V/UHF wideband receivers. This device features a first frequency synthesizer loop with fractional division, which applies a wide frequency band transposition signal to the input of the first mixing stage of the receiver. Additionally, it includes a second phase-lock frequency synthesizer loop that applies a narrow frequency band transposition signal to the second mixer stage. A common frequency source is coupled to both loops, providing a frequency reference signal for their reference inputs. This innovation is particularly applicable to wideband receivers operating in the range of 20 MHz to GHz. Another significant patent is a microwave synthesizer with fractional division. This synthesizer comprises a voltage-controlled oscillator, a phase-frequency comparator, and a variable-rank frequency divider. The command device controls the oscillation frequency of the voltage-controlled oscillator based on the rank of division of the frequency divider. The phase-frequency comparator circuit generates pulses that adjust the frequency and phase of the oscillator according to the voltage developed at the capacitor terminals.
Career Highlights
Roullet has had a distinguished career at Thomson-CSF, where he has been instrumental in developing advanced technologies in the field of electronics and communications. His expertise in frequency synthesis has positioned him as a key figure in the industry.
Collaborations
Throughout his career, Roullet has collaborated with notable colleagues, including Luc Dartois and Raymond Riboni. These partnerships have fostered innovation and contributed to the success of various projects.
Conclusion
Andre Roullet's contributions to frequency synthesis and his innovative patents have significantly impacted the field of electronics. His work continues to influence advancements in wideband receivers and microwave technology.